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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........

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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

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Spectrometer solenoid

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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........

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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

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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

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