AFAD2025 (Asian Forum for Accelerators and Detectors）

18 Jun 2025, 01:00 → 20 Jun 2025, 18:00 Asia/Tokyo

Science Campus Hall (Tohoku Univ. Aobayama-campus)

The Asian Forum for Accelerators and Detectors (AFAD) in 2025 will be jointly hosted by Tohoku University and High Energy Accelerator Research Organization (KEK), in Sendai, Japan. AFADs are held annually under the guidance of Asian Committee for Future Accelerators (ACFA) to promote collaboration among universities and research institutes in Asia and Oceania.

The major topics (working groups) of the Forum are:
　WG1: Accelerator and its related technologies for photon science
　WG2: Detector technology development
　WG3: Accelerator technologies for industrial & medical applications
　WG4: Innovative accelerator techniques
　WG5: Accelerator and its related technologies for hadron (neutron) science
　WG6: Network & computing
　WG7: Cryogenics, cryomodule and superconducting technology for accelerators

 

Plenary talks:

"Facilities and Research at the Research Center for Accelerator and Radioisotope Science, Tohoku University"

     Hiroaki Ohnishi (RARiS / Tohoku University)

"Status and prospects of KEK research activities"

     Shoji Asai (KEK)

"Commissioning and first year operation of NanoTerasu accelerator system"

     Nobuyuki Nishimori (QST)

"Status of RAON"

    Yeonsei Chung (IRIS/IBS)

"ILC accelerator status" 

    Hiroshi Sakai (KEK)

"Development and Application of the HEPS Data Software System" 

    Yu Hu (IHEP,CAS)

"Status and plans of the JUNO experiment" 

    Benda Xu (Tsinghua University)

"Toward a Compact Tabletop Free-Electron Laser Driven by Laser Wakefield Acceleration" 

    Zhan Jin (SANKEN, Osaka University)

"The status of the Belle II experiment" 

    Tomoyuki SHIMASAKI (University of Tokyo, IPMU)

"Status and plans of the Hyper-Kamiokande experiment" 

    Ryosuke Akutsu (KEK)

 

Hosted by:

               

Sponsored by:

Sendai Tourism, Convention and International Association

ScandiNova Systems KK

R&K Company Limited

AET, INC.

Bee Beans Technologies Co., Ltd.

                                    

SEIKO EG&G / CAEN.S.ｐ.A.

MITSUBISHI ELECTRIC SYSTEM & SERVICE CO.,LTD.

NIHON KOSHUHA CO.,LTD

KUDO ELECTRIC　CO., LTD.

Tohoku ILC Project Development Center.

CORNES Technologies Ltd.

AFAD2025_A2_yoko_web.pdf

exhibitors_registration_form.docx

Visa Request Form.xlsx

Wednesday, 18 June ¶

09:20 → 11:00 Plenary 1: Plenary session 1¶

09:20 Opening¶

Speaker: Kota NAKANISHI (KEK)

Opening.pptx

09:30 Facilities and Research at the Research Center for Accelerator and Radioisotope Science, Tohoku University¶

Speaker: Hiroaki Ohnishi (RARiS/Tohoku University)

10:00 Development and Application of the HEPS Data Software System¶

The High Energy Photon Source (HEPS) is a new fourth-generation high-energy synchrotron radiation facility, scheduled to become fully operational by the end of 2025. Compared to previous generations, it features significant advancements in brightness and detector performance. In its phase I, HEPS plans to construct 14 beamlines, with an estimated annual experimental data volume exceeding 300 PB. The total data scale is expected to surpass the EB level in a short period. HEPS supports a wide range of experimental techniques, including imaging, diffraction, scattering, and spectroscopy, each with significant differences in data throughput and scale. Meanwhile, the emergence of increasingly complex experimental methods poses unprecedented challenges for data processing.

To address the future EB-scale experimental data processing demands of HEPS, we have developed DAISY (Data Analysis Integrated Software System), a general scientific data processing software framework. DAISY is designed to advance integration, standardization, and high-performance in HEPS experimental data processing. It provides key capabilities, including high-throughput data I/O, multimodal data parsing, and multi-source data access. It supports elastic and distributed heterogeneous computing to accommodate different scales, throughput levels, and low-latency data processing requirements. It also offers a general workflow orchestration system to flexibly adapt to various experimental data processing modes. Additionally, it provides user software integration interfaces and a development environment to facilitate the standardization and integration of methodological algorithms and software across multiple disciplines.

Based on the DAISY framework, we have developed multiple domain-specific scientific applications, covering imaging, diffraction, scattering and spectroscopy, while continuously expanding to more scientific domains. Furthermore, we have optimized key software components and algorithms to significantly improve data processing efficiency. At present, several DAISY-based scientific applications have been successfully deployed on HEPS beamlines, supporting online data processing for users. The remaining applications are scheduled for fully deployment within the year, further strengthening HEPS’s data analysis capabilities.

Speaker: Yu Hu (IHEP, CAS)

Development and Application of the HEPS Data Software system - Yu Hu.pdf

Development and Application of the HEPS Data Software system - Yu Hu.pptx

10:30 Status and plans of the JUNO experiment¶

The Jiangmen Underground Neutrino Observatory (JUNO) is a 20-kiloton liquid scintillator (LS) detector under commissioning in south China. It will precisely measure the oscillation of reactor antineutrinos from two commercial nuclear power plants 53km away, with the goal of determining the neutrino mass ordering and measuring three oscillation parameters to sub-percent precisions. JUNO is now already the world's largest liquid scintillator detector with half of its volume filled, making it one of the best observatories for natural neutrinos from terrestrial, solar, galactic and extragalactic sources. This talk will discuss the construction, commissioning and prospect of JUNO.

Speaker: Benda Xu (Tsinghua University)

11:00 → 11:20 Group photo¶

11:20 → 12:40 Parallel A: WG3¶

11:20 Development of a High Current Tandem Accelerator for BNCT¶

Speaker: Bong-hwan Hong (KIRAMS(Korea Institute of Radiological & Medical Sciences))

WG3-1.pdf

WG3-1.pptx

11:40 Commissioning of a 1.2 MV Cockcroft-Walton DC Power Supply for the 2.4 MeV Proton Electrostatic Tandem Accelerator in the Accelerator-Based BNCT System at KIRAMS¶

Speaker: Chawon Park (Korea Institute of Radiological & Medical Sciences (KIRAMS))

WG3-2.pdf

WG3-2.pptx

12:00 Status of the proton linac for the iBNCT project¶

Speaker: Masaharu Sato (High Energy Accelerator Research Organization)

WG3-3.pdf

WG3-3.pptx

12:20 Accelerator based neutron source VITA for medical and scientific applications¶

Speaker: Sergey Taskaev (Budker Institute of Nuclear Physics)

Talk Taskaev v2.pptx

11:20 → 12:40 Parallel B: WG1¶

School of Engineering CENTER HALL (C01)

11:20 Activities at KEK ATF related to “photon science”¶

The KEK ATF (Accelerator Test Facility) serves as a dedicated testbed for developing beam instrumentation technologies in support of the International Linear Collider (ILC) project. As such, it incorporates a variety of diagnostic tools based on laser systems and photodetection technologies. At the ATF, nanometer-scale beam (nanobeam) technology development is underway using the Final Focus System Test Beamline, with the aim of replicating the beam conditions expected at the ILC. This involves achieving an ultra-compact beam size of 37 nm, corresponding to the 7 nm vertical beam size required for collisions at the ILC, and advancing beam position control at the nanometer scale. To date, a vertical beam size of 41 nm has been attained, alongside the successful implementation of a rapid position feedback system capable of stabilizing the beam at nanometer precision. The ATF2 (1.28 GeV) stands out as a unique facility for this research, featuring a cavity-type beam position monitor (BPM) system with 20 nm resolution and a laser interference fringe beam size monitor (IPBSM) for nanobeam measurement. This report outlines the current status of the KEK ATF facility and highlights recent upgrades and experimental studies carried out within the ATF3 collaboration framework.

