PM report International MICE programme

1. PM reportInternational MICE programme • MICE Hall update • Schedule planning and considerations • Magnetic shielding update • Liquid hydrogen system • Focus coil delivery and acceptance and magnet integration • Completion of spectrometer solenoids • Coupling magnet delivery plan Andy Nichols, STFC, UKNF/MICE OsC, 13-7-12

2. MICE Hall Overview • Moving floors and infrastructure now ready for Step IV • Fully automated test with helium of LH2 system complete • Target and decay solenoid are reliable, but DS PSU & QP scheduled for upgrade this year • A/C units re-positioned and re-ducted – success at last! • Sub assemblies for South mezzanine mods are made, need to fit after LH2 testing • Main hall PPS now in routine use • Space continues to be a major problem for the project • Integration area established in R9, but not complete answer...... • Complex helium windows delivered • Virostek plate shielding trial assembly is largely complete

3. Helium Window in metrology Virostek shielding dummy assembly 1.2 tonnes

4. MICE SCHEDULE update February 2012 V1 As agreed and presented at CM32 m Run date: STEP I EMR run Q2 2012 STEP IV Q4 2012 and 2013 Under construction: STEP V STEPVI NB: target date 2016

5. STEP IV Step IV ready...Q2, 2013 But subject to review due to SS delivery

6. Key schedule drivers Magnetic shielding of local equipment is a major consideration for Step IV Our baseline appears to be in tatters ie, even if we accept that baseline, extensive and heavy additional shielding is required But other options present themselves: Position everything at or near the West wall in R5.2 Make use of space behind North shield wall Any of these options has a schedule and cost implication and we have to do one of them Also, mundane but important: the world shortage of LHe Already affecting the spectrometer solenoid commissioning And likely to affect the Focus Coil

7. Key schedule drivers HTS leads of Spectrometer solenoid #1 have recently failed Likely 3-6 month delay for warm-up and repair This is stop-press news, cannot be expected to have a plan yet Focus coil has slipped badly, but is off critical path for now But it’s independent in R9 anyway

8. Background toMagnetic Field Shielding Issues (cntd) Mike Courthold/Vicky Bayliss • Previously it was assumed that shielding various magnetically-sensitive items would simply be a case of taking the prediction for the field in air, and employing a suitably-thick Mumetal screen. • However, when items such as air-conditioning units and cryocooler compressors were modelled, it became apparent that the magnetic field was massively enhanced on the surface of such steel cabinets from typically 300 Gauss (30 mT) to 1.7 Tesla • In hindsight, this effect should have been expected, but was overlooked by those performing the various analysis tasks, and also by various peer reviews, over more than seven years • The oversight had at least been identified before the arrival of any Cooling Channel magnets, and work began in earnest to quantify the problem and find engineering solutions, ideally for Steps IV to VI, but at least for Step IV.

9. Step VI Solutions Mike Courthold/Vicky Bayliss • Some thought has been given to Step V1: • Initially the intention was to find solutions for both Step IV and Step VI, to avoid having to repeat work later. However, initial analysis showed that this would be challenging, for the following reasons: • For example, up to 80mm US1010 ion and 10mm Mumetal is required to shield a compressor in its current position. • Also, given the space constraints in the hall, space required for additional shielding will need to be considered. • For example, it was intended that there would be seven magnet control racks under the north mezzanine, but with shielding there would only be enough space for five. • Consequently, MICE TechnicalBoard decided that the focus should be on finding a Step IV solution • Consequentially , it will be necessary to find new shielding solutions and/or relocate items for Step VI

10. Conclusions Mike Courthold/Vicky Bayliss • Magnetic Field distortion • Previous analysis and reports overlooked massive distortion in magnetic field profile caused by presence of ferrous objects - including the magnetic shielding itself • EG: Magnetic field in air in compressor locations ~ 30mT, which becomes 1.7T when ferrous content of cabinet and shielding taken into account. • What about a partial yoke • Forced to reconsider possibility of partial yoke around Cooling Channel magnets • Substantial issues re beam physics, forces, weight, and access for services and maintenance, etc. • Focusing on a Step IV solution • Will still require considerable engineering compromises & effort to achieve, as well as substantial additional analysis

11. Liquid hydrogen delivery Good progress under the leadership of Steve Watson of STFC Full functional test with helium a success Full operation of control system proven for first time Even included a copybook recovery from an unplanned power outage But there has been some schedule slippage... Administrative rather than technical Next step is full hydrogen test Need to staff with three-shift system and suitable level of expertise And agree with ISIS Director-level approval required We got all this last week Programme starts on July 23rd Including float takes 28 days Completion is major objective for Step IV

