Standalone Commissioning Plan in MICE Hall K Ronald, University of Strathclyde For the MICE RF team 1MICE RF Review 9th Sept 2016

MICE High Power RF systems 2 MICE HPRF system requirements have changed Fewer cavities, no coupling coil Required operational date on the beamline is Summer 2017 Requires early commissioning of the hardware: Starting Aug 2016 Enables demonstration of ionisation cooling with re-acceleration First results complete before end US fiscal year 2017 Cavity modules very similar to the SCTS unit being run now at FNAL Possible to power these as standalone units MICE RF Review 9th Sept 2016

Proposal for Full RF System Tests 3 Rationale From STEP IV the project becomes increasingly focussed on RF systems Tight time schedule for demonstration experiment Require rapid commissioning of whole system Provides opportunity for full shakedown of RF system Delivers pre-prepped cavities by end 2016 Opportunity to perform system shakedown Address MPB Nov 14 recommendation on coupler conditioning Cavities derisked already by tests at MTA Matched the MICE duty cycle Attained higher gradients BUT at shorter pulse duration MICE RF Review 9th Sept 2016

Cooling Demonstration: Preparation Programme 4 From STEP IV the project becomes increasingly focussed on RF systems First cavity expected May 2016 Opportunity HPRF Tests, start Autumn 2016, est. 8 weeks for first cavity As soon as amplifier no. 1 is available Cost Need to build discrete control racks for each system Change from single integrated control system Feasible given sufficient EE Resource through 2015 & 16 Will delay amplifier No. 2 availability Requires LLRF control Requires UK/US RF experts through 2016 to undertake experiments Second cavity commissioned partially in parallel, ready for test as soon as 1 st cavity completed Test of second cavity (shorter timeframe) Subsequent test of Amplifier 2 with cavity 2 MICE RF Review 9th Sept 2016

Preparation: Location of test stand Cavity can be installed parallel to upstream spectrometer solenoid Installation between ISIS run cycles Opportunity to test vacuum pump down and prepare cavity Transmission lines can be run from amplifier station no 1 Shielding (if reqd.) can be provided across hall near upstream SS MICE RF Review 9th Sept 20165

Flexible coax Line Trimmers Hybrid Splitter Directional Coupler in each line 4616 Pre Amplifier TH116 Amplifier 500kW Load Directional Coupler 6 inch RF network 6MICE RF Review 9th Sept 2016 Use same frame mounted hybrid support- mount from wall instead of from yoke Use elbows to run section of transmission line along the top of the shield wall to amplifier Mount transmission line from shield wall Introduce ‘chicane’ to make the electrical length the same number of wavelengths

Prerequisites: MICE High Power RF drive systems 7 Amplifier System No. 1 First triode remains installed at RAL Build on previous installation for TIARA tests Reinstall Tetrode No.1 with Modulators No.1 and control racks No. 1 by Autumn ’16 Require automation and control systems Require SF 6 system, Cavity auxiliary systems- cooling Require LLRF system Note there may be conflict with key people required for installation at RAL and commissioning at DL Will require mechanical modification to the Mezzanine Prove with < 1 Month of test operation into resistive loads Amplifier System No. 2 Project completion of Daresbury proving trials by Summer’ 2016 Installation can commence from July ‘16 to Jan ‘17 (preliminaries need not await July ‘16) Build on experience from installation of system No. 1 Will require new wiring ‘loom’ installation, additional cooling water panel and mechanical modification to the Mezzanine Prove with 1 Month of test operation into resistive loads MICE RF Review 9th Sept 2016

Amplifier No 1 Programme: Timeframes 8 April 2015 Definition of controls and automation system/interfaces/interlocks Draft documents under review Late 2015/Early 2016 Amplifier no 1 PSU automation system completion Commission and test amplifier No. 2 with No. 1 racks Test automatic/remote control systems Aug 2016 Re-Installation and test into loads at RAL Key resources, Electrical Engineering effort Control and monitoring RF & EE system specification/RF & EE system testing 2-3 months of test operation through 2015 Team drawn from MICE RF engineer, DL RF engineering Imperial and Strathclyde (4 RF scientists/engineers) MICE RF Review 9th Sept 2016

