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LHC-CC09, 3rd LHC Crab Cavity Workshop

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160/1-009 (CERN)

160/1-009

CERN

48
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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
Summary Report
Participants
  • Akira Yamamoto
  • Alessandro Variola
  • Andrei Seryi
  • Andrew Butterworth
  • Bruno Vullierme
  • Carlo Pagani
  • Derun Li
  • Edmond Ciapala
  • Elena Shaposhnikova
  • Emmanuel Tsesmelis
  • Eric Prebys
  • Erk Jensen
  • Frank Zimmermann
  • Georg Hoffstaetter
  • Graeme Burt
  • Ilan Ben-Zvi
  • Jean Delayen
  • Jean-Pierre Koutchouk
  • Jim Virdee
  • Joachim Tuckmantel
  • Joel Butler
  • Jorg Wenninger
  • Katsunobu Oide
  • Kenji Hosoyama
  • Kota Nakanishi
  • Laurent Tavian
  • LK Len
  • Mariusz Grecki
  • Marzio Nessi
  • Massimo Giovannozzi
  • Mike Cole
  • Oliver Bruning
  • Olivier Brunner
  • Paolo Pierini
  • Paul Collier
  • Peter McIntosh
  • Philippe Lebrun
  • Ralph Assmann
  • Rama Calaga
  • Ranko Ostojic
  • Riccardo de-Maria
  • Rogelio Tomas
  • Roland Garoby
  • Slava Yakovlev
  • Stefan Simrock
  • Stefano Redaelli
  • Steve Myers
  • Swapan Chattopadhyay
  • Tor Raubenheimer
  • Walter Scandale
  • Wolfram Fischer
  • Yipeng Sun
  • Yoshihiro Funakoshi
  • Zenghai Li
Support
  • Wednesday 16 September
    • Setting The Scene 160/1-009

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      • 1
        Welcome & Overview
      • 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)
        Slides
      • 3
        View from the Experiments
        Experiment upgrade plan, cost, leveling, preferences, material from 2008 workshop
        Speaker: Marzio Nessi (CERN)
        Slides
      • 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?, diagnostics
        Speaker: Yoshihiro Funakoshi (KEK)
        Slides
      • 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)
        Slides
      • 6
        Discussion
    • 10:20
      Coffee Break 160/1-009

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    • Layout & Design 160/1-009

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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 gain
        Speaker: Riccardo de Maria (BNL)
        Slides
      • 8
        Miinimum test scenario: Single Crab Cavity in LHC
        IR4 Crab Cavities: Collimation cleaning efficiency, impact parameters, collimator hierarchy, crab dispersion, dynamic aperture, synchro-betatron resonances
        Speaker: Yipeng Sun (CERN)
        Slides
      • 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 dispersion
        Speaker: Rogelio Tomas (CERN)
        Slides
      • 10
        Crab Cavity Momentum Cleaning
        New idea to use crab cavity for momentum cleaning, conditions for resonant excitation, efficiency of this cleaning efficiency
        Speaker: Yipeng Sun (CERN)
        Slides
      • 11
        Dicussion, Beam Dynamics
        Slides
    • 12:35
      Lunch 160/1-009

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    • Cavity Design 160/1-009

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      • 12
        Impedance & Stability
        Longitudinal and transverse impedance budgets; tolerance on orbit, beam loading effects
        Speaker: Elena Shaposhnikova (CERN)
        Slides
      • 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)
        Slides
      • 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)
        Paper
        Slides
      • 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)
        Slides
      • 16
        Discussion, Cavity Design
    • 16:00
      Coffee Break 160/1-009

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    • Cryomodule Design 160/1-009

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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 transport
        Speaker: Vyacheslav Yakovlev (FNAL)
        Slides
      • 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 designs
        Speaker: Paolo PIERINI (INFN Milano)
        Slides
      • 19
        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)
        Slides
      • 20
        TEM Deflecting Cavity
        New TEM concept, RF design & parameters, physical dimensions compared to conventional cavities, prototyping
        Speaker: Jean Delayen (JLAB)
        Slides
      • 21
        Discussion, Cryomodule
  • Thursday 17 September
    • Crab Cavity Integration 160/1-009