Speaker: Alexander ARYSHEV (KEK iCASA)

25_06_18_Aryshev_AFAD25_ATF.pdf

11:40 Stability of 3-GeV Linear Accelerator in NanoTerasu¶

The construction of a 3-GeV linear accelerator as an injector system was completed for a new high-brilliance synchrotron radiation facility, NanoTerasu, in 2023. The synchrotron radiation for user experiment has been provided since 2024 after a beam commissioning. The 3-GeV compact linear accelerator consists of 40-MeV injector system and C-band accelerator. In this presentation, we report on the establishment of beam tuning for RF amplitude and phase. We also report on the beam performance obtained, including beam stability and continuous top-up operation for the storage ring.

Speaker: Koichi Kan (QST)

20250618AFAD2025-oral-2-upload.pdf

12:00 The commissioning of the injection complex for the fourth-generation synchrotron radiation source SKIF (Siberian Circular Photon Source)¶

This report provides an overview of the key stages and technical challenges involved in bringing the injection system into operation, including the electron gun, linear accelerator, and booster synchrotron. The injection complex is critical for achieving the high brightness and stability required by fourth-generation light sources, ensuring efficient top-up injection and minimal beam disturbance.

Speaker: Danila Nikiforov (BINP)

12:20 Status of Delhi Light Source – A Compact FEL-THz facility at IUAC¶

The design of the DLS is based on pre-bunched FEL where a train of electron micro-bunches with a maximum energy of 8 MeV are being injected into a compact Undulator to produce the THz radiation in the range of 0.18 - 3.0 THz. The frequency tuning in this range is planned to be achieved by varying the separation of the laser micro-pulses which strike the photocathode to produce the electron micro-bunches. In order to produce ultra-short laser pulses, an advanced Fibre laser system having energy of a few J has been developed in collaboration with KEK, Japan. The Fibre laser system has been commissioned at IUAC for the production of micro-bunch electron beam from the copper photocathode. The photocathode deposition system developed in collaboration with BNL, USA was also commissioned in the past and recently it has started producing thin films. The RF conditioning of the photocathode gun has been accomplished and the electron energy of > 6 MeV has been produced in routine and the same beam is being injected in to the undulator to check the first lasing of THz radiation. The detail of the facility including its various sub-components and their operational details will be presented.

Speaker: Bhuban Kumar Sahu (Inter University Accelerator Centre , NewDelhi)

11:20 → 12:40 Parallel C: WG7¶

Convener: Huang-Hsiu Tsai (NSRRC)

WG6 Meeting Minutes of AFAD2025.pdf

11:20 Operational Experience of the RAON Superconducting Linac¶

RAON is a heavy-ion accelerator facility designed to produce and utilize Rare Isotope Beams (RIBs) for advanced basic science research in Korea. It features a superconducting linear accelerator (Linac) as its driver for the In-Flight (IF) fragmentation method. Since the initial commissioning phase of the low-energy superconducting Linac, extensive efforts have been made to validate the performance and stability of the system, which consists of a series of quarter-wave and half-wave superconducting resonators operating at cryogenic temperatures.
This talk will present the operational experience gained during beam commissioning campaigns, as well as insights from the cool-down process and operation of the cryogenic systems. The presentation will conclude with future plans for performance upgrades.

Speaker: Yeonsei Chung (IRIS/IBS)

AFAD2025-WG7-operational experience of RAON SCL.pdf

11:40 Overview and status of the cryogenic system for SHINE accelerators¶

Speaker: Jiuce Sun (ShanghaiTech University)

12:00 CSNS-II SRF Cooling Scheme Introduction and Project Development Status¶

Speaker: Mei Li (IHEP)

CSNS-II_SRF_Cooling.pdf

12:20 Operational Experience of the TLS CESR-B Type SRF Module¶

Taiwan Light Source (TLS) is a third-generation synchrotron light source located in Hsinchu, Taiwan, with an electron energy of 1.5 GeV. Since 2005, its RF cavities have been upgraded from two normal-conducting type Doris cavities to a CESR-B type SRF module. As of today, the module has been in operation for nearly 20 years. This report presents statistical records from the past two decades of operation, performance monitoring, and various issues encountered during operation along with their corresponding solutions. The status of the spare SRF module will also be discussed in this report.

Speaker: Chao-Hui Huang (NSRRC)

Talk_AFAD2025.pdf

12:40 → 14:00 Lunch

14:00 → 15:20 Parallel A: WG3¶

14:00 High-energy industrial electron accelerators ILU type¶

Speaker: Aleksandr Bryazgin (Budker Institute of Nuclear Physics)

WG3-5.pptx

14:20 Plan of medical RI production by superconducting accelerator¶

Speaker: Hitoshi Hayano (NovAccel Co. Ltd)

WG3-6.pdf

WG3-6.pptx

14:40 Commercial production of medical radioisotopes using accelerator in radiopharmaceutical company¶

Speaker: Taku Ito (Nihon Medi-Physics Co., Ltd. , Theranostics Manufacturing Technology Center)

WG3-7.pdf

WG3-7.pptx

15:00 Strengthening Australia’s heavy ion accelerator capabilities for research and industry¶

Speaker: Thomas McGoram (Heavy Ion Accelerators)

Tom McGoram - HIA overview AFAD 2025 WG3-8.pdf

Tom McGoram - HIA overview AFAD 2025 WG3-8.pptx

14:00 → 15:20 Parallel B: WG1¶

School of Engineering CENTER HALL (C01)

14:00 Experimental Investigation of Coherent Cherenkov Diffraction Radiation in Super-radiant Regime¶

Speaker: Ekaterina Kidanova (Belgorod National Research University, Belgorod, Russia)

14:20 Status of ChDR experiment at ATF2¶

Charged particles traveling nearby a dielectric material at velocities greater than the speed of light in the medium emit Cherenkov Diffraction Radiation (ChDR). This effect is an interesting candidate for non-invasive longitudinal beam diagnostics due to remarkable characteristics such as a large and narrow emission angle as well as high sensitivity to bunch profile and position. Despite the many experimental observations of this radiation, theoretical models remain inconsistent, and their predictions vary in orders of magnitude. An experimental campaign ongoing at ATF2 aims at an absolute measurement of the incoherent light yield in the visible range. This contribution presents the latest developments of the experimental apparatus, recent results and a discussion on further improvements of the setup.

Speaker: Orson Vermare (CERN)

14:40 High Beam Current Operation of Cryogenic Permanent Magnet Undulators at TPS¶

Speaker: Jui-Che Huang (NSRRC)

14:00 → 15:20 Parallel C: WG7¶

Convener: Kota NAKANISHI (KEK)

WG6 Meeting Minutes of AFAD2025.pdf

14:00 The second cryogenic system project for Taiwan Photon Source¶

The second cryogenic system project for the Taiwan Photon Source (TPS) was initiated to ensure long-term reliability and a continuous supply of liquid helium, particularly during the required maintenance of the cold box. Building upon the success of the first cryogenic system, this second phase aims to provide redundant and scalable cryogenic support. Key objectives of the project include the integration of a new helium liquefaction and distribution system, improvements in system automation and monitoring. The project also addresses operational resilience, allowing for maintenance and upgrades without major interruptions to TPS operations.

Speaker: Huang-Hsiu Tsai (NSRRC)

TPS_2nd_cryogenic_system_project.pdf

14:20 Superconducting Third Harmonic cryomodule development and Operation at SSRF¶

It will report the development of superconducting third harmonic cryomodule and operation with beam at SSRF.

