Cooling Channel Summary Michael S. Zisman Center for Beam Physics Accelerator & Fusion Research Division Lawrence Berkeley National Laboratory MICE Collaboration

Cooling Channel Summary

Michael S. ZismanCenter for Beam Physics

Accelerator & Fusion Research DivisionLawrence Berkeley National Laboratory

MICE Collaboration Meeting-HarbinJanuary 16, 2009

January 16, 2009 Cooling Channel Summary: Zisman

2

Introduction•Cooling channel comprises (we hope!)

— three FC modules, each with LH2 absorber— two RFCC modules, each with one coupling coil and 4 RF cavities


3

The Main Players•Focus coil module

— Oxford + RALo Wing Lau, Tom Bradshaw

•Absorbers— KEK + U.-Miss (LH2)

o Shigeru Ishimoto, Don Summers— Fermilab (LiH)

o Alan Bross

•RFCC module— LBNL + HIT

o Derun Li, Steve Virostek, Allan DeMello, Li Wang, FengYu Xu

•Along with a lot of RAL infrastructure support— especially the hydrogen delivery system

o Mike Courthold, Matt Hills, Tom Bradshaw


4

Focus Coil Module Status (1)•Contract let with Tesla Engineering

— suggested design modification made at PRRo pipe cooling instead of bath cooling

– avoids pressure vessel stress issues– requires Al bobbin; stainless steel unacceptable

o expected to result in an overall better design

•Anticipated delivery date is now early 2010 for first item

•Main issue— STFC has committed only to Step 5 (two FC modules)

o we need a third FC module to reach Step 6— this has impact on RFCC fabrication approach as well


5

Focus Coil Module Status (2)•Design update

— bobbin enlarged to increase strength— vacuum vessel design strength calculation completed— cold mass support material (“S-glass”) strength measured

o somewhat lower than originally assumed; accommodate in updated design

— quench protection will be activeo passive system found unacceptable

– need to understand this; other magnets concluded differently— thermal design updated for indirect cooling; 0.3° margin (okay!)

o still an issue if power supply operated at full current– need to prevent this by engineering

— preparing list of instrumentation cables— developing splice procedure for testing— project plan updated (shows 39 day delay, but not optimized yet)


6

Focus Coil Module Status (3)•FC module design (from Tesla)


7

Absorber Status (1)•Design complete and fabrication under way in Japan

— three absorbers being builto this is a commitment to Step 6!

•Al windows being fabricated at U.-Miss— they built the windows tested previously...and successfully!— initial batch will be used for destruction testing to validate design

strengtho plan is not to destruction test any of the windows used in MICE

– shifters should be prepared to honor this plan!

•H2 R&D system built at vendor, under RAL supervision— work lagged badly but effort now under way to reinvigorate it— the test system will become System 1 for MICE

•LiH disks (from ORNL) will be provided by Fermilab— safety issues minor but need to be addressed


8

Absorber Status (2)•Detailed design of absorber


9

Absorber Status (3)•Absorber schedule

— first one at RAL in Augusto can this be tested at RAL?


10

Absorber Status (4)•First new absorber window at U.-Mississippi (sacrificial)— will be sent to LBNL for measurement


11

RFCC Module Status (1)•Design for coupling coil essentially complete at ICST— review in December uncovered no significant technical issues— large test coil fabrication now complete

o testing will start in March– permission to commence with winding of first “real”

magnet (for MuCool R&D program) will be based on large coil test resultsLarge Test

CoilLarge Test Coil Vacuum Vessel


12

RFCC Module Status (2)•Cavity design complete (DeMello, Virostek)

— RFP sent out on January 12, 2009o expect responses by end of Januaryo requesting 9 month fabrication schedule

— then, evaluate bids to select the besto several variants

– buy all 10 at once– buy 5 with option for additional 5

o in principle, choice hinges on UK actions on Step 6– dilemma: likely must decide before we get UK commitment

•Issues:— LN temperature operation still poses challenges (and risks)— need to make sure the RF power is available when needed for

testing— safety aspects of this system need to be evaluated


13

RFCC Module Status (3)•RFCC design

— plan for test assembly at LBNL and then removing cavities for shipping

SC coupling Coil

Cavity Couplers

Vacuum Pump201-MHz cavity201-MHz cavity

Curved Be window


14

RFCC Module Status (4)•A number of potential bidders pre-qualified for bid list

e-beam welder at Meyer Tool

e-beam welder at Roark Welding & Engineering

e-beam welder at Applied Fusion


15

Final Remarks•Good progress is being made on the cooling channel components— thanks to the help of a skilled and dedicated engineering staff

•When the RF cavity contract is let, all major cooling channel components will be in production

•Still needed — update all WBS schedules— develop more reliable cost-to-complete estimates— operating procedures and safety manuals

o cannot leave MICE unattended when magnets are on– what about off, but cold?

Documents

Cooling Channel Summary Michael S. Zisman Center for Beam Physics Accelerator & Fusion Research Division Lawrence Berkeley National Laboratory MICE Collaboration