1. Spectrometer Solenoid and RFCC Update Michael S. Zisman Center for Beam Physics Accelerator & Fusion Research Division Lawrence Berkeley National Laboratory MICO Meeting—RAL September 7, 2009

2. MICO:Zisman2 Spectrometer Solenoid Status (1) Vendor working on both magnets in parallel —magnet 2 being modified to accommodate additional 1-stage cooler —magnet 1 being modified to accommodate 4 th 2-stage cooler o with room for a single-stage cooler as well, if needed Single-stage cooler ordered and expected at vendor about mid-October Cooler tests have been performed on three new 2-stage coolers —all provide ~1.2 W in recondensing mode o same results as found in tests of previous devices

3. September 7, 2009MICO:Zisman3 Magnet 2 Turret Mods Magnet 2 turret partially disassembled —being extended to accommodate new 1-stage cooler beyond HTS leads New cooler goes here Mount for HTS leads

4. September 7, 2009MICO:Zisman4 Cryocooler Stage 1 Connections Cryocooler connection pieces made from OFHC copper —straps connect plates to permit flexible mounting of drop-in coolers o additional copper plate will be used to attach new cooler to leads

5. September 7, 2009MICO:Zisman5 Vacuum Feedthrough RT-70 K feedthrough will be tested to confirm thermal properties

6. September 7, 2009MICO:Zisman6 Magnet 1 Modifications Changes to permit 4 th 2-stage cryocooler are proceeding in parallel with magnet 2 fixes —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

7. September 7, 2009MICO:Zisman7 Magnet 1 Cold Mass Additional connection for 4 th 2-stage cryocooler has been created New connection for cooler added

8. September 7, 2009MICO:Zisman8 Magnet 1 Shield Corresponding hole added to shield —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 –extra heat load from higher temperature at this point is burden for stage 2 of coolers  probably more of an issue than bulk radiation load New connection for cooler added Area where cold- mass support intercept attached

9. September 7, 2009MICO:Zisman9 Spectrometer Solenoid Plans Continue with magnet 2 training to reach 265 A or beyond 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

10. September 7, 2009MICO:Zisman10 RFCC Module (1) Cavity fabrication mostly completed (5 ea.) —waiting for special order of tubing for cooling lines o need mill run for this, as original supplier could not provide from stock —expect 5 cavities in hand by the end of this year Coupling coil delays continue —mainly due to administrative difficulty in getting production contract placed with vendor o HIT summer vacation prevented getting this done sooner —another issue is lack of complete set of fabrication drawings o ICST task, but it is not happening –anticipate need to augment ICST design effort with LBNL staff (DeMello)  “natural” solution for interface matters, but was not anticipated for routine production drawings o critical because vendor (Qi Huan) contract is “build to print” –MUST have drawings to proceed with vendor fab!

11. September 7, 2009MICO:Zisman11 RFCC Module (2) Hard to see MuCool CC delivered before next summer We are continuing to do what we can to expedite matters —“action at a distance” is a challenge o for Li Wang o for LBNL staff