Speaker: HONGTAO HOU (SARI)

14:40 Accelerator and Detector Superconducting magnets developed in BINP: status of works¶

Insertion devices for synchrotron accelerator are being manufactured for SKIF installation. Two superconducting solenoids for BINP detectors are being developed. The status of these works will be presented in the presentation. Major works are focused on insertions devices for the currently built SKIF – new source of synchrotron radiation research. This project demands 5 insertion devices at the start of the operation in 2026 including superconducting wigglers and undulators. Two of these devices were successfully tested, the rest devices will be ready by the end of the 2025. The 7 T indirectly cooled solenoid for the THz radiation experiments is operating since 2024 on the Novosibirsk free-electron laser. New physical results were obtained in these experiments in the research of free induction decay of the NO, HBr and HCN. The development of the superconducting solenoid for the upgrade of the existing CMD-3 detector is going on. The solenoid will have the stored energy about 800 kJ. The work should be finished in 2028. Also, the development of the superconducting solenoid for next generation project of VEPP-6 detector is started, the parameters of the solenoid will be close to the existing solenoid of the KEDR detector.

Speaker: Alexey Bragin (BINP)

15:00 Cryomodul for ILC¶

SRF cavity group at KEK is now manufacturing a ILC type cryomodule which consists of eight SRF 9-cell cavities. Completed cryomodule will be tested at 2K with high power RF in 2027. All of cryomodule components such as cavity, power coupler, frequency tuner, magnetic shield and superconducting magnet are now under preparation. Current status of manufacturing cryomodule at KEK will be presented.

Speaker: Takeshi Dohmae (KEK)

Production_of_cryomodule_at_KEK.pdf

15:20 → 15:40 Break

15:40 → 17:00 Parallel A: WG3¶

15:40 The Heavy Ion Accelerator Facility’s Space Irradiation Beamline (HIAF-SIBL) at the Australian National University¶

Speaker: Peter Linardakis (Australian National University)

WG3-9.pdf

WG3-9.pptx

16:00 Development of a laser ion source using a reproducible solidified gas target¶

Speaker: Jun Hasegawa (Institute of Science Tokyo)

WG3-10.pdf

WG3-10.pptx

16:20 Measurement and evaluation of pulsed gamma-ray dose rate of silicon semiconductor sensor using DIRAMS LINAC electron beam¶

Speaker: Heuijin Lim (Dongnam Institute of Radiological & Medical Sciences)

WG3_11_AFAD2025_DIRAMS_KAERI_v2.pdf

16:40 Ion Optical Design Technique of a Static Gantry System for Carbon-ion Radiotherapy using Genetic Algorithm¶

Speaker: Jiye Qiu (The University of Osaka)

WG3-12.pdf

WG3-12.pptx

15:40 → 17:00 Parallel B: WG2¶

Conveners: Ken SAKASHITA, Yuji ENARI (KEK IPNS)

School of Engineering CENTER HALL (C01)

15:40 Dual LXe/Crystal barrel calorimeter of the CMD-3 detector¶

Speaker: KIRILL MIKHAILOV (BINP)

Dual LXe-Crystal barrel calorimeter of the CMD-3 detector.pdf

16:00 A new large-area Micromegas detector and its readout electronics for AMBER experiment at CERN¶

Speaker: Antonio Amoroso

Talk_AFAD25_amoroso.pdf

16:20 SNSPD Development and Applications: Recent Progress in Taiwan and the CERN DRD5 Initiative¶

Speaker: Hsin-Yeh Wu (National Taiwan University)

AFAD2025_SNSPD.pdf

16:40 COMET Detector System¶

Speaker: Satoshi Mihara (KEK)

AFAD-COMET.pdf

15:40 → 17:00 Parallel C: WG4¶

Convener: MinSup Hur (UNIST)

WG6 Meeting Minutes of AFAD2025.pdf

15:40 High efficient laser-driven ion acceleration via relativistically transparency regime¶

Laser driven ion acceleration scheme has been attracting attention as the alternative to conventional accelerators. Their suitability for applications, such as compact medical accelerators, motivates development of robust acceleration schemes using repetitive ultraintense femtosecond lasers. However, acceleration of the ions to the sufficiently high energies for the applications, such as radiation therapy is not yet achieved for 25 years since the first observation of the high energy proton beam of ~ 60 MeV by high intensity laser pulse interacting with solid density target. By controlling the intrinsic temporal pulse profiles of J-KAREN-P at KPSI and DRACO at HZDR, we experimentally reproduced the energetic light ion acceleration performance (> 60 MeV proton and > 30 MeV/u C6+) from plastic targets using ~10 J of laser energy via an efficient and robust ion acceleration mechanism, where relativistic transparency played a significant role [1]. By maintaining the intrinsic contrast condition of the DRACO-PW system while increasing the on-target energy to ~22 J enable to generate protons with > 100 MeV [2]. Furthermore, the highly charged (Z~45 of Ag and Z~65 of Au) energetic heavy ions (> 20MeV/u of Ag and ~ 10MeV/u of Au) were generated from metal targets with ~10 J of on-target laser energy via the relativistic transparency regime [3]. The dominant ionization mechanisms in the above efficient gold ion acceleration are investigated by the PIC simulation whose validity is confirmed by the many set of experimental observations, such as ion energies/charge states, transmission laser energy, and X-ray spectroscopy. The comprehensive understanding of laser-driven heavy ion acceleration dynamics paves the way to controlling the production of highly charged high-energy heavy-ion beams with PW class high-intensity short-pulse lasers. The ability to accelerate high charge state heavy ions over such small spatial and temporal scales is a significant step towards the realization of a next-generation compact heavy-ion accelerator, enabling exploration at the frontier of nuclear physics and nuclear astrophysics.

Speaker: Mamiko Nishiuchi (QST)

16:00 The introduction of the compact laser-driven proton therapy system at Peking University¶

Laser acceleration is a new kind of acceleration technology, which uses the plasma accelerating particles generated after the interaction of ultra-high power laser and matter. Because the plasma does not have the breakdown problem, the plasma acceleration method can provide an acceleration gradient three orders of magnitude higher than the traditional acceleration method. The use of laser acceleration technology is expected to greatly reduce the scale of high energy accelerator, which is a very promising new acceleration technology. Laser acceleration technology is an international research hot spot, there are many research teams in this area of research, and achieved very meaningful experimental results. Lawrence Berkeley Laboratory in the United States, using laser electron acceleration technology, using 1 cm of discharge capillary, obtained 1 GeV of high-energy electrons. Korea accelerate protons and obtained 93 MeV high energy protons. The application of laser acceleration technology in the field of cancer treatment is an important research content of laser acceleration device in the world. Peking University began to study laser acceleration technology in 2006, and proposed a method of radiation pressure acceleration, which can make more efficient use of laser energy and obtain higher proton energy. In 2017, the first laser accelerator prototype in the world was built, and in 2019, the development of a laser-accelerated proton cancer treatment device was started. The report will introduce the relevant research progress of laser acceleration technology in the field of cancer treatment and other fields.

Speaker: Kedong Wang (Peking University)

16:20 Transitional Solid-State Power Amplifier Design Based on Existing Architecture at NSRRC¶

The Taiwan Photon Source (TPS), operated by the National Synchrotron Radiation Research Center (NSRRC) in Taiwan, has been using Solid-State Power Amplifiers (SSPA) as part of its regular operations since 2023, maintaining a stored beam current of 500 mA. Due to the discontinuation of Ampleon’s BLF578 transistors and the rising need for improved energy efficiency, a new SSPA was developed using the successor transistor, BLF978P. This updated design follows the existing module architecture. To support flexibility and future scalability, both SSPA configurations—with and without circulators—were examined throughout the development process. This study details the performance of these new prototypes.

