1. MICE Collaboration meeting at CERN March 28 – April 1, 2004 MICE Cooling Channel --- AFC Module work group report Wing Lau – Oxford

2. A progress update: Design & Engineering issues:- Interface scope and responsibility Interface scope is now defined. Each package supplier understands his scope of supply and responsibility NIU/IIT supply KEK supply Oxford / RAL supply

3. A progress update: Design & Engineering issues:- Interface scope and responsibility Interface control via a global reference system --- Drawing convention to separate standalone items from interface item -- A global reference system (Coat hanger technique) to aid checking of interface compatibility

4. A progress update: Design & Engineering issues:- Interface scope and responsibility Interface control via a global reference system Feasibility study of using Cryo-Coolers The use of Cryo-Cooler for the AFC magnet cooling is proofing feasible We have to do further work to determine whether a single cooler or two cooler arrangement is best for the job Sumitomo SDRK-415-D GM cooler (1.5 W at 4.2 K) can fit the bill. A pulse tube cooler from Cryomech is an alternative choice.

5. A progress update: Design & Engineering issues:- Interface scope and responsibility Interface control via a global reference system Feasibility study of using Cryo-Coolers Detail design & engineering for module connection Various connection schemes have been examined. These are: However recent development may encourage the module to be fixed individually on the floor LBL scheme The LBL design RAL scheme

6. A progress update: Design & Engineering issues:- Interface scope and responsibility Interface control via a global reference system Feasibility study of using Cryo-Coolers Detail design & engineering for module connection Various connection schemes have been examined. These are: The LBL design However recent development may encourage the module to be fixed individually on the floor Reduction in imbalanced magnet forces Ability to align the magnet to the vessel true centre Existing RAL survey proposal also in favour of this arrangement

7. A progress update: Design & Engineering issues:- Interface scope and responsibility Interface control via a global reference system Feasibility study of using Cryo-Coolers Detail design & engineering for module connection Magnet force estimate Jim Rochford at RAL together with Holger at Oxford have been doing a lot of reiterative calculation on magnet forces at various operating scenarios and fault condition. However, the recent repositioning of the coils by Mike Green has resulted in significant reduction in the imbalanced forces. This reiterative calculation will continue until we are satisfied with the results

8. A progress update: Design & Engineering issues:- Interface scope and responsibility Interface control via a global reference system Feasibility study of using Cryo-Coolers Detail design & engineering for module connection Magnet force estimate Tolerance & alignment issues This is still being studied. The Cold Mass support design allows us to align the magnet to the vessel true centre which in turn can be aligned to the beamline. We will develop the idea further in the coming weeks and this may change how we support the modules

9. A progress update: R & D issues Window measurement and burst tests The first window is now machined and is ready to be measured by photogrammetry. Burst test will follow

10. A progress update: R & D issues Window measurement and burst tests KEK Absorber cryostat and mechanical seal tests MICE absorber (No.1) will arrive soon. Horizontal test cryostat will be designed and fabricated at KEK. MICE absorbers will be tested at KEK W/ cold gas-He at 10-20K. MICE absorbers will be shipped to RAL with sensors and real windows (ready to use).  PROPOSE L-H2 test at FNAL/MTA with a spare MICE absorber.  PROPOSE Thermometers/LH2 level sensors and wiring/connecters are existing. 3-5 Bodies by (KEK) 6-10 Windows by (USA) 20K Gas-He Test at (KEK) Test check absorbers & assemble in MICE at RAL L-H2 Test at MTA with a Spare Body and Windows

11. A progress update: R & D issues Window measurement and burst tests KEK Absorber cryostat and mechanical seal tests Welded window tests Status of test vessels: 1st vessel is waiting to have the threaded bayonet milling. 2nd vessel is having the vacuum and pressure port machined, then milling of the threaded bayonets will be done -- next week. Welding test samples are machined & ready Thermocoup le

12. A progress update: R & D issues Window measurement and burst tests KEK Absorber cryostat and mechanical seal tests Welded window tests Detail engineering: Cold Mass support design The detail design is in advance stage. We are carrying out detail stress analysis to establish how the magnet moves when individual support is adjusted

13. A progress update: R & D issues Window measurement and burst tests KEK Absorber cryostat and mechanical seal tests Welded window tests Detail engineering: Cold Mass support design Coil support tube design The one piece bobbin design with the latest coil configuration Is proving acceptable from both mechanical & thermal points of view.

14. A progress update: R & D issues Window measurement and burst tests KEK Absorber cryostat and mechanical seal tests Welded window tests Detail engineering: Cold Mass support design Coil support tube design Documentation issues Cost estimate and schedule of work This is now prepared and is in the safe hands of our Project Manager Paul

15. A progress update: R & D issues Window measurement and burst tests KEK Absorber cryostat and mechanical seal tests Welded window tests Detail engineering: Cold Mass support design Coil support tube design Documentation issues Cost estimate and schedule of work Response to Safety Review committees comments

16. A progress update: R & D issues Window measurement and burst tests KEK Absorber cryostat and mechanical seal tests Welded window tests Detail engineering: Cold Mass support design Coil support tube design Documentation issues Cost estimate and schedule of work Response to Safety Review committees comments Response to the Safety Review comments ~ draft copy ~ A draft report on our point by point response to the questions raised by the Safety Review Committee has been prepared There are two areas which need further information:- Once these are received, the report will be reviewed the group before it is released for issue. Clarification + diagram on Hydrogen Safety system Detail descriptions of the Control system

17. A progress update: R & D issues Window measurement and burst tests KEK Absorber cryostat and mechanical seal tests Welded window tests Detail engineering: Cold Mass support design Coil support tube design Documentation issues Cost estimate and schedule of work Response to Safety Review committees comments Draft Re-baseline document The re-baseline document is 90% complete. The following information is still outstanding:

18. Detail description of the C&I design and arrangement Product details / category of the control instruments applicable in the AFC module Work schedule of the Window test and supply Work schedule of the Absorber body, mechanical seal and other relevant equipment Re-baseline document on the AFC Module Safety issues & safety considerations to be included The re- formatting of the Word document as it is nor readable by some Word browsers

19. Summary The basic project infrastructure of the work packages within the AFC module is now in an advance stage. We still need further effort in the C&I area The use of Cryo-Cooler is looking promising and further effort is needed to make sure that Safety of the system is not compromised. The module connection together with the module supports are undergoing a revision and we should firm up the idea shortly so that we can get on with the detail enginering. The R&D work is progressing, albeit a little slower than planned. Interface with the detector module supplier is progressing and further effort is needed to bring this to a reasonable stage where detail engineering work can start.