WP3 5th Crab Cavity Meeting Summary September 2021
Agenda included updates on CC design progress, BDS wake function simulations, expectations for workshops, and ILCX2021 program discussions. Detailed design specifications, team updates, and preparations for upcoming workshops were also highlighted. The meeting focused on key issues and missing information for review. Registration for ILCX2021 is open for virtual-only sessions in October.
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WP3: 5thCrab Cavity Meeting Peter McIntosh, UKRI-STFC Daresbury Laboratory 15thSeptember 2021
Agenda for Today 1. Update from CC design teams on progress (10mins each group) All Any specifications issues to resolve? 2. Update on BDS wakefunction simulations Okugi-san 3. Expectations for Design Review Workshop in Dec Peter M 4. ILCX2021 programme discussion Peter M 2
1. Design Specifications (v9) 10Hz Recent Spec (After TDR) 1 TeV CoM Spec 2 Parameter Upgrade1,2 Beam Energy (GeV) e- Crossing Angle (mrad) Installation site (m from IP) RF Repetition Rate (Hz) number of bunches Bunch Train Length (ms) Bunch Spacing (ns) Beam current (mA) Operating Temp (K) Cryomodule installation length (m) Horizontal beam-pipe separation (m) 125 500 14 14 5 10 2625 961 4 1312 2450 727 897 554 5.8 366 8.75 7.6 2 ? 3.8 0.1967 (centre) 0.0266 (each end of installation length) Cavity Frequency (GHz) Total Kick Voltage (MV) Amplitude regulation/cavity (% rms) Relative RF Phase Jitter (deg rms) Timing Jitter (fs rms) 3.9 0.615 2.6 0.923 1.3 1.845 3.9 2.5 2.6 3.7 1.3 7.4 3.5 (for 2% luminosity drop) 0.069 49 (for 2% luminosity drop) Missing Parameters Longitudinal impedance threshold (Ohm) Trasverse impedance threshold (MOhm/m) (X,Y) Cavity field rotation tolerance/cavity (mrad rms) Beam tilt tolerance (H and V) (mrad rms and urad rms) Minimum CC beam-pipe aperture size (mm) Minimum Exraction beam-pipe aperture size (mm) Beam size at CC location (X, Y,Z) (mm,um,um) Beta function at CC location (X, Y) (m,m) Multipole effects for CC (May take some time if not already available) 48.8, 61.7 5.2 (for 2% luminosity drop) 0.35, 7.4 (for 2% luminosity drop) 20 (same as FD magnets) 20 0.97, 66, 300 23200, 15400 3
1. Design Team Updates Elliptical G Burt RFD S De Silva/J Delayen DQW R Calaga WOW B Xiao QMiR A Lunin/S Yakovlev (FNAL) Any specifications issues? 4
2. Update on BDS wakefunction simulations 5
WP3 Workshop Review Dec 7th 3. Updates from Crab Cavity design teams: Cavity performance geometric and impedances/wakefields Couplers and HOMs? Expected options to review: Elliptical - G Burt (ULAN) RFD S De Silva/J Delayen (ODU/JLab) DQW B Xiao/R Calaga (BNL/CERN) QMiR A Lunin/S Yakovlev (FNAL) Review Specifications: Identify any key issues and/or missing information. Preparations for 2nd Workshop Review Jun 21st 2022: All cavity items incl. tuners aiming for a consistent assessment of all CC options cavity, HOMs, couplers, tuners etc 6
4. ILCX2021, 26 29 October 2021 (Virtual-only) Registration is open at: https://agenda.linearcollider.org/event/9211/ 2 proposed RF sessions: Crab Cavities Wed 27th 21:30 23:30 (JST) Cryomodule Design Thur 28th 21:30 23:30 (JST) Proposed Crab Cavity session (2 hours): Introduction, specifications and development update (30m) Cavity Options review (1 hour 15m each group) Next steps and plans (10m) Discussion (20m) Comments/feedback on the above? 7