Speaker: Chao-Hui Huang (NSRRC)

17:00 → 17:30 Break

17:30 → 18:50 Reception¶

Thursday, 19 June ¶

09:00 → 10:30 Plenary 2: Plenary session 2¶

09:00 Status and prospects of KEK research activities¶

Speaker: Shoji Asai (KEK)

AFAD2025asai.pdf

09:30 ILC accelerator status¶

"ILC accelerator status" : The international linear collider (ILC) is a Higgs Factory, where electron-positrons are accelerated by the linear accelerators using Superconducting RF (SRF) cavities to 125 GeV. In 2013, the GDE, an international organization of researchers, already compiled the TDR. It is currently being studied under the International Development Team (IDT). Especially, from 2023, the ILC Technology Network (ITN), specifically under the IDT, will work on the development through international cooperation. This presentation will show an overview of the ILC and the recent developments under the ITN. First, an overview about the latest proposed Higgs factories of more than 250 GeV energy will be given. Second, we introduce the ILC accelerator, including the design, key technologies, accelerator systems. Finally, an detailed ongoing key technology developments, such as SRF cavities, nanobeam, and sources, for ILC project over the next few years will also be presented. We believe that these accelerator developments are not only crucial for ILC development but also for the improvements of future accelerators and various industrial and medical applications. Funding: This work was supported by “MEXT Development of key element technologies to improve the performance of future accelerators Program”, Japan Grant Number JPMXP1423812204

Speaker: Hiroshi Sakai (KEK)

AFAD_ILC_acc_status_sakai_v1.pptx

10:00 Status of RAON¶

RAON is a heavy-ion accelerator facility designed to produce and utilize Rare Isotope Beams (RIBs) for advanced nuclear science research in Korea. RAON is unique in combining both In-Flight (IF) Fragmentation and Isotope Separation On-Line (ISOL) methods to offer a broad range of RIBs for diverse experimental needs. The accelerator complex consists of a superconducting heavy-ion linear accelerator for the IF system and a 70 MeV proton cyclotron as the driver for the ISOL system. Following over a decade of development and construction, successful beam commissioning of the low-energy Linac and initial RIB production using the ISOL system have been carried out.
This talk will present the current operational status of RAON, highlighting recent results from beam commissioning and rare isotope production, along with a brief overview of future plans.

Speaker: Yeonsei Chung (IRIS/IBS)

10:30 → 10:50 Break

10:50 → 12:10 Parallel A: WG2¶

Conveners: Ken SAKASHITA, Yuji ENARI (KEK IPNS)

10:50 The Large High Altitude Air Shower Observatory (LHAASO) and its recent results¶

Speaker: Hao Zhou (Tsung-Dao Lee Institute, Shanghai Jiao Tong University)

1_20250619_HaoZhou.pdf

11:10 Status of J-PARC muon g-2/EDM experiment and development of positron tracking detector¶

Speaker: Takashi Yamanaka (Kyushu University)

g2Detector_AFAD2025_250619.pdf

11:30 Design and production of MPD/Ecal shashlyk detectors¶

Speaker: Linmao Li (Tsinghua University)

3_Design and production of MPD ECal shashlik detectors.pdf

11:50 The monolithic active pixel sensor for the particle detector¶

Speaker: Manabu TOGAWA (KEK)

4_20250619_AFAD2025_MAPS_togawa_upload.pdf

10:50 → 12:10 Parallel B: WG4¶

Convener: Masaki Kando (QST)

School of Engineering CENTER HALL (C01)

10:50 Wake-T as a lightweight simulation tool for investigating plasma-driven THz sources¶

Terahertz radiation is a non-ionising source of radiation falling within the frequency band of 0.1 -10 THz, with applications in medicine, imaging, security, and wireless communications [1]. Unfortunately, the optical and electronic devices conventionally used to generate other radiation bands struggle to output terahertz frequencies. Increasing interest in the beam breakup instability, which utilises the extremely high accelerating gradients of plasma wakefields for compact, tunable electron beam modulation, has led to recent proposals of plasma-based sources of terahertz radiation [2-5]. Numerical simulation is integral to developing plasma-based technologies, however, simulating these systems typically requires computationally heavy particle-in-cell codes, which become prohibitively expensive for sweeping parameter scans, design studies, and machine learning techniques. Wake-T is a lightweight alternative to conventional particle-in-cell codes, able to be run in just minutes on a standard GPU. In this work, we investigate the beam breakup instability as it applies to the generation of terahertz radiation, assessing Wake-T as a tool for conducting sweeping parameter scans and in the preliminary investigations of designing a plasma-driven THz source for the Australian synchrotron. [1] A. Leitenstorfer et al., “The 2023 terahertz science and technology roadmap,” J. Phys. D: Appl. Phys., vol. 56, no. 22, p. 223001, Jun. 2023, doi: 10.1088/1361-6463/acbe4c. [2] H. Zhang, I. V. Konoplev, G. Doucas, and J. Smith, “Concept of a tunable source of coherent THz radiation driven by a plasma modulated electron beam,” Physics of Plasmas, vol. 25, no. 4, p. 043111, Apr. 2018, doi: 10.1063/1.5017551. [3] S. Yang, Q. Zhou, C. Tang, S. Chen, and Y. Xia, “Terahertz Cherenkov radiation induced by a self-modulated electron beam in plasma wakefield,” AIP Advances, vol. 9, no. 2, p. 025025, Feb. 2019, doi: 10.1063/1.5047253. [4] H. Feng et al., “Generation of Tunable 10-mJ-Level Terahertz Pulses through Nonlinear Plasma Wakefield Modulation,” Phys. Rev. Applied, vol. 15, no. 4, p. 044032, Apr. 2021, doi: 10.1103/PhysRevApplied.15.044032. [5] H. Feng, L. Yan, Y. Wu, and W. Huang, “Near-ideal energy modulator for tunable THz pulse generation using sectioned hollow channel plasma system,” Physics of Plasmas, vol. 28, no. 10, p. 103101, Oct. 2021, doi: 10.1063/5.0062371.

Speaker: Theo Williams (James Cook University)

11:10 Compact and High-Gradient Accelerator Development via Dielectric Laser Acceleration¶

Speaker: Kazuyuki Sakaue (The University of Tokyo)

11:30 A novel plasma-based, narrowband THz source for compact, THz-band electron accelerators¶

Recently, electron accelerator in terahertz band has been suggested as a next-generation, compact accelerator [1]. Compared to conventional RF, higher frequency THz wave considerably increases the threshold of field strength for the vacuum breakdown, making much stronger accelerating field gradient available. However, there has been no good enough idea for generation of powerful, narrowband terahertz wave suitable for particle acceleration. Laser-driven plasma can serve as a powerful source of terahertz (THz) radiation. Unlike solid-based materials, which have inherent limitations of material damage, plasma—being in a broken-down state—can sustain extremely strong driving laser pulses. However, efficiently converting laser energy into lower-frequency THz radiation using plasma remains a challenging problem. Most plasma-based THz generation schemes utilize plasma as a reservoir of charge carriers (i.e., electrons). Typically, laser pulses induce a single-pass drift motion of electrons, leading to the emission of low-frequency radiation in the form of a half-cycle or a few-cycle pulse. Approaches such as two-color schemes and coherent transition radiation (CTR) fall into this category. Alternatively, plasma oscillations—specifically, plasma waves—can act as radiation sources. However, since plasma waves typically propagate more slowly than electromagnetic waves in a vacuum, their coupling efficiency is limited. To enhance coupling, methods such as mode conversion, magnetization, and density gradients have been proposed, yielding promising results. In this presentation, I introduce a different approach to utilizing plasma oscillations as a THz source. Instead of generating plasma waves, this method localizes plasma oscillations into harmonic-like oscillators. Electrons oscillating in-phase within a finite-sized plasma oscillator can emit radiation via a multipole antenna mechanism [2]. These localized plasma oscillators enable the generation of narrowband THz radiation with remarkably high efficiency. In an optimized case, a conversion efficiency approaches 1%, with a spectral narrowness of less than 5%, and a high output field strength reaching several GV/m. [1] D. Zhang et al., “Segmented terahertz electron accelerator and manipulator (STEAM)”, Nat. Phys. 12, 336 (2018). [2] M. Kumar et al., “Narrowband Terahertz Emission from a Plasma Oscillator Imbedded in a Plasma Density Gradient”, Phys. Rev. Lett. 134, 015001 (2025).

