ILC Vertical Cavity Test Facility - Fermilab

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					ILC Vertical Cavity Test Facility

              C.M. Ginsburg
        Fermilab Technical Division

        All Experimenters’ Meeting
            September 10, 2007
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                        The ILC design today                                        Fermilab




ILC RDR                           ILC Specifications
                                   Initial center-of-mass energy up to 500
                                    GeV, upgradeable to 1 TeV
                                   Ability to scan in energy between 250 and
 e-                         e+      500 GeV
                                   Integrated luminosity in the first four years
                                    500 fb-1 at 500 GeV
                                         Peak luminosity 2 x 1034 cm-2 s-1, 75% duty
                                          factor

          Main Linac
           Two 11-km linacs, one for electrons and one for positrons
           Accelerate from injected energy of 15 GeV to the final beam energy
            of 250 GeV
           ~16000 niobium 1.3 GHz superconducting RF cavities, operating at
            average gradient 31.5 MV/m
           SRF cavities constitute huge portion of total ILC cost
           Reaching 31.5 MV/m reliably is a technical challenge; cavities
            should be qualified at 35 MV/m in a vertical test
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                         Purpose of VCTF                                     Fermilab




   Test cavity quality (Q, Eacc)
        Study cavity production and processing (i.e., S0 goals)
              How to reliably get 35 MV/m in a vertical test, with Q>8E9
        Cavity acceptance test prior to cryomodule assembly
              Does this cavity get 35 MV/m in a vertical test, with Q>8E9
   Develop Fermilab SRF expertise
        Contribute to world effort
        Apply to new projects
   Collaborate with university groups & other labs
   Validate ILC project costs & technical performance




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            From Cavity to Accelerator                                                          Fermilab




Kephart                                                Fail!                       You are
                                                                                   here
     Cavity                      Surface                          Vertical
   Fabrication                  Processing                        Testing
                        Fail!                                                  Pass!
         Horizontal             High-pressure                  Attach He Vessel,
                                 water rinse                    couplers, tuner
          Testing
Pass!




                                                                                    Picture from DESY
       Cold String Assembly


                        aka cryomodule – an accelerator piece
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                 VCTF in Industrial Building 1                       Fermilab




    Existing IB1 cryoplant/infrastructure                  VTS pit
    for Magnet Test Facility (MTF)
   Significant cost savings & faster
    implementation
        Current replacement value ~$10M

   Knowledgeable technical staff
      4 cryogenic magnet test stands              FY06:
       tested 29 superconducting magnets
      3 conventional magnet test stands           FY06:
       tested 21 conventional magnets
      Cryogenic engineering, data acquisition systems,
       diagnostic instrumentation, software and data
       management, etc.

   Continue to share cryogenic system and IB1
    infrastructure with magnet test program
        Cryogenically demanding LHC magnet production
         tests are finished
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                    Vertical Cavity Test Facility                                                      Fermilab




                                    Vertical Cavity Test Facility (VCTF)
                                    One Vertical Test Stand (VTS) in Industrial Building 1 (IB1)
                                    Single, bare 1.3 GHz 9-cell Tesla-style cavities
                                        Measure Q vs. T (Tmin~1.5 K)
                                        Measure Q vs. Eacc at 2 K
                                    RF design parameter: 250 W (CW) max power at cavity
                                        Q>5x109 and Eacc<35 MV/m
                                         or generally: Pd = (1.04 x 10-3)* Eacc2/Q < 250 W
                                    Use existing IB1 cryogenic capacity ~125 W at 2 K
                                        250 W for short periods without excessive helium bath
                                         temperature increase
                                    Magnetically shielded cryostat
                          vacuum        Ambient field in IB1 pit measured consistent with Earth’s field
                          vessel         ~0.5 G
                          f=42”
radiation
shielding
                                        External (room-temperature) Amumetal® (80% Ni alloy) and
                                         internal Cryoperm 10® magnetic shield, designed to attenuate
                                         field to <0.01 G at cavity
   cavity                           Radiation shielding to maintain “Controlled Area” status in
                          helium
                          vessel
                                     IB1
                          26.5”         < 5 mrem in an hour immediately outside the shielding
                                        <0.25 mrem/hr in normal working areas
   fiberglass
   pit liner

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               VCTF Major Milestones                                  Fermilab




     12/2005: Project started
     06/2006: Civil Construction
     09/2006: Cryostat ordered
     03/2007: Cryostat installed
     05/2007: Cryosystem commissioned
     06/2007: LLRF system commissioned
     07/2007: Radiation shielding complete
     07/2007: Safety permission to operate fully integrated system
     07/2007: First single-cell cavity test
     09/2007: First 9-cell cavity test
     10/2007: (projected) VCTF ready for operation