12. Steve Watson Pump enclosure Vent system Turbo pumps Gas panel Purge gas bottle store Transfer line Hydrogen bottle store Test cryostat

13. Absorber Focus Coil Tom Bradshaw • Cold mass is fitted in vessel • Radiation shielding and MLI fitted • Cold mass is aligned • Minor variations noted by Integration engineer • Under-performing cryocooler has been returned from makers • Delivery slippage to early August, 2012 • Urgently need to de-mystify... • R9 nearly ready • Five Tesla staff have received STFC safety induction • R9 Operation will be under control of Roy Preece

14. HTS Lead thermal link Tom Bradshaw Some off-line measurements are being made on the thermal link between the HTS leads and the cryocooler mid stage. This is a critical joint. Found that Cu/Stycast/0.2mm FR4/Stycast/Cu joint is not as good as sandwich with 50µm Kapton Kapton is ~ x2 better than the FR4 and can withstand 4kV • Open design issue from Tesla – especially relevant given what we know about the Spectrometer solenoid

15. R9 Facility Tom Bradshaw

16. Completion of spectrometer solenoids Assembly of the first magnet completed during early 2012 Team assembled at Wang NMR for cooling and powering DL controls hardware (and staff) shipped out for testing Evacuation went slowly but carefully, due to water vapour in MLI mainly Cooling went very well and quickly, excess of cooling power, as recommended by review committee worked as predicted Powering commenced in stages, with training quenches at various points Magnet reached ~245 amps and quenched Suspect HTS lead has failed again No choice but to warm up, remove turret and investigate Likely to be 3-6 month delay, but too early to make firm plan

17. SS support structure made in UK To help schedule – will be delivered Next week Powering tests at Wang NMR

18. Coupling magnets Much work done by Steve Gourlay and Alan Bross and their colleagues: Test coil cooling tubes welded LHe reservoir fabricated and fitted Test facility at FNAL well advanced Successful cryostat review in February Mostly signed off the engineering drawings, but with some recommendations Manufacturing plan is taking shape: Likely to manufacture parts for cryostat in US Favourable quotation received from LBNL Good news, monitoring will be easier

19. Cryostat and Staging Area at FNAL R. Carcagno, FNAL Staging Area: Aluminum frame construction, will be used to suspend top plate while coil is attached to it Vacuum Vessel: Passed Leak Check, MLI installed

20. Top Plate and Test Stand Cryo Piping R. Carcagno, FNAL Installation of top plate components in progress Top Plate Cryo Piping ~ 80% complete

21. Project Schedule(Updated June 2012) R. Carcagno, FNAL LBNL delivery of the cold mass to Fermilab (7/31/2012) is on the critical path Test is expected to start October 1, 2012

22. Next steps: Minuted extracts from discussions at the recent MICE CM33 EB It has been decided that the Cryostats will be built at LBNL, the scheme in which part were constructed in China and the assembly at a vendor or lab in the US seeming too complicated. The MICE EB welcomed this decision. The following step of construction is the assembly of the magnets from coils tested at the STF at Fermilab, and from the assembled and vacuum-tested cryostats. There was a fully loaded estimate shown by Alan Bross for Fermilab to carry out this operation for all tree coils: estimate is 2M$ for the first MUCOOL magnet and 1.8M$ for each of the two MICE magnets. The construction plan foresees the delivery of the last magnet in the early part of 2015. Hermann ten Kate from CERN had proposed a provisional estimate for this work to be carried out by the CERN ATLAS magnet group (the group who assembled and tested the ATLAS toroids). The estimate assumes that CERN authorizes (as in-kind contribution) the work of the three senior magnet experts and the use of the facilities. The estimate is reproduced in appendix. Hermann ten Kate was aware of the job descriptions for the work to be carried out at Fermilab and evaluated the equivalent work. The resulting estimate was 1.25MCHF with an uncertainty of 0.25MCHF, (1CHF~1US$), and 18 months upon reception of the parts, for the two MICE magnets. UNIGE could commit to request -- and estimated good prospect -- for a Swiss contribution to this project of the order of 0.2-0.3M$. This proposal is of course extremely interesting because it brings new resources to the collaboration. But it is still too early to make a real plan for MICE That has been requested for the MPB in October