Speaker: MinSup Hur (UNIST)

11:50 CEPC high power and high efficiency klystrons¶

Speaker: Yunlong Chi (IHEP)

10:50 → 12:10 Parallel C: WG3¶

WG6 Meeting Minutes of AFAD2025.pdf

10:50 Microbeam system designed for Q/A=1/2 K100 heavy-ion cyclotron¶

Speaker: Jong-Won Kim (Institute for Basic Science (IBS))

WG3-13.pdf

WG3-13.ppt

11:10 Precision Microbeam Irradiation: ANSTO Accelerator Capabilities¶

Speaker: Ryan Drury (Australian Nuclear Science and Technology Organisation)

WG3-14.pdf

WG3-14.pptx

11:30 Dosimetry and microdosimetry for neutron beam characterisation of an accelerator-based neutron source designed for clinical boron neutron capture therapy¶

Speaker: Naonori Hu (Osaka Medical and Pharmaceutical University)

WG3-15.pdf

WG3-15.pptx

11:50 DEVELOPMENT AND TESTING OF A DOSIMETRIC PHANTOM CREATED BY FUSED FILAMENT FABRICATION¶

Speaker: Daria Polomoshnova (Tomsk Polytechnic University)

WG3-16_AFAD2025.pptx

10:50 → 12:10 Parallel D: WG5¶

Convener: Takashi Ino (KEK)

10:50 New LEBT with stripped protons removal for superconducting linacs¶

A new low-energy beam transport (LEBT) system with a two-solenoid structure has been designed for the CSNS-II accelerator, which will incorporate a superconducting linac. In addition to its conventional functions, such as differential pumping and RFQ phase matching, this LEBT introduces several advanced features. First, the beamline is tilted by 1.8 degrees upstream of the second solenoid, enabling the removal of stripped protons via a bending magnet. Since most protons are generated before the bending magnet, and those remaining afterward fall outside the RFQ’s acceptance, only ~0.01% of the protons are captured by the RFQ. Second, a newly developed electrostatic chopper is installed directly before the RFQ entrance. Measurements with a Faraday cup confirm that the chopped beam pulses exhibit rise/fall times of less than 10 ns.

Speaker: Weidong Chen (IHEP, CAS)

Chenwd-AFAD-2025.pptx

11:10 Design of High-energy Proton Beamlines and Experimental Station in CSNS-II¶

The high-energy proton beam experimental station (HPES) planned to be constructed in CSNS-II can provide multi-pulse high-energy proton test beam with an extremely low beam intensity, which has important applications in research fields such as advanced detectors, irradiation effects, and proton imaging. This report introduces the design of the proton beamlines and experimental station of HPES.

Speaker: Zhiping Li (CSNS)

11:30 Non-invasive beam profile monitors for the CSNS Accelerator¶

The China Spallation Neutron Source (CSNS) is a major facility for neutron science in China, and is currently operating at an averaged beam power of 170 kW with a beam energy of 1.6 GeV and repetition rate of 25 Hz. In 2024, the CSNS Upgrade project (CSNS-II) was launched aiming to improve the average beam power to 500 kW. In the sequence, a number of new instrumentations will be equipped at the new superconducting linac, RCS and new beamlines. In this talk, we will present an overview of the new diagnostics and the corresponding the high-intensity challenges. We will also report the recent progresses on the non-invasive profile monitors, such as the ionization profile monitor and laser-wire profile monitor, and the novel carbon-nanotube wire.

Speaker: Renjun Yang (IHEP)

Non-invasive beam profile monitors for the CSNS Accelerator-v0.pdf

11:50 Design scheme for the CSNS-II FFAG accelerator¶

In order to facilitate specialized applications involving broad-band white light neutron and muon sources, the China Spallation Neutron Source (CSNS) plans to construct a Fixed-Field Alternating Gradient (FFAG) accelerator. With the 300 MeV injector of the CSNS-II, the FFAG accelerator will increase the beam energy from 300 MeV to 600 MeV and then to bombard a target, thereby generating the requisite copious neutrons for the applications. This paper will provide a comprehensive overview of the physics design of the FFAG accelerator, such as the beam injection and extraction, Lattice, beam dynamics, error correction, beam optics, beam collimation, beam loss control, nonlinear studies, and so on. Finally, a preliminary design proposal for the CSNS-II FFAG accelerator will be present.

Speaker: Mingyang Huang (IHEP, CAS)

AFAD2025-Design scheme of the FFAG accelerator at CSNS_hmy.pdf

12:10 → 13:30 Lunch

https://www.tohoku.ac.jp/map/en/?f=AY_Z07

13:30 → 15:10 Parallel A: WG2¶

Conveners: Ken SAKASHITA, Yuji ENARI (KEK IPNS)

13:30 Sterile neutrino research in the JSNS2 experiment¶

Speaker: Hyeon Woo Park (Chonnam National University)

1_Sterile neutrino research in the JSNS2 experiment (AFAD 2025)_v7.pdf

13:50 Recent progress on cryogenic electronics for measurements on the particle physics¶

Speaker: Ritsuya Hosokawa (Iwate University)

AFAD2025_CryogenicElectronics_19Jun2025.pdf

14:10 Recent Experience in R&D and Construction of HEP Detectors within TIDC¶

Speaker: You-Ying Li

AFAD2025.pdf

14:30 Low-Pressure TPC with GEM readout for Low-Energy Ion Beam Experiments¶

Speaker: Tamara Shakirova (BINP)

4_low-pressure_TPC.pptx

13:30 → 15:10 Parallel B: WG4¶

Convener: Hyung Taek Kim (Advanced Photonics Research Institute, Gwangju Institute of Science and Technology)

School of Engineering CENTER HALL (C01)

13:30 Oscillation damper for misaligned witness in plasma wakefield accelerator¶

If a laser- or particle beam-driven plasma wakefield accelerator operates in the linear or moderately nonlinear regime, injecting an externally produced particle bunch (witness) to be accelerated may encounter an alignment problem. Witness alignment tolerances can be relaxed by using a damper, an additional particle bunch produced by the same injector and propagating at a submillimeter distance ahead of the witness. If misaligned, the damper perturbs the wakefield in such a way that the witness shifts on-axis with no quality loss. This study was supported by RSF grant No. 23-12-00028.

Speaker: Konstantin Lotov (NSU & Budker INP)

13:50 Studies of plasma based accelerators at IHEP¶

Speaker: Ming Zeng (Institute of High Energy Physics, Chinese Academy of Sciences)

14:10 Features of long particle bunch self-modulated in plasma¶

A beam of relativistic charged particles, when entering the plasma, experiences beam-plasma instability. If the beam is long enough, longer than the plasma wavelength, it divides into a train of microbunches, namely, it self-modulates. This process is highly nonlinear, but under certain conditions becomes reproducible. The way the beam self-modulates depends on the parameters of the system, that is, the beam and the plasma. Properties of the microbunches formed in the plasma are strikingly different from those of the beams generated in conventional accelerators, and we created the analytical model to predict them. This study was supported by RSF grant No. 23-12-00028.

