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MICE Coupling Coil Update

Published byAvice Goodman Modified over 6 years ago

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Presentation on theme: "MICE Coupling Coil Update"— Presentation transcript:

1 MICE Coupling Coil Update
MICE CM34 at RAL, UK October 17, 2012 Allan DeMello Lawrence Berkeley National Laboratory

2 Current Status of Coupling Coil
Cold Mass Reservoir welded onto cold mass Cooling pipes welded into cold mass slots Epoxy impregnation of gap between coil and cover plate complete LTS lead stabilization complete Quench protection mounted Instrumentation mounted Pressure test of cooling pipe complete Vacuum check of pipe (discovered leak) High-pot test of coil complete

3 Current Status of Coupling Coil
Cryostat Drawings from SINAP (China) complete Work order has been approved for the LBNL mechanical shop to start fabricating the first cryostat

4 Coupling Coil General Dimensions

5 Major Sub-Assemblies 5

6 A Brief History of the Cold Mass
Unfinished cold mass from China arrives at LBNL October 2011 Design of cooling scheme, LTS lead stabilization and quench protection still incomplete LBNL engineers met with Brad Smith and his team at the Massachusetts Institute of technology (MIT) in March of 2012 MIT group designed and LBNL implemented an LTS lead stabilization system and a quench protection system MIT group refined the cooling system designed by Tapio Niinikoski (CERN) and Li Wang (SINAP)

7 Cooling Pipes Welded onto Cold Mass
Pipes welded into the slots of the cold mass Cross-section view

8 Reservoir Welded onto Cold Mass
Dual – action actuator Finished tuner arm Jan , 2012 in Fermilab Flexure tuner arm Helium reservoir Helium reservoir welded onto cold mass

9 Cold Mass Preparation Cold mass on milling machine for drilling and taping of holes for the lead stabilization and quench protection hardware mounting bolts

10 LTS Lead Stabilization
Met with Brad Smith and his team in March 2012 MIT group designed and LBNL implemented LTS lead stabilization HTS to LTS thermal intercept (Bert Wang design) LTS lead stabilizers

11 Quench Protection MIT group designed and LBNL implemented quench protection system Diodes LTS loops secured to the cold mass

12 Epoxy Impregnation Cold mass in the paint shop oven for epoxy cure
Cross section view Gap between cover plate and aluminum banding was filled with epoxy

13 Cooling Pipe Pressure Test
Cooling pipe was hydrostatically tested, in steps, to a pressure of 300 psi No leaks detected

14 Instrumentation Heater Strain Gauges Voltage Taps Cernox Sensor

15 Cooling Pipe Vacuum Leak
The vacuum leak was determined to be in this area behind pipe Section View

16 Cooling Pipe Vacuum Leak
Welding was done to attempt to seal the leak Plastic cover clamped into place over opening for vacuum check The vacuum leak was determined to be at the back of pipe. An opening was cut into pipe so welding could be done, from the inside, to the back area of the pipe

17 Cooling Pipe Vacuum Leak
Leak determined to be towards the top of the pipe and welding was done, outside, to attempt to seal it A permanent cover was welded into place over opening Several attempts to seal the vacuum leak have failed. LBNL is currently waiting for guidance from Fermilab safety review panel for a by-pass repair

18 Fermilab Test Setup

19 Coupling Coil Cryostat
Single Cavity Vacuum Vessel Exploded View

20 Coupling Coil Cryostat
Cryostat design is complete Drawings from SINAP (China) complete LBNL mechanical shop will fabricate the first cryostat Estimated to take 6 months to complete fabrication Drawings will be updated to reflect the “as built” cryostat

21 Coupling Coil Thermal Shield Drawings
Drawings have been red lined but not updated Thermal shield design is nearly complete Some SINAP parts/drawings will need to be revised for better manufacturability

22 Cooling Circuit Cryocoolers First Stage Copper Plates Helium Fill Line
Finalize design Update drawings Generate any new drawings as needed Thermal Siphon Manifold

23 Coupling Coil Future Work
Cold Mass: Determine plan to repair the leaking cooling pipe with guidance from Fermilab safety review committee Vacuum check the two remaining pipes – Done Pressure test the remaining 2 pipes to 240 psi Implement the repair plan for the leaking pipe Pressure test the previously leaking pipe to 300 psi Vacuum check all of the pipes Ship to Fermilab for magnetic tests

24 Coupling Coil Future Work
Cryostat: Fabricate first cryostat – 6 months to complete Update any drawings to reflect changes generated for “as built” Determine fabricator for the additional 2 cryostats Thermal Shield: Update red lined drawings Modify some parts for better manufacturability LBNL shops may fabricate the first thermal shield Cooling Circuit: Finalize design Update drawings Generate any new drawings as needed

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