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

Dec 15, 2022, 9:00 AM → Dec 16, 2022, 6:20 PM 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, December 15

9:00 AM → 12:30 PM 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)

9:00 AM Opening remark

20221215_Opening_Remark.pdf

9:10 AM Generalized Nyquist Criterion for Transverse Stability

Speaker: Dr Michael Blaskiewicz (BNL)

nyquist_trans_kek.pdf

9:40 AM Coupled-bunch instability for arbitrary multibunch configurations

Speaker: Dr Gabriele Bassi (BNL)

Bassi_CBI.pdf

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

Speaker: Dr Alexei Blednykh (BNL)

Impedance_ab.pdf

10:40 AM Break

10:50 AM Collimator model & FCC-ee impedance model

Speaker: Dr Mostafa Behtouei (INFN-LNF)

ImpedanceWorkshoKEK_Mostafa_Behtouei.pdf

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

Speaker: Yuting Wang (IHEP)

Yuting Wang.pdf

3:00 PM → 6:10 PM 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)

3:00 PM 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

3:30 PM -1 mode instability at SuperKEKB LER

Speaker: Prof. Kazuhito Ohmi (KEK)

-1modeInstability_ohmi.pdf

4:00 PM Development and operation experience of collimators at SuperKEKB

Speaker: Shinji Terui (KEK)

impedance workshop(collimator).pdf

4:30 PM Break

5:10 PM Optimization of Belle II background and its impact on collimator settings

Speaker: Dr Andrii Natochii ( University of Hawaii)

KEK-Impedance_Workshop_NATOCHII_v2.pdf

5:40 PM Methods and results of bunch length measurements at SuperKEKB (Canceled)

Speaker: Dr Gaku Mitsuka (KEK)

Friday, December 16

9:00 AM → 12:30 PM 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)

9:00 AM Impedance computations and beam-based measurements: A problem of discrepancy

Speaker: Dr Victor Smalyuk (BNL)

Smaluk - Impedance computations and beam-based measurements.pdf

9:30 AM Beam Induced Heating Analysis for the EIC Vacuum Components

Speaker: Dr Medani Sangroula (BNL)

MSangroula_SKEKB_MiniWorkshop_Dec_2022.pdf

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

Speaker: Dr Aamna Khan (BNL)

Aamna_KEK.pdf

10:30 AM Break

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

Speaker: Demin ZHOU (KEK)

20221215_TCBI_SKB.pdf

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

Speaker: Dr Ryan Lindberg (ANL)

3:00 PM → 6:20 PM 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)

3:00 PM Interplay of beam-beam and impedance effects

Speaker: Dr Yuan Zhang (IHEP)

2022-12-kek-collective-zhangyuan.pdf

3:30 PM Impedance modeling and related effects at CEPC

Speaker: Dr Na Wang (IHEP)

Impedance_Workshop_Collective_WangNa.pdf

4:00 PM FCC-ee collective effects

Speaker: Emanuela Carideo (Univ. Roma1 and CERN)

16_12_22_Emanuela_Carideo.pdf

4:30 PM Break

4:40 PM Resistive wall impedance with arbitrary cross section

Speaker: Ali Rajabi (DESY)

Ali_Presentation_VACI_SuperKEKB.pdf

5:10 PM Collective Effects at the ESRF

Speaker: Lee Carver (ESRF)

CollectiveEffects_at_ESRF.pdf

5:40 PM Resistive wall impedance calculations using neural network method (Canceled)

Speaker: Dr Kazuhiro Fujita (SIT (Japan))

6:10 PM Close remark