Speaker: Vlada Yarygova (Budker Institute of Nuclear Physics, Novosibirsk State University)

14:30 Optical-Field Ionization-Induced Transverse Beam Instabilities in Laser-Plasma Accelerators¶

Laser-plasma accelerators enable compact, high-gradient charged particle acceleration with broad potential applications. Despite significant progress in improving beam quality and control, the stability of accelerated electron beams remains significantly lower than that of the driving laser pulses. In this work, we investigate a previously underappreciated source of transverse beam instability originating from optical-field ionization (OFI), a fundamental mechanism in laser-driven plasma formation. We show that OFI leads to inherently asymmetric initial plasma density profiles, caused by position-dependent electron drift velocities that are highly sensitive to laser polarization, wavelength, pulse duration, and gas species. Using three-dimensional particle-in-cell simulations, we demonstrate that these asymmetries give rise to nonuniform plasma structures and axial magnetic fields, which amplify transverse hosing-like instabilities. Furthermore, we propose and validate a mitigation strategy using pre-ionization of the gas target with a secondary laser pulse, which effectively suppresses the instability by reducing initial plasma asymmetries.

Speaker: Chen-Kang Huang (National Central University)

14:50 The process of laser wakefield accelerators at SIOM¶

Laser Wakefield Acceleration (LWFA) has emerged as a groundbreaking technique capable of achieving ultrahigh acceleration gradients exceeding 100 GV/m, enabling the development of compact, tabletop particle accelerators. The practical application of LWFA critically depends on the generation of high-quality and stable electron beams. In this presentation, we report the latest progress from the Shanghai Institute of Optics and Fine Mechanics (SIOM) in optimizing electron beam quality and stability in LWFA. By engineering tailored plasma density profiles and controlling laser evolution in plasma, we demonstrate precise phase-space manipulation of electron beams, leading to significant improvements in beam properties.

Speaker: Kangnan Jiang (Shanghai Institute of Optics and Fine Mechanics)

13:30 → 15:10 Parallel C: WG6: Network & computing¶

Convener: Go IWAI (KEK)

WG6 Meeting Minutes of AFAD2025.pdf

13:30 WG6: Opening address¶

Speaker: Go IWAI (KEK)

Upload materials by the due timean hour before your session starts (password required)

WG6-opening.pdf

WG6-opening.pptx

Zoom: AFAD2025_C_0619

13:32 KEK status report¶

The KEK Central Computer System (KEKCC) is the KEK's largest-scale computer system. It provides several services, such as Grid and Cloud computing.

Following the procurement policy for the large-scale computer system requested by the government, we have taken a multiple-year contract and replaced the entire system at the end of every contract year. The new system has been in production since September 2024 and will decommission in August 2028.

In this talk, we would like to review the four-year operation and development of the previous system installed in 2020. In addition, we will then show the difference between before and after September 2024, when the new system is in production. We will also describe the ongoing and planned work in the KEKCC.

Speaker: Go IWAI (KEK)

kek-status-report-iwai-WG6-rev3.pdf

kek-status-report-iwai-WG6-rev3.pptx

13:50 Recent Activities and Future Prospects of the ICEPP ATLAS Tier-2 Site¶

The International Center for Elementary Particle Physics (ICEPP) operates a WLCG Tier-2 site providing essential computing resources for the ATLAS experiment. This talk will present the current operational status of the site, including hardware specifications, global network connectivity and recent operational developments. We will also discuss ongoing R&D efforts, in particular those aimed at meeting the computational demands of the High-Luminosity LHC (HL-LHC) era.

Speaker: Masahiko Saito (ICEPP, University of Tokyo)

20250618_AFAD2025.pdf

14:10 Status of Networking and Grid Computing in Taiwan¶

Speaker: Yuan CHAO (National Taiwan University)

ychao_20250618.pdf

14:30 Status of Data Processing for Space Astronomy Satellites at IHEP¶

Space astronomy satellites serve as critical infrastructure in the field of astrophysics, and data processing is one of the most essential processes for conducting scientific research on cosmic evolution, celestial activities, and dark matter. The Institute of High Energy Physics (IHEP) of the Chinese Academy of Sciences has participated in the development and construction of multiple space astronomy satellites, including: Hard X-ray Modulation Telescope (HXMT), Gravitational wave high-energy Electromagnetic Counterpart All-sky Monitor (GECAM), Space Variable Objects Monitor (SVOM) and enhanced X-ray Timing and Polarimetry mission (eXTP). The massive volume and complexity of satellite data poses significant challenges to data processing. This study will present the current capabilities and ongoing initiatives in satellite data processing at IHEP.

Speaker: Shuang Wang (IHEP)

AFAD2025-WG6-WANGSHUANG.pptx

14:50 Cancelled: Data-Driven Modeling for Collider Luminosity Prediction¶

Cancelled due to speaker's absence.

Speaker: Rasim Mamutov (BINP SB RAS)

13:30 → 15:10 Parallel D: WG5¶

Convener: Weidong Chen

13:30 Current Status and Upgrade plan of 100 MeV Proton Linac at KOMAC¶

The 100 MeV Proton Linear Accelerator (Linac) has been in operation at the Korea Multipurpose Accelerator Complex (KOMAC) since 2013. Four beam lines are regularly used to provide proton beam services to users. In addition, the neutron beam line is ready to start user services after pilot operation. In parallel, the energy upgrade of the proton linear accelerator is also planned. The proposed upgrade of the 100 MeV proton linac consists of the 200 MeV linac, beam line and target room, building expansion, and utility upgrade. This paper discusses recent activities and upgrade plans of the KOMAC linac.

Speaker: Seunghyun Lee (KOMAC, KAERI)

2025 afad S Lee_v2 (shortened).pdf

13:50 Overview of the Laser Plasma RF Ion Source (LaPRIS): Principle, Development, and Experimental Progress¶

LaPRIS (Laser Plasma RF Ion Source) is a novel ion source that generates plasma by irradiating pulsed gas with an ultrashort laser pulse. The resulting ions are extracted using a radio-frequency (RF) electric field. Due to the spatiotemporal localization of the laser, ion production occurs only within a brief moment, which may enable high bunching efficiency and low emittance. In this presentation, we introduce the basic principle and structure of LaPRIS, summarize related prior studies, and present simulation results of the extracted ion beam. We also report on the current status of our experimental setup, including the gas delivery system and laser configuration.

Speaker: Shotaro Matsui (Research Center for Nuclear Physics, Osaka University)

14:10 Compact neutron sources in Japan¶

Compact neutron sources are small scale neutron sources driven by accelerators. They are also called as CANS or compact accelerator-based neutron sources. Unlike large scale neutron sources such as spallation neutron sources and nuclear reactor neutron sources, CANS are low-cost, small-sized, and highly flexible. The drawback of CANS is the neutron flux, which can be several orders lower than those of the large neutron sources. However, it can be compensated, to some extent, by specially designing the neutron target structure and/or shortening the distance between the neutron source and the sample position. Although this disadvantage, CANS still have great possibilities. We will show such CANS in Japan that are routinely operated and actively used for various measurements.

Speaker: Takashi INO (KEK)

15:10 → 15:30 Break

15:30 → 17:10 Parallel A: WG2¶

Conveners: Ken SAKASHITA, Yuji ENARI (KEK IPNS)

15:30 Development for a CEPC reference detector¶

Speaker: Yiming Li (Institute of High Energy Physics, CAS)

20250619_CEPC_detector_rTDR.pdf

15:50 Korea's Contributions to the CMS Endcap Timing Layer for the HL-LHC Upgrade¶

Speaker: Chang-Seong Moon (Kyungpook National University)

2025.06.19 AFAD 2025 - Chang-Seong_Moon_v2.pdf

16:10 KOTO Experiment: Searching for the extremely rare decay of neutral kaon.¶

Speaker: Gei Youb Lim

3_AFAD2025-lim.pdf

15:30 → 17:10 Parallel B: WG4¶

Convener: Konstantin Lotov (NSU & Budker INP)

School of Engineering CENTER HALL (C01)

15:30 Development of segmented capillary gas-cell for laser plasma accelerators¶

A segmented capillary gas-cell was developed to control the injection and acceleration for laser wakefield acceleration (LWFA).The design consists of multiple capillary blocks with engineered apertures fed by independent gas lines, creating controlled longitudinal density gradients. The central block features a reduced orifice diameter, establishing a down-gradient pressure profile that forms corresponding plasma density variations upon ionization. Stark broadening measurements of hydrogen emission confirmed the desired density profile Stark broadening measurements of hydrogen emission confirmed the desired density profile formation by discharged capillary gas-cell. LWFA experiments using a 150 TW laser system produced 300 MeV electron beams with improved energy spread and reduced shot-to-shot fluctuations compared to uniform capillaries. This segmented approach demonstrates significant potential for advancing plasma-based acceleration technologies through precise density control.

