and Development Update Peter McIntosh UKRISTFC Daresbury Laboratory ILCX2021 27 th October 2021 Overview Crab Cavity CC Requirements CC Development Preparations Technical Specifications for CC ID: 1042092
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1. Crab Cavity Introduction, Specifications and Development UpdatePeter McIntosh, UKRI-STFC Daresbury LaboratoryILCX202127th October 2021
2. OverviewCrab Cavity (CC) RequirementsCC Development PreparationsTechnical Specifications for CCThe WP3 Crab Cavity Collaboration TeamILCX CC Session Introduction2
3. ILC Crab Cavity (CC) RequirementsCC system is indispensable for ILC!Luminosity reduced by >80% without CCs!No development progress since TDR (2013).Further development required as CC considered not-matured technology (Nomura Research Institute, Ltd):During the technical preparation period (Pre-Lab), prototype CM should be constructed and tested.ILC RDR parameter, by CAIN simulation3IP
4. ILC Technical Preparation (Pre-Lab)WP3 Crab Cavity SystemAim to produce and test a prototype cryomodule (pCM) system with two CC’s. Necessary to demonstrate synchronized operation with two CC’s in one pCM.If installed 14 m from the IP, the beam-pipe for counter-beam extraction will need to pass through the pCM – no expected de-crabbing required.The cavity, power coupler, tuner and pCM to be designed and developed.A pCM containing the two cavities to be manufactured and assembled.In final year (Pre-Lab), a synchronized operation with two CC’s performed to complete the technical demonstration of the CC system.The collaboration is expected to be formed and the preparation advanced mainly outside of Japan. 4
5. Original CC Scope for Pre-Lab Work packageItemsQuantityWP-3Crab Cavity (CC)for BDS # CC production: 4# CC-CM production: 1Decision of installation location with cryogenics/RF location accelerator tunnel−Design and development of prototype cavity/coupler/tune/CM including beam extraction line−Cavity production, including cavities w/ He tank + mag. shield for CM, high-pressure gas regulation, EP/HT/Clean work, including VT4Coupler production including preparation/RF processing readiness (excluding klystron, baking furnace, clean room)4Tuner production readiness4CM production including High-pressure gas, vacuum vessel, cold-mass, and assembly (cavity-string, coupler/tuner, SCM, etc.)1CM test including harmonized operation with two cavities1CC-CM transport cage and shock damper1CC-CM transport tests1Infrastructure for CC and CM development and test (with each regional responsibility.)−Note: Above assumes preferred CC solution pre-defined for Pre-Lab to start. 5
6. ILC CC Specifications6Parameter250 GeV CoM (Post-TDR)10Hz Upgrade1,21 TeV CoM2Beam Energy (GeV) e-125500Crossing Angle (mrad)14Installation site (m from IP)14RF Repetition Rate (Hz)5104Number of bunches131226252450Bunch Train Length (ms)727961897Bunch Spacing (ns)554366Beam current (mA)5.88.757.6Beam size at CC location (X, Y,Z) (mm,um,um)0.97, 66, 300Beta function at CC location (X, Y) (m,m)23200, 15400Cryomodule installation length (m)3.8Horizontal beam-pipe separation (m)0.197 (centre) ±0.0266 (each end of installation length)Operating Temperature (K)2Crab Cavity SpecificationsCavity Frequency (GHz)3.92.61.33.92.61.3Total Kick Voltage (MV)0.6150.9231.8452.53.77.4Amplitude regulation/cavity (% rms)3.5 (for 2% luminosity drop)Relative RF Phase Jitter (deg rms)0.069Timing Jitter (fs rms)49 (for 2% luminosity drop)Longitudinal impedance threshold (Ohm)CC wake-potential input to BDS wakefield simulationsTrasverse impedance threshold (MOhm/m) (X,Y)48.8, 61.7Cavity field rotation tolerance/cavity (mrad rms)5.2 (for 2% luminosity drop)Beam tilt tolerance (H and V) (mrad rms and urad rms)0.35, 7.4 (for 2% luminosity drop)Minimum CC beam-pipe aperture size (mm)20 (same as FD magnets)Minimum Extraction beam-pipe aperture size (mm)20
7. Formal kick-off of development programme started on 24/11/2020:https://agenda.linearcollider.org/event/8987/Held first preliminary workshop on 18/2/2021:https://agenda.linearcollider.org/event/9090/timetable/#20210218Formally set-up WP3 collaboration team with coordination meetings:1st 24/3/21: https://agenda.linearcollider.org/event/9162/2nd 27/4/21: https://agenda.linearcollider.org/event/9191/3rd 25/5/21: https://agenda.linearcollider.org/event/9224/4th 13/6/21: https://agenda.linearcollider.org/event/9290/5th 15/9/21: https://agenda.linearcollider.org/event/9405/First CC option development workshop to be held on 8/12/21:Event not yet posted on ILC IDT Events.WP3 Crab Cavity Developments7Specifications1st Options Update
8. WP3 Collaboration Team and Programme TodayWP3 Collaborating TeamEurope:CERNLancaster UniversityRoyal Holloway UniversitySTFC Daresbury LaboratoryUSA: BNLFNALJlabODUSLACTRIUMFJapan: KEKCC Programme Today (JST)8More WP3 collaborators welcome!!!21:45Elliptical/RacetrackGraeme Burt (Lancaster University)22:05RF Dipole (RFD)Jean Delayen (ODU/Jlab)22:25Double Quarter Wave (DQW)Silvia Verdu Andres (CERN)22:45Wide Open Waveguide (WOW)Binping Xiao (BNL)23:05Quasi-waveguide Multicell Resonator (QMiR)Andrei Lunin (FNAL)23:25Nest Steps and PlansPeter McIntosh (STFC)23:35Discussion (25 mins)Specifications, Design options, Plans … etc
9. MANY THANKSQuestions?