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MICE PM report
• Target News• Outcome of Spectrometer Solenoid Review• New plans for Steps II & III• RF Power news
MICE CMPB, 4th December, 2009
Target News
• Online target working well• Now part of routine MICE shifts• Regular inspections, nothing to
report• Offline target/re-engineering going
OK• T3, all new parts are made except
bearing liners• Waiting for plastic bearing material,
Torlon/Vespel• Quite clear now that DLC coating of
metallic bearings is problematic, so have dismissed it
• Also DLC on DLC working in vacuum not such good idea
• First thing is to re-build T2 with plastic bearings and run it and see......
• Some minor open issues with plastics, but nothing thought serious2
Target news
• Plans and Dates (only based on informal discussion):• Mid January – aim to have T2 rebuilt with Plastic bearings• Mid January – March – Run T2 and then assemble T3 in
identical format if worth doing• Easter shutdown – aim to have two identical targets to
resume on-line/offline programme
• Stator considerations:• In parallel to above, stator QA programme is
underway:• Mechanical field survey rig (G.Barber) to assess magnetic
assymetries• ASD at RAL have been asked to help Sheffield group with
precise coil winding – square conductors and precision coil formers and uniform vacuum impregnation
• Worry is that Jason Tarrant leaves MICE in January........
3
Outcome of the Spectrometer Solenoid Review
• Very productive review held at Berkeley on 18th, 19th November, chaired by Pasquale Fabbricatori
• Briefly the important points are:• The overall thermal balance of the magnet is still not
completely understood, but this is being addressed by an ANSYS model and more experimental data
• Given the circumstances and schedule constraints, the addition of a fourth single-stage CCR to the HTS lead area is the right thing to do
• Operating margin of magnet two to be measured during cooldown
• The more complete fix to magnet one should be continued with
4
Spectrometer solenoid
5
Spectrometer Solenoid
Dates and decision points:– December – cooldown and training of magnet #2– Mid January, 2010:
• Magnet perfoms against acceptance criteria• Deliver to FNAL for field mapping, then RAL by mid April,
or:• Fails to meet acceptance criteria, so:• More complete fix required, then approx ten months’
work• Likely outcome here is that magnets one & two deliveries
converge
Important to remember: neither scenario will get Step II taking data before August 2010 (long ISIS shutdown)
So, the plan will have to change........
6
New plans for Steps II & III
• At MICE TB this Monday, agreed that STEP II is abandoned
• And that we go straight to STEP III and have it ready for data-taking by February, 2011 (end of long shutdown)
• The scientific case for Step III.1 (LiH solid absorber is re-visited)
• Yet to be agreed by MICE EB – next week• FC #1 will arrive July ‘10, will need storage, but in reality
the ‘spare’ time will be very useful• Actions:
• Means we integrate two magnets in parallel• More space required, opened negotiations for R79• Installation staff profile will look different• Top-level schedule to be re-built around these dates
7
RF PowerLifted from Andy Moss!
• Retest of medium power amplifiers have been done in the last month
• Electrical checks of large amplifier auxiliary electrical systems underway
• CERN HT connection used to speed up testing
• Connecting together medium and large power amplifiers
• Should have results of testing with RF in December for entire system into test load8
RF Power
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This is what we have to fit in R5.2,More complex than it was, this is a huge unknown!Really need to get on with design work as early as we can
RF PowerPresent RF project plan:• Test large 116 amplifier • Design hall coax in detail and work out how to fit it all in
space for steps 5 and 6• Assemble CERN amplifier and test with current power
supplies• Autumn 2010, move first amplifier system to MICE hall
and install
Conclusion:• Large amplifier ready and will re-commission to 1MW using old
tubes • Will run for as long as possible to develop understanding and look
for weak points • CERN amplifiers on site awaiting build• Hall layout needs careful work • search for smaller key coax components if possible• Two new TH116 tubes have been delivered to DL, two more due
soon 10