Cavities: Pre-Installation 9 Cavity Module No. 1: Arrival and Installation Assumed to arrive under purge and fully assembled May ‘16 Assume cavity will not require any further baking In advance, auxiliary systems will be prepared in MICE hall Clean room: Essential in case any intervention is required Independent cooling loop for each cavity with tight thermal regulation LLRF tests to verify safe transport and arrival Install cavity next to shield wall opposite U/S SS, special distribution network Install vacuum pumps and pump cavity ready for operation late Summer 2016 (1-2 months ) Cavity Module No. 2: Arrival and Installation Assumed to follow same pattern as Cavity module No. 1 with object of completion at Oct 2016 MICE RF Review 9th Sept 2016

Cavity No 1 Pre Installation Timeframes 10 May 2016: Module delivered assembled, baked, LLRF tested from LBNL Re-test tuning Exercise Tuners Acceptance Criteria Prepare for evacuation: pump, gauge installation: Prepare cavity diagnostic systems, control systems, cooling, Install in upstream space against shield wall (parallel to upstream solenoid May require install X-ray shield (est ~80 microSv/hr at 3m) Evacuation, Install & tune overhead RF lines, concurrent with evacuation Retest of cavity tune after evacuation, Can complete around July/Aug 2016 MICE RF Review 9th Sept 2016

Cavities: Pre-Commissioning 11 HPRF Tests of Cavity No. 1 Initial tests on a single cavity, using drive system No. 1 Sept‘16- Oct ‘16, est 2 months for complete tests HPRF Tests of Cavity No. 2 Nov ‘16- Dec ’16 using drive system No. 1 Leave in situ until last possible moment Opportunistically test with drive system no. 2 if timing is good If timing does not work out then this test will be ‘in beam line’ Minimal additional risk associated with skipping this step MICE RF Review 9th Sept 2016

Cavities: Pre-Commissioning 12 System Tests of cavities Test LLRF driving cavity at low power Validate tuner/LLRF close loop control Est. 1-2 weeks-need not wait for HPRF to be ready Drive cavity with low output power from triode Operate triode at reduced bias voltage to ensure stability Increase drive power, monitoring for breakdown events- Compare performance of amplifier chain into reactive loads to resistive loads Tune amplifier settings/line lengths if required to deliver power efficiently Check forward, reflected and coupled signals and compare to MTA tests and theory Validate cavities are behaving as expected Verify triodes unaffected by reactive response Test tuners are able to hold cavities on tune on long pulses Test cavity coolant system is stable In event of coupler/cavity conditioning events Slowly and progressively increase drive power Based on MTA experience Estimate 2 months for first cavity and 1 month for second cavity MICE RF Review 9th Sept 2016

Cavities: After Pre-Commissioning 13 Pre-requisities Completion of tests on each cavities with RF amplifier No. 1 Ideally also pre-commissioning tests with Amplifier No. 2 and Cavity No. 2 After tests, cavities left under purge N 2 gas Minimises risk to Be windows See Colin’s talk for installation Installation of final RF distribution network (planned for Aug ‘16- Feb ‘17) Brief notes on final installation (Colin’s talk) Should attempt to keep conditioned cavities as clean as possible Keep under purge gas or move into beamline and pump ASAP Absorber and spool sections ‘beam line vessel’ should ideally be pumped separately Ensures they are reasonably clean before the cavity outer jacket is exposed to them MICE RF Review 9th Sept 2016

Cavities: In Line Commissioning 14 Commissioning without B field Ideally cavities should be HPRF tested on beam line before yoke is complete In case any intervention is required Estimate <1 month operation of both cavities together Commissioning with B field Requires completion of Yoke and re-commissioning of all magnets Note ONE magnet only will be added to the STEP IV set Yoke plate final installation est ~ 1 wk Commissioning of magnets will follow basically the the STEP IV commissioning plan Being executed at the present time Tests of the cavities with magnetic field and all systems, say 2wks- 1mnth In parallel with magnet commissioning if possible MICE RF Review 9th Sept 2016

Pre Commissioning: Summary 15 Drive Commissioning Timetable Amplifier No. 1 with automation installed and operational by Aug 2016 Amplifier No. 2 with automation installed and operational in course of 2017 LLRF, amplifier and cavity control systems operational by Aug 2016 Cavities Arrival May 2016 Cavity no. 1 ready for standalone tests by end Summer 2016 : Complete by Nov 2016 Cavity No. 2 ready for standalone test by Oct 2016 : Complete by Dec 2016 Cavity installation to beamline Spring ’17 MICE RF Review 9th Sept 2016