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