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Vertical SRF Cavity Test Stand (ILCTA_IB1_VTS)

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19 diapositives · 359 Views · Nov 09, 2014

Vertical SRF Cavity Test Stand (ILCTA_IB1_VTS). C.M. Ginsburg and C. Sylvester TD Department Heads Meeting March 13, 2006. Project People. New : C. Brown, Y. Huang, G. Lauten, R. Rabehl, I. Rakhno, P. Seifrid, C. Worel. Arrived: J. Ozelis. Not yet: A. Lounine. Project Scope.

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  1. Vertical SRF Cavity Test Stand(ILCTA_IB1_VTS) C.M. Ginsburg and C. Sylvester TD Department Heads Meeting March 13, 2006

  2. Project People New: C. Brown, Y. Huang, G. Lauten, R. Rabehl, I. Rakhno, P. Seifrid, C. Worel Arrived: J. Ozelis Not yet: A. Lounine CMGinsburg/TD-DH mtg

  3. 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 CMGinsburg/TD-DH mtg

  4. GDE Document • Contents: • technical information and schedule • plans for FY ‘06 • Status • Draft complete • Reviewed by group members • Forwarded to Shekhar today CMGinsburg/TD-DH mtg

  5. 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 CMGinsburg/TD-DH mtg

  6. DESY-TTF Vertical Facility Moeller 1m 0.1m CMGinsburg/TD-DH mtg

  7. DESY TTF measured maximum x-ray flux Maximum x-ray flux 58 R/hr, typically much less CMGinsburg/TD-DH mtg

  8. DESY TTF measured maximum x-ray flux • The measured x-ray flux above dewar top plate • <6 R/hr 90% of the time • <30 R/hr 99% of the time • always <58 R/hr CMGinsburg/TD-DH mtg

  9. DESY TTF measured maximum x-ray flux 4 different cavities Requiring Q>5E9 very effective, but still need x-ray flux limit CMGinsburg/TD-DH mtg

  10. Eacc at DESY/TTF • DESY TTF data • <Eacc> increasing with time • Significant spread all years CMGinsburg/TD-DH mtg

  11. 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 CMGinsburg/TD-DH mtg

  12. Rakhno ILCTA_IB1_VTS Preliminary Design Igor will re-do with latest geometry CMGinsburg/TD-DH mtg

  13. 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) CMGinsburg/TD-DH mtg

  14. 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 CMGinsburg/TD-DH mtg

  15. Status/Schedule (ILCTA_IB1) CMGinsburg/TD-DH mtg

  16. 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) CMGinsburg/TD-DH mtg

  17. Backup: Location • West side of IB1, North of the Vertical Magnet Test 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 Vert. SRF Cryostat Cryo Piping CMGinsburg/TD-DH mtg

  18. Backup: Location (contd.) • The long-term plan for IB1 is to have both a vertical and a horizontal test facility Radiation Shielding VMTF Vertical SRF IB1 Control Rm. CMGinsburg/TD-DH mtg

  19. Backup ILCTA_IB1_VTS Preliminary Design Reid 1.52m min cavity depth 2.8m max cavity depth CMGinsburg/TD-DH mtg