WANG, Li

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MICE/Muool Coupling Magnets Progress
WANG, Li 2009-01-15 Institute of Cryogenics and
Superconductivity Technology Harbin Institute of
Technology, China
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Contents

• MICE/MuCool Coupling Magnet Updated Design Review
• Done in ICST/HIT on Dec.06 to Dec.08, 2008,
  and further improvement has been carried out
  after the review according to the Close Out from
  the review panel (to be presented by Hong Wu/Heng
  Pan/XingLong Guo).

• Large Coil Test and Plan
• To be presented by Dr. FengYu Xu

• Fabrication Plan of MICE/MuCool Coupling Magnets
• Visits to possible collaborators in China
  Request for quotations and further technical
  discussions, preparation for public bidding
  procedure etc.

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MICE/MuCool Coupling Magnet Updated Design
The updated engineering design were carried
out according to the A Technical Agreement on
the MICE and MuCool Coupling Solenoid Magnet
Fabrication, Assembly, Test and Shipping issued
in September, 2007 and experience learnt form
test coils winding in collaboration with
Lawrence Berkeley National Laboratory. The main
differences between the previous design reviewed
in May, 2007 and the updated design reviewed in
Dec., 2008 mainly include

• The inner radius of the coupling coil is changed
  from 744mm to 750mm considering very tight space
  on the inner side of the magnet.
• The coil assembly is designed different from the
  previous one in terms of winding, mandrel
  fabrication, cooling and quench protection
  assembly.
• A double-band cold mass support system is
  presented instead of a single-band system
  considering the shipping load during long-term
  transportation and space limitation.

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• Two drop-in PTR coolers are to be used for
  cooling the coupling magnet for the sake of easy
  removal from the cryostat during transportation.
• Thermal shields are designed to be supported from
  the vacuum vessel by four pairs of G-10 rods
  instead of being supported onto the cold mass
  support assembly as previous design.
• The cooling configuration for the warm end of the
  HTS leads is designed different from the previous
  one.

Further improvement after the review

• To validate
• Stress analyses on final coil cold mass
  design, mechanical (loads, stress) and thermal
  analyses on the current design for the coil cold
  mass support assembly, stress and deflection
  analyses on the vacuum chamber, etc.
• To update the following engineering design
  drawings
• Vacuum chamber and interface, coil cold mass
  assembly, cold mass support assembly, etc.

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Updated design
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Piping round tubing instead of ? type tubing
more cold surface to mount QPAssembly more space
for mounting CMSupport cold end base, etc.

• Coil assembly and its cooling

Updated design
Previous design
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• Cold mass support system

Single-band to double-band space for cold end
base and its strength
Previous design
Updated design
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Large Coil Test and Plan

• SC splices strength test at LHe temperature
• The strength of SC splices soldering by Sn-Ag
  solder under LHe temperature is a major concern
  presently considering the rigorous stress state
  in the coupling coil because all the splices are
  wound inside the coil and should be tested before
  winding the MuCool coil according to Dr. Mike
  Greens advice.
• ICST has performed the strength test for the SC
  splices at LN2 temperature and the results show
  its strength is close to that of the SC wire
  itself .
• ICST has prepared some of SC splices and to see
  if they could be tested in LBNL under LHe
  temperature.

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Winding of prototype coil
Cryo-test system
Welding
Cryostat for prototype coil
Large test coil
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Fabrication Plan of MICE/MuCool Coupling Magnets

• Visits to possible vendors in China last December
• CSRDA in Beijing
• Experience in fabrication and assembly of
  coil mandrel cooling tubing welding, heat
  shields vacuum chamber for SSM and Ion-removal
  SC solenoid in BEPCII, fabrication, assembly, and
  maintenance of several MRI magnet systems since
  1987 (winding coil, cold mass, cryostat, etc.).
• SINAP in Shanghai
• Experience in fabrication, assembly and test
  of a small SC magnet (EBIT, solenoid coil ID
  100mm) for Shanghai FuDan University, various
  advanced equipment or device for alignment,
  measurement and cryo-test, a set of 600W/4.5K
  refrigerator system etc.

• Request for quotation
• Cold mass assembly by Jan. 17
• Cryostat assembly by the middle of February

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Plan for Fabrication the MuCool magnet

• Possibilities to cause delays
• Manpower skilled technicians and their
  supervisor, experienced mechanical engineers,
  etc.
• Funds available time?
• Request for quotation
• Further technical discussions with possible
  vendors before public bidding for Cryostat
  Assembly (after Chinese Spring Festival till Feb.
  1st ) are needed.
• Public bidding procedure
• At least 3 vendors and 7 days workday for
  publicity, otherwise invalid bidding if sole
  source, it will take a longer time, more paper
  work and complicated procedure.
• Contract award and sign it after bidding
• At least one to two weeks are needed.
• Winter holidays in HIT Jan. 19 to Feb. 22
• No possibility for processing bidding in HIT

Hopefully, to contract the first MuCool coil
assembly fabrication out before or right after
the Chinese Spring Festival (at latest by the
middle of this February) in order to avoid more
delay!
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Thank You !
Icst.hit.edu.cn

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