Mini-workshop on impedance modeling and impedance effects at SuperKEKB and future colliders

15 Dec 2022, 09:00 → 16 Dec 2022, 18:20 Asia/Tokyo

Demin ZHOU (KEK), Takuya ISHIBASHI (KEK)

This topical two-day mini-workshop is a follow-up workshop after the eeFACT2022 for scientists working on various projects to discuss impedance modeling and impedance effects at circular accelerators, including colliders SuperKEKB, FCC-ee, CEPC, EIC, and light sources ESRF, NSLS-II, etc.

The event will take place at KEK, Tsukuba, Japan, from 15 to 16 December 2022 in a hybrid in-person and online participation format.

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Workshop organization committee:

D. Zhou, T. Ishibashi (KEK, Japan)

M. Migliorati (UNIROMA1, Italy)

N. Wang (IHEP, China)

A. Blednykh (BNL, USA)

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Video recordings of the presentations:

https://kds.kek.jp/event/44236/

Thursday, 15 December

09:00 → 12:30 Thursday morning: Morning session 1

Join Zoom Meeting
https://us06web.zoom.us/j/86477803363?pwd=SDlsSVhRZDRKNWRoQW82VXR6cHBkQT09
Meeting ID: 864 7780 3363
Passcode: 969597

Conveners: Alexei Blednykh (BNL), Na Wang (IHEP)

09:00 Opening remark

20221215_Opening_Remark.pdf

09:10 Generalized Nyquist Criterion for Transverse Stability

Speaker: Dr Michael Blaskiewicz (BNL)

nyquist_trans_kek.pdf

09:40 Coupled-bunch instability for arbitrary multibunch configurations

Speaker: Dr Gabriele Bassi (BNL)

Bassi_CBI.pdf

10:10 Impedance modeling and its application to the analysis of the collective effects

Speaker: Dr Alexei Blednykh (BNL)

Impedance_ab.pdf

10:40 Break

10:50 Collimator model & FCC-ee impedance model

Speaker: Dr Mostafa Behtouei (INFN-LNF)

ImpedanceWorkshoKEK_Mostafa_Behtouei.pdf

11:20 Resistive wall impedance and incoherent tune shift for elliptical multilayer beam pipe

Speaker: Yuting Wang (IHEP)

Yuting Wang.pdf

15:00 → 18:10 Thursday afternoon

Join Zoom Meeting
https://us06web.zoom.us/j/86477803363?pwd=SDlsSVhRZDRKNWRoQW82VXR6cHBkQT09
Meeting ID: 864 7780 3363
Passcode: 969597

Conveners: Demin ZHOU (KEK), Takuya ISHIBASHI (KEK)

15:00 Impedance modeling for SuperKEKB

There is a follow-up correction to the old results from T. Ishibashi. See the skb_imp_follow1 file for further details.

Speaker: Takuya ISHIBASHI (KEK)

skb_imp_final.pdf

skb_imp_follow1.pdf

15:30 -1 mode instability at SuperKEKB LER

Speaker: Prof. Kazuhito Ohmi (KEK)

-1modeInstability_ohmi.pdf

16:00 Development and operation experience of collimators at SuperKEKB

Speaker: Shinji Terui (KEK)

impedance workshop(collimator).pdf

16:30 Break

17:10 Optimization of Belle II background and its impact on collimator settings

Speaker: Dr Andrii Natochii ( University of Hawaii)

KEK-Impedance_Workshop_NATOCHII_v2.pdf

17:40 Methods and results of bunch length measurements at SuperKEKB (Canceled)

Speaker: Dr Gaku Mitsuka (KEK)

Friday, 16 December

09:00 → 12:30 Friday morning

Join Zoom Meeting
https://us06web.zoom.us/j/84960326327?pwd=TXE4ejBoM3F1YnlxY0t2T0ljVHAwZz09
Meeting ID: 849 6032 6327
Passcode: 554874

Conveners: Alexei Blednykh (BNL), Na Wang (IHEP)

09:00 Impedance computations and beam-based measurements: A problem of discrepancy

Speaker: Dr Victor Smalyuk (BNL)

Smaluk - Impedance computations and beam-based measurements.pdf

09:30 Beam Induced Heating Analysis for the EIC Vacuum Components

Speaker: Dr Medani Sangroula (BNL)

MSangroula_SKEKB_MiniWorkshop_Dec_2022.pdf

10:00 A cross-check of wakefield simulations by GdfidL and ECHO3D codes

Speaker: Dr Aamna Khan (BNL)

Aamna_KEK.pdf

10:30 Break

10:40 Coupled-bunch instability driven by resistive wall impedance at SuperKEKB main rings

Speaker: Demin ZHOU (KEK)

20221215_TCBI_SKB.pdf

11:10 Fokker-Planck analysis of transverse collective instabilities in electron storage rings (Canceled)

Speaker: Dr Ryan Lindberg (ANL)

15:00 → 18:20 Friday afternoon

Join Zoom Meeting
https://us06web.zoom.us/j/84960326327?pwd=TXE4ejBoM3F1YnlxY0t2T0ljVHAwZz09
Meeting ID: 849 6032 6327
Passcode: 554874

Convener: Mauro Migliorati (Univ. Roma1)

15:00 Interplay of beam-beam and impedance effects

Speaker: Dr Yuan Zhang (IHEP)

2022-12-kek-collective-zhangyuan.pdf

15:30 Impedance modeling and related effects at CEPC

Speaker: Dr Na Wang (IHEP)

Impedance_Workshop_Collective_WangNa.pdf

16:00 FCC-ee collective effects

Speaker: Emanuela Carideo (Univ. Roma1 and CERN)

16_12_22_Emanuela_Carideo.pdf

16:30 Break

16:40 Resistive wall impedance with arbitrary cross section

Speaker: Ali Rajabi (DESY)

Ali_Presentation_VACI_SuperKEKB.pdf

17:10 Collective Effects at the ESRF

Speaker: Lee Carver (ESRF)

CollectiveEffects_at_ESRF.pdf

17:40 Resistive wall impedance calculations using neural network method (Canceled)

Speaker: Dr Kazuhiro Fujita (SIT (Japan))

18:10 Close remark