MICE Collaboration meeting at CERN March 28 – April 1, 2004 MICE Cooling Channel --- AFC Module...

transcript

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:

• 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:

• 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:

• 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:

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:

• 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

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

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:

• 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

6-10 Windows by (USA)

20K Gas-He Test at

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

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

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

Detail engineering:

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

Detail engineering:

Cost estimate and schedule of work Response to Safety Review committees comments

A progress update:

R & D issues

Detail engineering:

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

Detail engineering:

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.

MICE Collaboration meeting at CERN March 28 – April 1, 2004 MICE Cooling Channel --- AFC Module...

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