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                     VCTF 1st 1-cell test                                                                                                Fermilab




               First high-power single-cell cavity test July 24, 2007
               Large-grain niobium cavity borrowed from JLab
               Tesla-style shape (straight end tubes)
               Good cavity performance, comparable to performance at JLab
                  quench at 27 MV/m accompanied by field emission
               First try at sending an evacuated cavity from JLab to Fermilab –
                important for cavity and process qualification
                                                                         SC01
                                                                     July 24, 2007
                                      1.E+11                                                               1.E+02
                                                   Qo
                                                   x-ray flux


                                      1.E+10                                                               1.E+01




                                                                                                                    x-ray flux [mR/hr]
                                 Q0




                                      1.E+09                                                               1.E+00
                                                                             Quench at 27 MV/m




                                      1.E+08                                                               1.E-01




                                      1.E+07                                                               1.E-02
                                               0            5   10         15          20        25   30
                                                                     gradient [MV/m]


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            VCTF 1st 9-cell cavity test                                                                                                           Fermilab




                      First 9-cell test September 7, 2007
                      AES01 cavity
                             Tested at JLab for AES vendor qualification
                             Borrowed for VCTF commissioning
                      Tesla-style shape, with normal endgroup
                      Mediocre cavity performance, comparable to performance at JLab
                             Quench at 17 MV/m without field emission
                        Second try at sending an evacuated cavity from JLab to Fermilab
                             important for cavity and process qualification
                                                                                    AES01
                                                                               September 7, 2007
                                             1.E+11                                                                                    1.E+02
                                                          Qo
                                                          x-ray flux


                                             1.E+10                                                                                    1.E+01




                                                                                                                                                x-ray flux [mR/hr]
                                                                                                       Quench at 15.6 MV/m
                                        Q0




                                             1.E+09                                                                                    1.E+00




                                             1.E+08                                                                                    1.E-01




                                             1.E+07                                                                                    1.E-02
                                                      0      2         4   6    8         10      12       14      16        18   20
                                                                                    gradient [MV/m]


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                                    VCTF Plans                                                   Fermilab




Black: current/under construction
Red: proposed upgrade
                                      Increase cavity test throughput
                                          Current throughput estimate: 48 cavity
                                           tests/year
                                          Increase throughput to >200 cavity tests/year
                                           by FY10 (dependent on funding):
                                                Improve cryogenic system reliability (FY08)
                                                Reduce interference with magnet test program
                                                 (FY08)
                                                Two more cryostats and staging area (FY09)
                                      Cavity diagnostics and R&D through FY08
    existing                              Cavity vendor qualification (9-cells and
    cryostat &
    radiation
                                           single-cells)
    shield                                9-cell thermometry system development
                                          Additional diagnostic instrumentation
                                                Variable input coupler, x-ray detectors, etc.
                                          Test other types of cavities
                                                Single-spoke cavities for HINS, hydroformed
                                                 cavities from DESY, etc.
                                          S0 tests (with cavity surface processing at
                                           JLab and Argonne)

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                           Conclusions/Plans                                                              Fermilab




   Vertical Cavity Test Facility with one Vertical Test Stand now operational
      Commissioning activities ongoing
              Understand the cryostat/cryosystem performance and capability with the thermal load
              Train personnel
              Complete magnetic shielding
        Will establish Fermilab as an ILC cavity testing facility in FY08

   Develop Fermilab SRF expertise & Fermilab role in SRF technology advancement
      Study cavity characteristics for vendor qualification, understanding cavity processing
              Passband mode measurements
              Thermometry for quench location – flexible R&D system already available
        Develop cavity diagnostic instrumentation – now with increased priority
              9-cell thermometry
              Variable coupler
        Apply advances to new projects
        Collaborate with university groups & other labs
              Accommodate visitors with user-friendly facility

   Planned upgrades – based on analysis of existing system capability & dependent on funding
        Inputs: Considerable experience from Fermilab Magnet Test Facility, and cavity test operations
         information from other labs
        Cryogenic system upgrade planned for FY08
        Additional cryostats planned for FY09




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                     Project People                 Fermilab




 VTS Group: Camille Ginsburg (VTS Project Physicist),
  Cosmore Sylvester (VTS Project Engineer), R. Carcagno
  (ILC IB1 Infrastructure Project Leader), Y. Huang,
  R. Nehring, B. Norris, J. Ozelis, V. Poloubotko,
  R. Rabehl, I. Rakhno, C. Reid, T. Peterson, M. Wong,
  C. Worel, A. Yuan
 Important VTS contributions: C. Brown, A. Lunin,
  A. Mukherjee, O. Prokofiev, D. Sergatskov, TD Support
  Department, TD T&I Department, ES&H Section




September 10, 2007        C.M. Ginsburg AEM         12

				
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