Speaker: Inhyuk Nam (Ulsan National Institute of Science and Technology (UNIST))

15:50 Investigation of electron beam properties from few-TW LWFA using an N₂–He gas mixture with variable nitrogen doping in a gas cell¶

Focusing few-TW or even sub-TW laser pulses into a sub-mm-long, dense gas cell opens up opportunities for realizing laser wakefield acceleration of electrons with 100-nA-level currents driven by modern high-repetition-rate lasers. Although the use of pure nitrogen in the cell facilitates the routine generation of 10-MeV-scale electron beams, the strong ionization of nitrogen ions toward higher states and the resulting excessively high electron density in the axial region can lead to significant defocusing of the pump pulse, which tends to inhibit LWFA and cause the loss of high-energy electrons. Therefore, this study aims to improve the properties of electron beams from LWFA driven by a 1-TW pulse by varying the nitrogen concentration ratio ρ, ranging from 0% (pure helium) to 5%, in an N₂–He mixture filled into a 400-µm-long gas cell. Compared to the electron beams generated from the pure nitrogen cell, which exhibit pointing fluctuations of 4.5 mrad and 11.9 mrad in the horizontal and vertical directions, respectively, using an N₂–He mixture with a low nitrogen concentration of ρ = 0.5% significantly reduces the pointing fluctuation to 3.8 mrad in both directions. More importantly, this gas mixture facilitates the generation of more high-energy electrons, accompanied by a distinct peak consistently appearing at 10 MeV in the dispersed energy spectra—markedly different from the continuous spectra observed with the pure nitrogen cell. Therefore, introducing an N₂–He mixture with a low nitrogen concentration ratio into a sub-mm gas cell presents a promising approach to further enhance the properties of electron beams from few-TW LWFA, primarily by reducing beam pointing fluctuations and increasing the charge of high-energy electrons.

Speaker: MING-WEI LIN (National Tsing Hua University)

16:10 All-Optical Blast-Wave Control of Laser Wakefield Acceleration in a Near-Critical Plasma¶

We propose a novel method for changing the length of laser wakefield electron acceleration in a gas jet using a cylindrical blast-wave created by a perpendicularly focused nanosecond laser pulse. The shock front modifies the wake significantly and stops interaction between the laser pulse and accelerated electron bunch, allowing one to directly control the interaction length and avoid dephasing. It also improves the electron beam quality through the plasma lensing effect between the two shock fronts. We demonstrated both experimentally and numerically how this approach can be used to form a quasimonoenergetic electron bunch with controlled energy and improved divergence as well as tracking changes in the bunch parameters during acceleration.

Speaker: Ivan Tsymbalov (Institute for Nuclear Research of Russian Academy of Sciences)

16:30 Development of betatron gamma-rays driven by PW laser pulses¶

This study investigates a novel approach to enhancing betatron gamma-ray radiation based on laser wakefield acceleration (LWFA) [1, 2], a compact scheme for generating ultrashort, high-energy photon sources. We report the first experimental realization of a hybrid betatron scheme [3] in which electron acceleration and radiation emission stages are spatially decoupled using a two-stage gas target. In the first stage, relativistic electron beams are generated in a low-density helium gas cell driven by multi-petawatt laser pulses [4]. These beams are subsequently injected into a high-density neon gas jet, where strong transverse oscillations within the high-density plasma medium produce bright betatron gamma-rays with critical photon energies approaching 0.5 MeV and fluxes exceeding 10¹⁰ photons per laser shot. Based on an estimated source size of ~5 μm and a pulse duration of ~25 fs, the corresponding peak brilliance reaches ~5 × 1024 photons/s/mm2/mrad2/0.1% BW at 180 keV, representing one of the highest reported brilliance values in this photon energy range. This source was further applied to high-resolution gamma-ray radiography of dense metallic structures, demonstrating its suitability for advanced non-destructive evaluation, time-resolved imaging, and probing of extreme states of matter. The proposed hybrid scheme represents a significant advancement in laser-driven gamma-ray source generation, offering a scalable pathway toward compact, high-brilliance photon sources for fundamental and applied science. [1] A Félicie and A. G. R. Thomas Plasma, “Applications of laser wakefield accelerator-based light sources”, Phys. Control. Fusion 58 103001 (2016) [2] C. Hojbota et al., “High-energy betatron source driven by a 4-PW laser with applications to non-destructive imaging” The European Physical Journal A 59, 247 (2023). [3] J. Ferri et al. “High-Brilliance Betatron γ -Ray Source Powered by Laser-Accelerated Electrons” Phys. Rev. Lett. 120, 254802 (2018). [4] J. H. Sung et al., “4.2 PW, 20 fs Ti:sapphire laser at 0.1 Hz”, Opt. Lett. 42, 2058 (2017).

Speaker: Hyung Taek Kim (Advanced Photonics Research Institute, Gwangju Institute of Science and Technology)

15:30 → 17:10 Parallel C: WG6: Network & computing¶

Convener: Go IWAI (KEK)

WG6 Meeting Minutes of AFAD2025.pdf

15:30 Efficient Data IO Methods for Advanced Light Sources¶

Advanced light sources produce vast amounts of diverse, multi-modal data annually, with IO bottlenecks increasingly limiting scientific computational efficiency. To overcome this challenge, our approach introduces a threefold solution. First, we develop daisy-io, which has a unified IO interface designed for cross-disciplinary applications, which integrates accelerated data retrieval techniques such as parallel processing and prefetching to optimize access speeds across heterogeneous datasets. Second, we construct a data streaming platform that eliminates disk read/write bottlenecks through real-time data handling. This platform incorporates three core components: a stream ingestion module for dynamic data reception, a stream parsing module for on-the-fly structural processing, and a stream buffering module for temporary data staging. Finally, to further enhance data transmission efficiency, we implement a lightweight serialization protocol and domain-specific compression algorithms, minimizing latency and bandwidth demands. Collectively, these innovations not only accelerate data read/write operations but also abstract complexities arising from disparate data sources and formats, enabling seamless integration into scientific workflows while maintaining adaptability across experimental scenarios.

Speaker: Shiyuan Fu (IHEP, CAS)

AFAD_fusy_0619.pdf

AFAD_fusy_0619.pptx

15:50 The Practice of CI/CD in Advancing the Ecosystem Development of photon Source Software¶

Continuous Integration/Continuous Delivery (CI/CD) can facilitate the development and integration process of advanced photon source software and algorithms. A significant amount of repetitive tasks, such as compiling, testing, deploying, and releasing, may impede the progress of algorithm and software development. Developers often need to expend considerable effort maintaining servers and development environments to ensure the smooth operation of the overall development process. In contrast to professional software developers and maintainers, scientists are more concerned with improving algorithm implementation and integrating scientific software, rather than focusing on the underlying software environment deployment.

This report discusses how to advance the ecosystem of advanced light source software and the latest developments using CI/CD systems, including implemented instances of software and algorithm integration, technical challenges in the ecosystem development of advanced light source software, and future work plans.

