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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2
LHC Crab Crossing¶Phase 2 and phase 1 as technical step, historical evolution, high luminosity with reduced risk, leveling as a key ingredient , issues addressed in the next sessions (global vs local)Speaker: Dr Frank Zimmermann (AB/ABP)
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3
View from the Experiments¶Experiment upgrade plan, cost, leveling, preferences, material from 2008 workshopSpeaker: Marzio Nessi (CERN)
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4
KEK-B Crab Operations & Future Plans¶Experience, 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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5
Crab Phase I & II Requirements¶Validation, e.g. what do we need to prove prior to installation (outside) and during phase 1 (in situ)? Demonstration requirements?Speaker: Oliver Bruning (CERN)
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Discussion¶
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1
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10:20
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7
Layout, Optics & Operational Scenarios¶Global crab crossing layout, optics for various scenarios (3-7 TeV), beta squeeze, tunability, chromatic effects, imperfections, impact on instrumentation, crab luminosity gainSpeaker: Riccardo de Maria (BNL)
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Miinimum test scenario: Single Crab Cavity in LHC¶IR4 Crab Cavities: Collimation cleaning efficiency, impact parameters, collimator hierarchy, crab dispersion, dynamic aperture, synchro-betatron resonancesSpeaker: Yipeng Sun (CERN)
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9
KEK-B Crab-Experiments for the LHC & Super KEK-B¶Controlled 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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10
Crab Cavity Momentum Cleaning¶New idea to use crab cavity for momentum cleaning, conditions for resonant excitation, efficiency of this cleaning efficiencySpeaker: Yipeng Sun (CERN)
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11
Dicussion, Beam Dynamics¶
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7
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12:35
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12
Impedance & Stability¶Longitudinal and transverse impedance budgets; tolerance on orbit, beam loading effectsSpeaker: Elena Shaposhnikova (CERN)
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13
KEK R&D for LHC¶Cavity-coupler designs, RF characteristics, HOM damping, coupler configurations, mechanical tolerances, tuning, multipacting, cavity treatment, Helium vessel, heat loads, assembly etc...Speaker: Kota Nakanishi (KEK)
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14
LARP R&D for LHC¶Cavity-coupler designs, RF characteristics, HOM damping, coupler configurations, mechanical tolerances, tuning, multipacting, cavity treatment, Helium vessel, heat loads, assembly etc...Speaker: Zenghai Li (SLAC)
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15
UK R&D for LHC¶Cavity-coupler designs, RF characteristics, HOM damping, coupler configurations, mechanical tolerances, tuning, multipacting, cavity treatment, Helium vessel, heat loads, assembly etc...Speaker: Dr Graeme Burt (Cockcroft Institute)
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Discussion, Cavity Design¶
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12
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16:00
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17
Cryostat & Tuner Compatability¶Cryostat conceptual design, cavity-coupler constraints, access ports, vacuum, shielding, cryogenics, mechanical issues, Helium noise and regulation, physical constraints, assembly, testing and transportSpeaker: Vyacheslav Yakovlev (FNAL)
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18
Mechanical & Thermal Issues¶General mechanical and thermal considerations for SRF cryomodules, modeling tools, stress analysis, tuning, alignment, impact of the accelerator environment, issues and input for LHC crab cavity designsSpeaker: Paolo PIERINI (INFN Milano)
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Compact Cavities¶Novel deflecting cavity concepts, physical dimensions and frequency, feasibility for phase II , complexity of design (RF modeling, multipacting, HOM damping, fabrication, treatment, cryostat issues, prototypes)Speaker: Dr Erk Jensen (CERN)
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TEM Deflecting Cavity¶New TEM concept, RF design & parameters, physical dimensions compared to conventional cavities, prototypingSpeaker: Jean Delayen (JLAB)
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Discussion, Cryomodule¶
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17
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22
IP4 Boundary Conditions¶Potential location for crabs in IR4 region, space constraints (longitudinal & transverse) for beam I and beam II, potential locations for cryogenic interfaces, power stations, transmission linesSpeaker: Olivier Brunner (CERN)
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23
LHC Integration & RF Systems¶Cryomodule 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 Installation¶Operating 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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Low Level RF & Feedback¶General noise sources, amplitude and phase stability, tolerances, options for LLRF control, limitations, state of the art, crab specific signals/controls, integration with LHC main RF, testing, softwareSpeaker: Mariusz Grecki (DESY)
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26
KEK-B Instrumentation for Crab Cavity Tuning¶Streak 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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22
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10:20
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28
Cavity Fabrication & Testing¶Cavity 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 & Testing¶Buffer 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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Cryomodule Assembly & Test Stand¶Cryomodule assembly options at CERN, test stand for low power and high power testing, high power RF availability, cryogenics, gradient performance in horizontal cryostat, mechanical and transport issuesSpeaker: Pierre Maesen (CERN)
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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 Commissioning¶Warm 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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Machine Protection¶Machine protection requirements and systems, interlocks and integration of crab cavity, worst case scenario and protection mechanism, safe limits for prototype tests, operational reliability, cavity trips etc..Speaker: Dr Jorg Wenninger (CERN)
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Safe Beam Tests¶IR4 Crab Cavity: Injection-Ramp-Squeeze-Top energy, controls, interface with collimation, orbit control & feedback, cavity failures scenarios, cavity phasing & tuning, luminosity gain & levelingSpeakers: Dr Ralph Assmann (CERN), Dr Stefano Redaelli (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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36
Phase II Scenarios¶Local, global or mixed Crab Cavity schemes? What are the different lattice options and what are the most appropriate, Phase II scenarios to host Crab Cavities.Speaker: Rama Calaga (BNL)
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IR Installation Issues for Phase II¶Considerations to insert Crab Cavities in the IR, space constrains and possibilities of increase the available drift spaces, cryogenic, power and magnet considerations.Speaker: ranko ostojic (CERN)
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Phase II Operations¶Local Crab Cavities: Injection-Ramp-Squeeze-Top energy, controls, interface with collimation, orbit control & feedback, cavity failures scenarios, cavity phasing & tuning, luminosity gain & levelingSpeaker: Dr Stefano Redaelli (CERN)
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Discussion, Phase II¶
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36
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Phase I Cost Estimate & Phase II Projection¶Main cost drivers for the IR4 Crab Cavity insertion. Cost estimates for the first phase of the project and the projections for the second phase.Speaker: Roland Garoby (CERN)
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KEK Contributions, Funding¶Speaker: 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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12:00
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15:15
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