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MICE Collaboration meeting at CERN March 28 – April 1, 2004 MICE Cooling Channel --- AFC Module work group report Wing Lau – Oxford
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MICE Collaboration meeting at CERN
March 28 – April 1, 2004
MICE Cooling Channel --- AFC Module work group
report
Wing Lau – Oxford
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
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
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.
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
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
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
Center Focus Coil Coupling Coil End Focus Coil #1 End Focus Coil #2 Matching Coil #1 Matching Coil #2 Detector End Coil #1 Detector Center Coil Detector End Coil #2
Longitudinal Magnetic Force
at 200 MeV/c (kN)
1550.1
85.7 -1554.1 2161.9 -137.1 554.6 152.8 31.9
-1357.2
0.0
85.7 kN = 8.8 tons
607.8 kN = 62.0 tons
-755.0 kN = -77 tons
Net Cold to Warm Force
* Note: the forces on the other half of the channel have the same magnitude but the opposite sign.
Center Focus Coil Coupling Coil End Focus Coil #1 End Focus Coil #2 Matching Coil #1 Matching Coil #2 Detector End Coil #1 Detector Center Coil Detector End Coil #2
Longitudinal Magnetic Force
at 200 MeV/c (kN)
2350 133
-2260 2205 220 63
1050 -21
-1430
0.0
133 kN = 13.6 tons
-55 kN = 5.6 tons
-118 kN = - 12.0 tons
Net Cold to Warm Force
* Note: the forces on the other half of the channel have the same magnitude but the opposite sign.
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
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
A progress update:
R & D issues
Window measurement and burst testsKEK 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
A progress update:
R & D issues
Window measurement and burst testsKEK Absorber cryostat and mechanical seal testsWelded 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
Thermocouple
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
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 designCoil support tube design
The one piece bobbin design with the latest coil configuration Is proving acceptable from both mechanical & thermal points of view.
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
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 Response to Safety Review committees comments
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
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 preparedThere 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
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
The re-baseline document is 90% complete. The following information is still outstanding:
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
SummaryThe 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.