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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 lines
        Speaker: Olivier Brunner (CERN)
        Slides
      • 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 safety
        Speaker: Joachim Tuckmantel (CERN)
        Slides
      • 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 operation
        Speaker: Bruno Vullierme (CERN)
        Slides
      • 25
        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, software
        Speaker: Mariusz Grecki (DESY)
        Slides
      • 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 operation
        Speaker: Yoshihiro Funakoshi (KEK)
        Slides
      • 27
        Discussion, Integration
    • 10:20
      Coffee Break 160/1-009

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    • Cryomodule Construction 160/1-009

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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 selection
        Speakers: Ilan Ben-Zvi (Brookhaven National Laboratory), Michael Cole (Advanced Energy Systems)
        slides
      • 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 performance
        Speaker: Kota Nakanishi (KEK)
        Slides
      • 30
        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 issues
        Speaker: Pierre Maesen (CERN)
        Slides
      • 31
        Discussion, Cryomodule Preparation & Cavity Down selection
    • 12:15
      Lunch 160/1-009

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    • Phase I, Validation 160/1-009

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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, synchronization
        Speaker: Andrew Butterworth (CERN)
        Slides
      • 33
        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)
        Slides
      • 34
        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 & leveling
        Speakers: Dr Ralph Assmann (CERN), Dr Stefano Redaelli (CERN)
        Slides
      • 35
        Discussion, Phase I Commissioning
    • 15:40
      Coffee Break 160/1-009

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    • Phase II, Strategy 160/1-009

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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)
        Slides
      • 37
        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)
        Slides
      • 38
        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 & leveling
        Speaker: Dr Stefano Redaelli (CERN)
        Slides
      • 39
        Discussion, Phase II
  • Friday 18 September
    • Planning & Milestones 160/1-009

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      • 40
        Phase I, Schedule
        Speaker: Edmond Ciapala (CERN)
        Slides
      • 41
        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)
        Slides
      • 42
        KEK Contributions, Funding
        Speaker: Prof. Akira Yamamoto (High Energy Accelerator Research Organization (KEK))
      • 43
        LARP Contributions, Funding
        Speaker: Dr Eric Prebys (Fermilab)
        Slides
      • 44
        EUCARD Contributions, Funding
        Speaker: Peter McIntosh (STFC)
        Slides
      • 45
        Discussion, Schedule
    • 10:15
      Coffee Break 160/1-009

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    • Down Selection 160/1-009

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      • 46
        Down Selection, Discussion
      • 47
        Phase I, Discussion
      • 48
        Phase II, Discussion
    • 12:00
      Lunch 160/1-009

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    • Advisory Board, Closed Session 61/1-007 - Room B

      61/1-007 - Room B

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      • 49
        Session I, Summary
        Speaker: Jean-Pierre Koutchouk (AT/MCS)
        Slides
      • 50
        Session II, Summary
        Speaker: Yoshihiro Funakoshi (KEK)
        Slides
      • 51
        Session III, Summary
        Speaker: Jean Delayen (Thomas Jefferson National Accelerator Facility)
        Slides
      • 52
        Session IV, Summary
        Speaker: Paolo PIERINI (INFN Milano)
        Slides
      • 53
        Session V, Summary
        Speaker: Edmond Ciapala (CERN)
        Slides
    • 15:15
      Coffee Break 160/1-009

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    • Advisory Board, Closed Session 61/1-007 - Room B

      61/1-007 - Room B

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      • 54
        Session VI, Summary
        Speaker: Peter McIntosh (STFC)
        Slides
      • 55
        Session VII, Summary
        Speaker: Dr Massimo Giovannozzi (CERN)
        Slides
      • 56
        Session VIII, Summary
        Speaker: Oliver Bruning (CERN)
        Slides
      • 57
        Session IX, Summary
        Speaker: Paul Collier (CERN)
      • 58
        Discussion
    • Public Close Out 160/1-009

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