1. Spectrometer Solenoid and RFCC Update Michael S. Zisman Center for Beam Physics Accelerator & Fusion Research Division Lawrence Berkeley National Laboratory Technical Board Meeting—RAL December 14, 2009

2. Technical Board:Zisman2 Acceptance Criteria (1) The magnet sustains its design current for 24 hours —okay Minimum period between LHe top-ups is six weeks (approx. length of ISIS user run) —prefer this as “desired” performance rather than hard requirement o not sure how well we can measure it Matching coils to perform within their agreed operating margin —do not understand this one o all coils being trained together to maximum field –design criterion should be 200 MeV/c, not 240 MeV/c

3. December 14, 2009Technical Board:Zisman3 Acceptance Criteria (2) The power supply requirement of the review must be understood, documented and circulated —again, not sure what this means o documentation needs to include “discharge circuits” o and updated interlocks of HTS leads –interlocks must be done as part of DL controls effort The declaration of conformity for the cryostat/pressure system must be completed —agreed o need to work out exact needs with SV An installation drawing and specification of the as-built magnet to be provided —to what level of detail? o new cooler will be shown; MLI arrangements probably not

4. December 14, 2009Technical Board:Zisman4 Spectrometer Solenoid Status Vendor working on both magnets in parallel —magnet 2 being modified to accommodate additional 1-stage cooler —magnet 1 was modified to accommodate 4 th 2-stage cooler o with room for a single-stage cooler as well, if needed —based on review, some optimism that 4 th 2-stage cooler will not be needed First single-stage cooler at vendor now —will order another one for magnet 1 ASAP Lead tests have been prepared but not yet run —small intermittent leak in a weld that was hard to find o now fixed Discharge circuit has been fabricated —will be tested as part of “training” procedure

5. December 14, 2009Technical Board:Zisman5 Magnet 2 Single Stage Cooler Magnet 2 cooler —should handle heat load from HTS leads

6. December 14, 2009Technical Board:Zisman6 Cryocooler Connections Cryocooler 2 and 3 connections on magnet 2 —connections from cooler to copper plates getting more instrumentation o connection from copper plate to shield unchanged from previous test –thermal connection is (at best) problematical

7. December 14, 2009Technical Board:Zisman7 Discharge Circuit Fabrication completed for magnet 2 —awaits testing during “training” exercise (January)

8. December 14, 2009Technical Board:Zisman8 Magnet 1 Modifications Changes to permit 4 th 2-stage cryocooler basically complete —based on review, will purchase additional single-stage cooler for this magnet also o at present, this looks like solution of choice –if magnet 2 works well, magnet 1 will surely work even better  shield connections on magnet 1 being greatly improved —hope is to have magnet 1 ready soon after magnet 2 is retested o should minimize schedule delay even if magnet 2 changes do not solve all problems –high likelihood of being able to train magnet 2 to full current –no guarantee that magnet 2 will operate without needing “top-up” of cryogens  carrying out thermal calculations now to examine this, but real proof awaits testing  proposed goal is >6 weeks between top-ups

9. December 14, 2009Technical Board:Zisman9 Magnet 1 Shield Shield will have copper connections from cooler Stage 1 —shield will also be “beefed up” locally to improve heat transfer to edges o this is where cold-mass support intermediate temperature point is connected Improved heat transport to cold-mass supports thermal intercept Improved thermal connection from cooler Stage 1

10. December 14, 2009Technical Board:Zisman10 Schedule Magnet 2 was supposed to be buttoned up by now —late due to illness at vendor o cooler not yet installed o build-up of turret not completed —may be January before tests begin o hope is still to arrive at decision point in January –but will not be mid-January o initial cool-down apparatus from Fermilab is also unavailable –will get update on this schedule later this week

11. December 14, 2009Technical Board:Zisman11 Spectrometer Solenoid Plans Continue with magnet 2 training to reach 270 A or beyond —quantify thermal margin using cold-mass heater Continue work on magnet 1 —about 2 months behind magnet 2 at present Evaluate power supplies to test proposed circuit modifications —this is “external” and thus less pressing —expect to do this with magnet 2

12. December 14, 2009Technical Board:Zisman12 RFCC Module (1) First two cavities have been delivered to LBNL —not yet “ready to go” o need processing (electropolish) at LBNL —remaining three cavities will be available soon o vendor already pressing for “option” order of five more cavities –this would be a Step 6 commitment Visited HIT last week to update plans for coupling coils —cold-mass production contract not yet placed with vendor o hold-up has been lack of complete set of fabrication drawings –resolved remaining issues for cold-mass drawings at meeting  last remaining step needed to place contract —some organizational changes o local HIT Project Manager will be Feng-yu Xu o Chief Engineer will be Li Wang (makes all technical decisions) o Prof. Chen (IHEP) will be liaison with Qi Huan Company

13. December 14, 2009Technical Board:Zisman13 RFCC Module (2) Goal to have Qi Huan contract for cold mass fabrication in place by ~March 2010 —considered a “make or break” milestone! o hard to see MuCool CC delivered before next summer In parallel, pressing to make HIT test facility operational —cryogenics issue —plan is to o get system modified o complete test of large coil (validates system) o use facility to test and train the three cold masses built by Qi Huan —dates for these still to be negotiated Generating revised Addendum to MOU to formalize plan —anticipate that magnet cryostats will become U.S. responsibility o expensive, but believed to be the best decision in terms of schedule

14. December 14, 2009Technical Board:Zisman14 Summary Seeing some light at the end of the tunnel —too early yet to tell whether it’s simply an oncoming train