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Vertical SRF cavity Test Stand _ILCTA_IB1_VTS_

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					Vertical SRF Cavity Test Stand
       (ILCTA_IB1_VTS)
  C.M. Ginsburg and C. Sylvester
  TD Department Heads Meeting
         March 13, 2006
                        Project People
Project Coordination   C.M. Ginsburg, C. Sylvester
Civil Construction     R. Alber (FESS), C.M. Ginsburg, C. Sylvester
Cryostat and Top       Y. Huang, T. Peterson, R. Rabehl, C. Reid, C. Sylvester, M. Wong
   Plate
Cryo System            Y. Huang, T. Peterson, R. Rabehl, C. Reid, C. Sylvester, M. Wong
   Modifications
Cryo Controls          Y. Huang, T. Peterson, R. Rabehl, C. Sylvester, (TD/I&C)
Cryo Commissioning     Y. Huang, T. Peterson, C. Sylvester, (TD/I&C)
Radiation Shielding    C. Brown, C.M. Ginsburg, M. Herr, G. Lauten (AD), I. Rakhno (AD)
Safety (PSS)           C. Worel (AD/ESH/Interlocks group)
    Interlocks
RF/LLRF                R. Carcagno, C.M. Ginsburg, J. Ozelis, P. Seifrid (AD)
Test Stand             A. Lounine, C.M. Ginsburg, J. Ozelis, O. Prokofiev
    Commissioning

 New: C. Brown, Y. Huang, G. Lauten, R. Rabehl, I. Rakhno, P. Seifrid, C. Worel
 Arrived: J. Ozelis             Not yet: A. Lounine
13.Mar.06                         CMGinsburg/TD-DH mtg                                    2
                Project Scope
• Bare 1.3 GHz 9-cell Tesla-style cavities
• Cryo capacity ~60 W at 2 K
• Measure Q vs. T and Q vs. Eacc
• 250 W RF power required at maximum
  gradient (Q=5x109, Eacc=35 MV/m)
• Maintain “Controlled Area” status in IB1
     < 5 mrem/hr immediately outside the shielding
     <0.25 mrem/hr in normal working areas
13.Mar.06           CMGinsburg/TD-DH mtg          3
               GDE Document
• Contents:
     – technical information and schedule
     – plans for FY ‘06
• Status
     – Draft complete
     – Reviewed by group members
     – Forwarded to Shekhar today



13.Mar.06            CMGinsburg/TD-DH mtg   4
       Radiation Physics Analysis
      DESY data (Moeller and Gall, private communication)


     Data measured over ~12 years, ~85 cavities
     X-ray flux measured
        ~5 cm off axis
        above 1” SS top plate
        above 50 kg shielding inside cryostat
           • 20 cm Pb + 5 cm Al
     Maximum x-ray flux 58 R/hr
     Plots and statistical analysis of DESY data by CMG


13.Mar.06              CMGinsburg/TD-DH mtg                5
  DESY-TTF Vertical Facility
                    Moeller

                                            1m




                  0.1m




13.Mar.06            CMGinsburg/TD-DH mtg   6
                                      DESY TTF measured maximum x-ray flux
                                                                      DESY TTF measured x-rays


                            70

                                                 should be ignored                measured ~5cm off axis, above 1" SS top plate
                            60


                            50
        _
        x-ray flux [R/hr]




                            40


                            30



                            20


                            10



                             0
                                 0                200                400           600              800             1000              1200
                                                                                  date
                                     March 22, 1994                                                                               Jan.12,2006



                            Maximum x-ray flux 58 R/hr, typically much less

13.Mar.06                                                            CMGinsburg/TD-DH mtg                                                       7
                         DESY TTF measured maximum x-ray flux
                                                  DESY TTF data


                   900


                   800           The measured x-ray flux above dewar top plate
                   700
                                 <6 R/hr 90% of the time
                                 <30 R/hr 99% of the time
                   600            always <58 R/hr
     # entries _




                   500


                   400


                   300


                   200


                   100


                    0
                                 12


                                      16


                                           20


                                                  24


                                                         28


                                                                32


                                                                       36


                                                                            40


                                                                                 44


                                                                                      48


                                                                                           52


                                                                                                56
                     0


                         4


                             8




                                                       x-ray flux [R/hr]




13.Mar.06                                       CMGinsburg/TD-DH mtg                                 8
                                    DESY TTF measured maximum x-ray flux
                                                                       DESY TTF

                               60



                               50



                               40
            _
            xray flux [R/hr]




                                                                       red triangles: cavity c19
                               30



                               20
                                                          4 different cavities
                               10