Speaker: Jianli Liu (Computing Center, Institute of High Energy Physics, Chinese Academy of Sciences)

AFAD-2025-Liujianli.pptx

16:10 Parallel reconstruction computing on multiple Hygon GPUs for ptychography at HEPS¶

When we try to move the software named ‘Hepsptycho’, which is a ptychography reconstruction program originally based on multiple Nvidia GPU and MPI techs, to run on the Hygon DCU architectures, we found that the reconstructed object and probe encountered an error while the results running on Nvidia GPUs are correct. We profiled the ePIE al-gorithm using NVIDIA Nsight Systems and Hygon's HIP-compatible profiler (Hipprof). Multiple GPUs will communicat and share with each other the object and probe information after the batch or iteration computation completes as slave GPUs send the reconstructed results back to GPU 0 using the Reduce or AllReduce function. Nvidia CUDA toolkit could successfully execute the communication. Hygon DCU 0 encounters a memory corruption error during synchroni-zation, likely due to race conditions when updating the object/probe buffers. We show the profiling results here and how we repair this bug. Here we also show the computational speedup using other HPC techs to get a better recon-struction performance on multi GPUs. This work is implemented within Institute of High Energy Physics (IHEP) DAISY framework.

Speaker: LEI WANG (Institute of High Energy Physics)

AFAD2025-LeiWang.pptx

16:30 Network infrastructure to support NanoTerasu¶

NanoTerasu, a cutting-edge 3 GeV synchrotron launched in 2024, operates 24/7 for a wide range of academic and industrial research. This talk outlines the design and operation of a scalable, stable, and flexible network infrastructure that supports its continuous and reliable operation.

Speaker: Mitsuaki Tsukamoto (National Institutes for Quantum Science and Technology)

AFAD2025_WG6_Tsukamoto.pptx

16:50 JLAN: A backbone network of J-PARC¶

J-PARC (Japan Proton Accelerator Research Complex) is an accelerator-based research facility that provides high-intensity proton beams for a wide range of scientific experiments, including neutrino physics, hadron physics, and materials and life sciences. J-PARC is jointly operated by KEK (High Energy Accelerator Research Organization) and JAEA (Japan Atomic Energy Agency). JLAN is the dedicated network infrastructure for J-PARC, which is designed and operated independently from KEK LAN and JAEA LAN in terms of logical structure and operational policy. One of the key missions of JLAN is to support the reliable transfer of experimental data from J-PARC to KEK Central Computing system, which is located on a separate campus. This presentation reports on the current status of JLAN and IT infrastructure at J-PARC.

Speaker: Tomoe Kishimoto (KEK)

Kishimoto_2025_06_19.pdf

15:30 → 17:10 Parallel D: WG7¶

Convener: Takeshi Dohmae (KEK)

15:30 Development of superconducting insertion devices in SSRF¶

The Shanghai Synchrotron Radiation Facility (SSRF) Science Center is located in the Zhangjiang High-Tech Park in Pudong, Shanghai, and is affiliated with the Shanghai Advanced Research Institute, Chinese Academy of Sciences. The center conducts the construction and operation of the scientific facilities, including the SSRF and the Shanghai Soft X-ray Free Electron Laser Facility (SXFEL), as well as the construction of the Hard X-ray Free Electron Laser Facility, the Shanghai HIgh repetitioN rate XFEL and Extreme light facility (SHINE). Some superconducting insertion devices have been developed in the SSRF center, such superconducting wigglers and undulators for the accelerator-based facilities. In this presentation, the development will be introduced.

Speaker: Zhanguo ZONG (SARI)

20250619-AFAD-zhanguo.zong.pdf

15:50 Numerical simulation and vertical test of conductive cooling superconducting cavity¶

In order to stably and reliably remove the electromagnetic losses of the superconducting cavity through thermal conduction using cryocoolers, numerical simulations and experimental studies were conducted on the cooling structure and RF performance of the conduction-cooled superconducting cavity. Based on the geometric structure and electromagnetic losses of the 1.3 GHz superconducting cavity, various cooling structures were designed, and multiphysics simulation methods were employed to study the effects of the conduction cooling structure schemes, thermal conductive materials, and contact thermal resistance on the heat transfer capacity and superconducting cavity performance. Vertical tests were performed on the conduction-cooled 1.3 GHz Niobium and Nb3Sn superconducting cavities using a cryostat without liquid helium. The test results indicate that the optimized cooling structure has good heat transfer performance, with a slow cooling rate of 0.035 K/min (from 22 K to 7 K) and an average temperature difference across the cavity of 0.2 K. The highest accelerating gradient achieved in the 1.3 GHz Niobium cavity tests was 4.45 MV/m at 6.2E8, with the temperature at the equator being approximately 4.4 K; subsequent temperature increases led to a continuous decrease in Eacc and Q0. The maximum accelerating gradient obtained in the Nb3Sn superconducting cavity tests was 4.4 MV/m at 3E9, with the equatorial temperature around 3.8 K. The research results presented in this paper provide valuable reference for improving the RF performance of conduction-cooled superconducting cavities and designing conduction-cooled superconducting modules.

Speaker: Xiao Liu (IHEP)

16:10 Development of Cryogen-free Conduction-Cooled 5-Tesla Wavelengh Shifter Utilizing High-Temperature Superconducting Technology¶

This work presents the development status of a high-temperature superconducting (HTS) wavelength shifter magnet, a collaborative effort by Pohang Accelerator Laboratory (PAL) and Seoul National University (SNU). The device employs a pure HTS coil system with a conduction-cooled, cryogen-free cryostat, designed to achieve stable operation at 5 T. Following the completion of the vacuum chamber and cooling infrastructure, the magnet successfully demonstrated its target field strength in cold tests after iterative improvements to the coil and thermal insulation. We are currently preparing in-vacuum field measurements and long-term electrical stability tests to validate its suitability for accelerator operation. Beam tests at PLS-II is scheduled to determine whether the device is compatible with accelerator operation, marking an accelerator-based experiment using a fully HTS coil-type insertion device.

Speaker: Garam Hahn (POSTECH)

20250619-HTS_WLS_StatusReport-PAL-SNU-public-v4.pdf

16:30 Conduction cooling research in KEK towards liquid helium free SRF accelerator¶

We are aiming for liquid helium free SRF accelerator by conduction-cooling the Nb3Sn cavity with a cryocooler. The current status of conduction cooling research and findings to date will be presented.

Speaker: Tomohiro Yamada (KEK)

4. 250615_AFAD2025_tyamada_ver3.pdf

18:00 → 20:00 Banquet¶

Friday, 20 June ¶

09:30 → 11:45 Plenary 3: Plenary session 3¶

09:30 Commissioning and first year operation of NanoTerasu accelerator system¶

Speaker: Nobuyuki Nishimori (QST)

10:00 Toward a Compact Tabletop Free-Electron Laser Driven by Laser Wakefield Acceleration¶

To develop a stable laser wakefield acceleration (LWFA)-based accelerator and demonstrate free-electron laser (FEL) generation, a novel LWFA platform was established at the RIKEN SPring-8 Center. Systematic experiments were conducted with support from the ImPACT (2013–2018) and JST MIRAI (2017–present) programs. However, further improvements in electron beam reproducibility, pointing stability, and energy stability are required to meet the demanding requirements of FEL applications. To address these challenges, a shock injection scheme was developed to enable precise injection control and stable plasma formation. This approach led to a substantial improvement in both the stability and reproducibility of the accelerated electron beam. Recent proof-of-concept experiments have demonstrated clear amplification of undulator radiation, indicating the feasibility of LWFA-driven FELs in the XUV regime. This presentation will provide an overview of the LWFA platform, describe the setup of the proof-of-concept experiments with an emphasis on key technological advancements, and discuss the results obtained.

Speaker: Zhan Jin (SANKEN, Osaka University)

10:30 The status of the Belle II experiment¶

Speaker: Tomoyuki SHIMASAKI (University of Tokyo, IPMU)

belleii_status_20250620.pdf

11:00 Status and plans of the Hyper-Kamiokande experiment¶

Speaker: Ryosuke Akutsu (KEK)

11:30 Closing¶

Closing.pptx

11:45 → 12:45 Lunch

12:45 → 16:15 Site visit¶