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

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Project People
Project Coordination C.M. Ginsburg, C. Sylvester
Civil Construction R. Alber (FESS), C.M. Ginsburg, C. Sylvester
Cryostat and Top Plate Y. Huang, T. Peterson, R. Rabehl, C. Reid, C. Sylvester, M. Wong
Cryo System Modifications Y. Huang, T. Peterson, R. Rabehl, C. Reid, C. Sylvester, M. Wong
Cryo Controls Y. Huang, T. Peterson, R. Rabehl, C. Sylvester, (TD/IC)
Cryo Commissioning Y. Huang, T. Peterson, C. Sylvester, (TD/IC)
Radiation Shielding C. Brown, C.M. Ginsburg, M. Herr, G. Lauten (AD), I. Rakhno (AD)
Safety (PSS) Interlocks C. Worel (AD/ESH/Interlocks group)
RF/LLRF R. Carcagno, C.M. Ginsburg, J. Ozelis, P. Seifrid (AD)
Test Stand Commissioning A. Lounine, C.M. Ginsburg, J. Ozelis, O. Prokofiev
New C. Brown, Y. Huang, G. Lauten, R. Rabehl, I.
Rakhno, P. Seifrid, C. Worel
Arrived J. Ozelis
Not yet A. Lounine
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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
  (Q5x109, Eacc35 MV/m)
• Maintain Controlled Area status in IB1
• lt 5 mrem/hr immediately outside the shielding
• lt0.25 mrem/hr in normal working areas

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GDE Document

• Contents
• technical information and schedule
• plans for FY 06
• Status
• Draft complete
• Reviewed by group members
• Forwarded to Shekhar today

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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

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DESY-TTF Vertical Facility
Moeller
1m
0.1m
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DESY TTF measured maximum x-ray flux
Maximum x-ray flux 58 R/hr, typically much less
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DESY TTF measured maximum x-ray flux

• The measured x-ray flux above dewar top plate
• lt6 R/hr 90 of the time
• lt30 R/hr 99 of the time
• always lt58 R/hr

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DESY TTF measured maximum x-ray flux
4 different cavities
Requiring Qgt5E9 very effective, but still need
x-ray flux limit
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Eacc at DESY/TTF

• DESY TTF data
• ltEaccgt increasing with time
• Significant spread all years

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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

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Rakhno
ILCTA_IB1_VTS Preliminary Design
Igor will re-do with latest geometry
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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)

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Cryostat (based on DESY/TTF)

• Added a phase separator to provide better quality
  liquid helium
• Estimated RF cycle time based on Pd255 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

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Status/Schedule (ILCTA_IB1)
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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)

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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
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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.
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Backup
ILCTA_IB1_VTS Preliminary Design
1.52m
Reid
min cavity depth
2.8m
max cavity depth