                                0
                               0.E+00   5.E+09   1.E+10    2.E+10   2.E+10   3.E+10    3.E+10      4.E+10   4.E+10   5.E+10   5.E+10
                                                                               Q
                                          Q=5E9


                                    Requiring Q>5E9 very effective, but still need x-ray flux limit

13.Mar.06                                                    CMGinsburg/TD-DH mtg                                                      9
                                    Eacc at DESY/TTF




                                    DESY TTF data
                                    <Eacc> increasing with time
                                    Significant spread all years




13.Mar.06   CMGinsburg/TD-DH mtg                            10
       Radiation Shielding Design
                                                   Rakhno


  • For 90% of all tested RF cavities the measured dose
    rate ≈ 5 Rad/hr. Use 90% level as baseline.
  • Thickness of the vertical concrete wall in the recessed
    region: 2 ft. An option – lead bricks.
  • Shielding layers of Pb and polyethylene immediately
    above the RF cavity
  • 3H production in surface water UPPER LIMIT: 2000
    pC/ml-yr; will check against current design; probably a
    non-issue



13.Mar.06              CMGinsburg/TD-DH mtg                 11
                                               Rakhno


ILCTA_IB1_VTS
Preliminary Design

 Igor will re-do with
 latest geometry




13.Mar.06               CMGinsburg/TD-DH mtg            12
              Civil Construction Status
• Need Radiation Safety Go-Ahead
     – Analysis by CMG (DESY data)
     – Shielding Design by Igor Rakhno (AD)
     – Safety Review by Mike Herr and Gary Lautenschlager (AD)
            • Civil construction: bottom of the shaft, recessed area
     – Chuck Brown (AD) will assist at next meeting March 23
• (behind) Schedule:
     –   Go out for Bids (Mar. 6th)
     –   Award Bid (Mar. 31st)
     –   Begin Work (April 3rd)
     –   Contractor on-site ~ 3 weeks
     –   Work Completed (June 20th)


13.Mar.06                        CMGinsburg/TD-DH mtg                  13
   Cryostat (based on DESY/TTF)
• Added a phase separator to
  provide better quality liquid
  helium
• Estimated RF cycle time
  based on Pd=255 W and
  cryogenic capacity in IB1
  (Huang)
     – 40% RF duty factor
• One Engr. (Rabehl) added to
  team to focus on cryogenic
  controls
• Made progress on the
  Process and Instrumentation
  Diagram

13.Mar.06                   CMGinsburg/TD-DH mtg   14
 Status/Schedule (ILCTA_IB1)

 Component      M&S Cost        Design          Fabrication       Assy (IB1)
Cryostat and     $K200      mid Q2 to mid     end of Q3 to     end of Q4 (06)
Top Plate                   Q3 (06)           end of Q4 (06)   to Q1 (07)
Civil            $K100      Complete          end of Q2 to     end of Q2 to
Construction                                  end of Q3 (06)   end of Q3 (06)
Cryo System       $K50      mid Q3 to end     end of Q3 to     end of Q3 to
Modifications               of Q3 (06)        end of Q4 (06)   end of Q4 (06)
Cryo Controls   TBD         TBD               TBD              TBD
Radiation       TBD         TBD               TBD              TBD
Shielding




13.Mar.06                  CMGinsburg/TD-DH mtg                            15
                  Next Plans
• Get Rad Safety go-ahead for Civil
  Construction and go for bids ASAP
• Begin RF instrumentation design with ILC
  HLRF people in about 3 weeks,
  meanwhile:
     – Determine location of instrumentation racks
     – Create RF instrumentation wish-list
     – Finger person to design input coupler
       (Lounine)

13.Mar.06            CMGinsburg/TD-DH mtg            16
               Backup: Location
• West side of IB1, North of
  the Vertical Magnet Test                    Vert. SRF
                                              Cryostat
                                                          Cryo
                                                          Piping
  Facility (VMTF)

   – This location allows for the
     future construction of a
     concrete block structure for
     accommodating a horizontal
     test cryostat
   – Is in close proximity to the
     existing VMTF Cryogenic
     piping; may simplify the tie-in
     to the cryogenic services
13.Mar.06              CMGinsburg/TD-DH mtg                   17
            Backup: Location (contd.)
 • The long-term plan for IB1 is to have
   both a vertical and a horizontal test
                          Radiation
   facility
         VMTF
                          Shielding




                 Vertical
                 SRF                          IB1 Control
                                              Rm.


13.Mar.06                   CMGinsburg/TD-DH mtg            18
    Backup

    ILCTA_IB1_VTS
    Preliminary Design

   Reid                                          1.52m
                                                 min cavity depth




                                                2.8m
                                                max cavity depth




13.Mar.06                CMGinsburg/TD-DH mtg              19

				
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