MICE Collaboration meeting at CERN March 28 – April 1, 2004

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

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

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

4. 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. 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 • A progress update: • Design & Engineering issues:- • Interface scope and responsibility • Interface control via a global reference system • Feasibility study of using Cryo-Coolers

5. LBL scheme Various connection schemes have been examined. These are: The LBL design RAL scheme • 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 However recent development may encourage the module to be fixed individually on the floor

6. Various connection schemes have been examined. These are: The LBL design • 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 Reduction in imbalanced magnet forces Ability to align the magnet to the vessel true centre However recent development may encourage the module to be fixed individually on the floor Existing RAL survey proposal also in favour of this arrangement

7. 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. • 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 This reiterative calculation will continue until we are satisfied with the results

8. 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. • 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 We will develop the idea further in the coming weeks and this may change how we support the modules

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

10. 3-5 Bodies by (KEK) 6-10 Windows by (USA) • MICE absorber (No.1) will arrive soon. 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 • A progress update: • R & D issues • Window measurement and burst testsKEK Absorber cryostat and mechanical seal tests • 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.

11. Thermocouple • 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 • A progress update: • R & D issues • Window measurement and burst testsKEK Absorber cryostat and mechanical seal testsWelded window tests

12. 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 • A progress update: • R & D issues • Window measurement and burst testsKEK Absorber cryostat and mechanical seal testsWelded window tests • Detail engineering: • Cold Mass support design

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

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

15. A progress update: • R & D issues • Window measurement and burst testsKEK Absorber cryostat and mechanical seal testsWelded window tests • Detail engineering: • Cold Mass support designCoil support tube design • Documentation issues • Cost estimate and schedule of workResponse to Safety Review committees comments

16. A draft report on our point by point response to the questions raised by the Safety Review Committee has been prepared Clarification + diagram on Hydrogen Safety system Detail descriptions of the Control system Response to the Safety Review comments ~ draft copy ~ • A progress update: • R & D issues • Window measurement and burst testsKEK Absorber cryostat and mechanical seal testsWelded window tests • Detail engineering: • Cold Mass support designCoil support tube design • Documentation issues • Cost estimate and schedule of work Response to Safety Review committees comments 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.

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

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

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.