The Alpha Magnetic Spectrometer

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• Magnet status S Harrison (30 min)
• Helium vessel at HBE H Bieri (15 min)
• Status of CGSE Y Shi, Zhang, A Grechko (30 min)
• CAB Status H Cuesta (10 min)

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• AMS Superconducting Magnet
• progress over the last 3 months
• April 2007
• Steve HarrisonScientific Magnetics

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• Magnet
• Helium vessel
• Magnet test facility

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Magnet
In January the magnet was mechanically complete,
and work had just started on the inter-coil
links, the cryogenic plumbing, and the heat
shunts.
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Dipole heat shunt
Racetrack heat shunt
Cool down loop
Conductor stabiliser
Superfluid cooling loop
Steel
Cool down loop
Copper
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Inter-coil conductors had been made from
ultra-high purity aluminium, copper-plated for
soldering.
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Coil ends
Unsupported length (max 30 mm)
Trial fit-up was under way.
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The geometry of the flight cooling loops is not
suitable for use in the test cryostat, so
simplified loops are required.
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Both cooling loops had been mechanically attached
to the magnet, but not yet connected to the heat
shunts.
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The magnet joints have now been soldered together
and insulated with Kapton
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and protected with a PTFE spiral overwrap.
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Instrumentation and quench heater wiring has been
completed
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with a final set of quench heaters installed on
the outer coil formers.
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Mounting points on the coils for extensometer
attachment.
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For soldering on the heat shunts
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the magnet had to be rotated
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to allow the soldering to be carried out
horizontally.
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Helium Vessel
In January, the helium vessel lower half had been
received from HBE and was being worked on at
Culham.
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One of the feedthroughs had a small leak, and had
been cut out for repair.
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A new weld set-up was designed and trialled
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and a replacement feedthrough was welded into
the tank by the SCL welder at Culham.
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The new weld was successfully qualified, X-ray
tested
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and leak tested
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allowing the remaining components to be mounted
inside the vessel.
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While the vessel was at Culham, a trial fit was
carried out to check that the magnet will fit in
the bore.
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There is not a great deal of room to spare.
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The profile of the weld between the vessel
central ring and cylinder was measured.
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Instrumentation inside the vessel was thoroughly
checked.
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Finally the vessel half was packed in a clean
room bag for shipping back to HBE.
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The tank left Culham in the rain.
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The completed tank was returned from HBE on 3
April. The truck penetrated one of the site
ducts.
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The tank itself was never at risk
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although it had to be recovered by mobile crane.
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The vessel box was eventually transferred into
the SCL workshop and turned over.
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The vessel was lifted out
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and carried across the workshop
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to the clean room for basic cleaning.
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Next we have to check that the vessel will fit in
the 1.8 K leak test system.
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Liquid nitrogen vessel fits in the bore of the
helium vessel.
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The helium vessel was lifted out of the clean
room and placed over a hole in the floor
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allowing the nitrogen vessel to be lowered in.
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There was a small discrepancy between the leak
test rig and the helium vessel, so minor
modifications have been made to the test rig.
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Now the vessel will be mounted in this frame for
detailed cleaning before assembly into the leak
test facility.
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Magnet Test Rig
Progress on the magnet test rig between October
2006 and January 2007 was limited because work on
the STA was given priority.
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The vacuum vessels and radiation shields were
nested together.
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The upper section containing the cryogenic
vessels was mounted.
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The dished ends were mounted on the inner vacuum
case (IVC) for leak testing.
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The magnet was turned axis horizontal for
mounting in the IVC.
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The magnet was picked up on a fork lift
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and carefully inserted in the test rig.
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The magnet suspended from the test rig supports.
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Mechanical mounting of the magnet is complete.
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Connections for superconductors, persistent
switch, instrumentation, and superfluid helium
are required.
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Here most of the connections are complete.
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Summary Rapid progress has been made with
preparations for the magnet test the test itself
is expected to start in May. Good progress has
also been made with the helium tank, and final
preparations are under way for the 1.8 K leak
test.