LHC-CC09, 3rd LHC Crab Cavity Workshop
→
Europe/Zurich
160/1-009 (CERN)
Frank Zimmermann
(AB/ABP),
Jean-Pierre Koutchouk
(AT/MCS),
Joachim Tuckmantel
(CERN),
Rama Calaga
(BNL),
Rogelio Tomas
(CERN)
Description
Workshop Charge:
1. Down-select a crab-cavity design from the proposed concepts and advance the cryomodule design
2. Review the beam simulation results and operational procedures for prototype tests
3. Establish a strategy for a full crab crossing scheme for the phase-II upgrade of the LHC
Support
Participants
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1
Welcome & Overview
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4
KEK-B Crab Operations & Future PlansExperience, and progress, impedance, transparency, operation, tuning, availability with and w/o crab cavities, ramping of crab cavities with beam present, phase scans, detuning & retuning, what happens in case of a crab rf trip?, diagnosticsSpeaker: Yoshihiro Funakoshi (KEK)
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6
Discussion
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1
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10:20
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9
KEK-B Crab-Experiments for the LHC & Super KEK-BControlled noise experiments with KEK-B crab cavities, dependence of emittance growth and luminosity as a function of noise frequency and amplitude, LHC noise constraints based on simulations and KEK-B measurements, measurement of crab dispersionSpeaker: Rogelio Tomas (CERN)
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12:35
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Discussion, Cavity Design
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16:00
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21
Discussion, Cryomodule
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LHC Integration & RF SystemsCryomodule interfaces, transport, tunnel installation, alignment, high voltage and RF power RF stations, RF valves and vacuum pumps, sensors and monitoring, reference signals, controls and feedback, cooling and ventilation, radiation issues and shielding, hardware safetySpeaker: Joachim Tuckmantel (CERN)
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24
Cryogenics InstallationOperating temperature options, extension of main RF vs. crab specific cryogenic lines, Helium pressure, cryo circuits and controls, safety valves and protection, overall installation effort and time line, heat loads, impact on the LHC during prototype tests and regular operationSpeaker: Bruno Vullierme (CERN)
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KEK-B Instrumentation for Crab Cavity TuningStreak camera and crossing angle measurements, crab cavity amplitude and phase control using closed orbit distortion, orbit offsets at IP and luminosity measurements, orbit control and feedback near crab cavities and other instrumentation used for crab operationSpeaker: Yoshihiro Funakoshi (KEK)
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27
Discussion, Integration
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10:20
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28
Cavity Fabrication & TestingCavity SBIR and time line, engineering design, tooling, procurement, fabrication, e-beam welding, tuning, coupler ports, interfaces, Helium vessel, cavity treatment and testing options, impact based on down selectionSpeakers: Ilan Ben-Zvi (Brookhaven National Laboratory), Michael Cole (Advanced Energy Systems)
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29
Cavity-Coupler Treatment & TestingBuffer chemical polishing and electro-polishing options, baking and high pressure rinsing, clean rooms, vertical test facility for 800 MHz crab cavities, high power RF, instrumentation and high gradient performanceSpeaker: Kota Nakanishi (KEK)
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31
Discussion, Cryomodule Preparation & Cavity Down selection
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28
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12:15
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32
RF CommissioningWarm and cold commissioning, cavity conditioning and powering, low level and high level RF controls, data acquisition systems, phase-amplitude control and RF feedback loops, tuner control, high power RF commissioning and loops, synchronizationSpeaker: Andrew Butterworth (CERN)
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35
Discussion, Phase I Commissioning
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32
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15:40
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39
Discussion, Phase II
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KEK Contributions, FundingSpeaker: Prof. Akira Yamamoto (High Energy Accelerator Research Organization (KEK))
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Discussion, Schedule
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10:15
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Down Selection, Discussion
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47
Phase I, Discussion
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48
Phase II, Discussion
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46
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12:00
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15:15
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57
Session IX, SummarySpeaker: Paul Collier (CERN)
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58
Discussion
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