1. MICE VC145 15-12-2011 Alain Blondel 1 NEWS and RF review

2. MICE RF power Review 7 December 2011 Reviewers Ralph Pasquinelli Fermilab Kevin RonaldStrathclyde Pete McIntoshSTFC DL Mark KeelanSTFC RAL Mike WoodwardSTFC RAL Erk Jensen CERN – By phone Presenters Andy Moss (DL) RF power station Alan Grant (DL) RF layout Steve White (DL) RF controls Review Charge To review the MICE RF power installation and distribution layout in terms of: Suitability of components, materials and equipment for the MICE application and performance specification so that a major purchase can be confidently made Specifically address RF control and monitoring and measurement of RF phase, amplitude and frequency Compatibility and integration of the entire system with its surroundings Ease with which the system can be assembled and tested Suitable flexibility to adapt to each of the discrete MICE assembly step s Report to MICE before Xmas

3. Highlights of presentations

4. Andrew Moss Principle Andy Moss

5. Andrew Moss Vacuum RF Coupler Loop Photo- Multiplier 4 1/16” Coax Section Flexible line section 6 1/8” t0 4 1/16” Coax Transition 6 1/8” Matched Tee Dual Directional Coupler MTA with 201MHz MICE cavity on test Slides courtesy of Al Moretti, Fermilab Reality Andy Moss

6. RF Layout – view behind shield wall 6 Alan Grant

7. RF Layout – view from cooling channel side 7 Alan Grant

8. Predicted hall layout for RF components Andrew Moss Comment: 4 Amplifiers go to 8 cavities A1  C1&C2, A2  C3 and C4 etc. etc. Could it be sufficient to consider the cavities in pairs with relative phase adjusted for central muon velocity and adjust pair’s phase at driver level without the cumbersome trombones Andy Moss

9. Access & Egress 9 Discussed access & egress with Fire Safety Officer. Agreed this arrangement would be acceptable. NB: This generated substantial discussion and needs to be revisited: reviewers wondered if access to maintain was practical enough Amplifier cannot be lifted. Alan Grant

10. MICE RF Design Review December 2011 10 RF HV Power Supplies - Components Crowbar (38 kV Thyratron) TH116 Circuit (lower part) 38 kV PSU – rear view20 kV PSU & Aux. rack – front view 38 kV PSU – resistor bank HV PSU Control Unit 38 kV PSU – 1 MW RF output Chris White

11. RF Control & Monitoring System MICE RF Design Review December 2011 11 Network/ Controls Rack VME Crate Canbus modules DAC/ADC modules EPICS Server Heater Controller (4616) 450V DC Bias PSU Digital signals/serial link 4616 & TH116 Aux. Racks PLC Crate (4616) Grid PSU (4616) Analog & digital signals Heater Controller (TH116) Analog & digital signals Interlocks Panel switches Water flow Compressed air pressure Heater V and I Interlocks Typical I/L PLC Crate (TH116) Digital signals/serial link Screen PSU (4616) Analog signals Enable Interlocks Chris White

12. MICE RF Design Review December 2011 12 Timescale Current work in progress: RF testing of System #1 with new 4616 and TH116 tubesNov 11 to Dec11 Future work (Step V): time-scales to be confirmed Assembly of CERN TH116 amplifier (System #2) ----------------------(July 2012) Test CERN amplifier at Daresbury -----------------------------------------(December 2012) Develop RF Control Systems Pack & ship complete system #1 to RAL --------------------------------- (January 2013) Install RF System #1 in MICE Hall ----------------------------------------- (May 2013) Test complete RF system #1 at RAL -------------------------------------- (September 2013) Construct & test 4616 #2 amplifier, power supply & controls Construct & test TH116 #2 power supply & controls Test complete RF system #2 at DL Pack & ship system #2 to RAL Install RF System #2 in MICE Hall Test complete RF system #2 at RAL Tasks in red are required for TIARA (deadline in brackets) Chris White

13. 13 Close out notes (A.Blondel, and M.-E.Shewry) “MICE is not ready to go to the RF superstore to buy a lot of stuff” Need another review when more detailed plan has been established for stepwise testing. Clock ticking with 6-9 month lead time Final triodes High Power T116 tubes are a concern. Need to review situation regarding Thales tubes with Andrew Taylor. MICE should address issue minimum gradient for studies vs what needed for final measurement RF system depends extensively on 4 inch coax for which 1MW level testing is needed. Need system test of 1MW RF system (one cavity with whole system) Perhaps RF cavity that is at Fermilab after cavity conditioned at 1.5MW level (or do it at RAL?)

14. Close out notes (II) Shield wall: 4616 AMP on top of mezzanine -- is it protected? MICE magnetic fields should have be studied (action to Preece and Courthold) Need beam physicist (Derun was not there) to have overview of RF system as a whole. Funding from STFC, MRI + TIARA is complicated and confused (Peter McIntosh) On controls: individual cavity frequency feedback loop control is needed (see with Derun) Tune cavities as pairs -- what we lose by design of tuning of individual cavities to middle of range ([ 0.985-1] ) we gain by getting rid of the trombones. Since there is no condition for step VI put as much of step VI as you can right away !

15. RF power: next steps -- important to integrate beam physicist in following discussions: (at least Derun) -- take stock of remarks by reviewers and revisit a few things -- integrate testing plan and re-draw plan -- re-establish schedule

16. News Run is taking place (very nice results!) Aims: 0. re-establish target performance and improve including beam bump 1: check performance of new TOF photomultipliers 2: try to estimate the contamination of pions in the muon beam 2.1 first scan in momentum tof criss-cross to establish response of pions vs muons at given value of TOF 2.2 use KL to identify a clean sample of pions. 3. Verify performance of CKOV and pion muon separation at high momentum 4. More checks on e+ e- time of flight difference (reverse solenoid or scan intensity) 5. Possibly try to symmetrize momentum distribution by moving pion momentum down 6. Possibly do last point of momentum emittance matrix

17. AGENDA Next analysis meeting: 22 December 2011 Next Video conference 19 January 2012 Next collaboration meeting: 8-11 february 2012 at RAL MPB: 8 March 2012 FAC: 19 March 2012

18. MICE CM31 wrap-up Alain Blondel 18 Some recommendations by MPB in July 2011: Recommendations (MICE is asked to report at the next MPB meeting 8 March 2012 on these) -Engage Chinese manufacturing partners during CC magnet testing and cryostat construction in the US - Monitor 2011 Milestones and report to the next project board on their follow up and achievement - Encourage project to evaluate more thoroughly step IV running - Continue to recommend priority to be given to RF cavity tests well before commissioning step V to reduce project risks - Recommend early soak test of RF power sources - Recommend incorporating enough instrumentation to minimize occurrence and consequences of system-wide magnet quench NB we don’t have to do everything they say, but we have to take it seriously and report on it.

19. MICE CM31 wrap-up Alain Blondel 19 Screen preview FOR NEXT MEETING (not exhaustive list) Spectrometer solenid cold mass is closed and about to be testing. FC magnet completed (cooled) and in time for delivery end of February CC drawings review passed. First scenarios for construction of CC magnets LH2 system tested with Liquid Hydrogen Results from December run: -- is CKOV telling pi/mu reliably at 300 MeV/c? -- is MAUS working on real data? Analysis group producing results, tracker reconstruction software Report from Magnetic shielding WG and reference time WG Establish run plan for step IV!

20. MICE VC145 15-12-2011 Alain Blondel 20 Next CM will be organized by -- Stefania Ricciardi -- Victoria Blackmore -- Alain Blondel -- Mary- Elizabeth Shewry -- registration call coming soon