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Status of the MICE RF System

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Presentation on theme: "Status of the MICE RF System"— Presentation transcript:

1 Status of the MICE RF System
K Ronald, University of Strathclyde For the MICE RF team MICE Project Board, 27th October 2015

2 MICE Project Board, 27th October 2015
Content Distribution network Detailed mechanical design work complete Ensures matching of electrical lengths Required parts identified and isolated from NSF procurement Ready for advanced RF tests Hangers designed and fabricated Delivered to Daresbury- ready for test assembly Status of RF drive system Progress in the testing of the amplifier chain Plans for delivery and installation of amplifiers Development of RF Controls & Monitoring systems Development of LLRF Status of cavity systems Test status and production of final modules Muon-RF phase determination Subsample technique demonstrates required accuracy Plans for a full system test at RAL MICE Project Board, 27th October 2015

3 MICE High Power RF system: Requirements
MICE HPRF system requirements have changed Two cavities, driven by two RF power amplifiers- 2MW output each Estimated gradient 10.3 MV/m- partial restoration of axial momentum Allowing for realistic LLRF overhead and losses Bracketed by two thin LiH absorbers, sandwiching main absorber Determine RF phase on transit of each muon Required operational date on the beamline is Summer 2017 Potential to pre-commission hardware: Starting Aug 2016 Exploit proposal for the RF cavities modules delivered UK Spring 2016 MICE Project Board, 27th October 2015

4 RF Distribution Network
Must Support 2MW in 6” line and 1MW in 4” line with full reflect 4” lines rated to 1.12MW at 1 atmosphere in dry air Therefore will be pressurised by SF6 1.5 bar gives safety factor of 2 in power handling (c.f. 1MW and full reflect) Will be treated as pressure vessels Some of the 6” and 4” line from the NSF MRI procurement will be modified All components/devices will be drawn from the NSF procured stock Must deliver power to two cavities installed in line AND one offline test positions Estimated <10 % loss in transmission line Power delivered to each cavity 1.62 MW, Anticipated gradient in each cavity 10.3 MV/m MICE Project Board, 27th October 2015

5 RF distribution network
RF network design has moved to detailed engineering Off-centre mounting of hybrid takes up phase shift- ensures equal length lines Orientation of load aligns with the 6” distribution line, shares mountings Minimised length of 4” line- minimises losses MICE Project Board, 27th October 2015

6 MICE Project Board, 27th October 2015
RF network Hanger design now complete and fabricated Includes both online and offline hangers Support will be from present ‘shield wall’ and yoke Components now at Daresbury Ready for test assembly RF components identified and ready for measurement MICE Project Board, 27th October 2015

7 MICE Project Board, 27th October 2015
RF Drive System First Amplifier Chain Has delivered required 2MW at Daresbury test stand Installed and commissioned at RAL autumn delivered 500kW Output (triode) stage remains installed at RAL Modulators and preamplifiers returned to Daresbury Mechanical changes complete to output stage modulator Will permit use of upgraded crowbar Preamplifier recommissioned at Daresbury Includes modification to the input circuit- improves reliability Delivered 220kW- ready to test triode no. 2 Second amplifier chain Output stage mechanically complete- awaits electrical effort Tests expected by end 2015 Using upgraded modulator for first chain Second tetrode amplifier mechanically complete- Tests planned March 2016 MICE Project Board, 27th October 2015

8 MICE Project Board, 27th October 2015
RF Drive System Modulators: System 1 Triode modulator presently receiving upgraded crowbar Ready for tests Dec ‘15 Tetrode modulator crowbar upgrade by April ‘16 Modulators and preamplifiers returned to RAL July ’16 After test of control rack 2- next slide Will be used to drive amplifier system to test cavities in hall Modulators: System 2 Pre-amp modulators ready Aug ‘16 Commission with pre-amplifier No. 2 Output stage modulators ready Dec ‘16 Commission RF system No. 2- Jan ‘17 Feb ’17 system no.2 ships to RAL for installation Resources Development of these modulators requires significant Electrical Engineering Effort Support from ISIS EE will help- tetrode grid modulators to MICE duty requirements MICE Project Board, 27th October 2015

9 MICE Project Board, 27th October 2015
RF Drive System Controls system Development of controls racks is underway by Daresbury Electrical Engineering Based on requirements defined by RF team Will review controls definitions in two weeks time 1st Demonstration of remote control- Control rack No. 1 tested Daresbury May ’16 Using Modulator System 1 and Amplifier chain No. 2 2nd controls rack commissioned Test at Daresbury July ‘16- Prior to transport of 1st modulator system to RAL Integration of RF control subsystem to MICE controls Primary RF controls interfaces will be by EPICS Facilitates integration to MICE controls Interface points of LLRF subsystem to RF controls to be defined in detail See later slides New resources at Imperial being brought to support this integration MICE Project Board, 27th October 2015

10 MICE Project Board, 27th October 2015
LLRF System Effort has been invested to address resource issue reported at last MPB FPGA LLRF programming expertise departed from DL spring ‘15 Sought (and received) support from ISIS RF team- ISIS have prioritised MICE LLRF development Possible if MICE system is similar to ISIS requirements Bob ~ 100% effort MICE are very appreciative of ISIS support 201 MHz LLRF system operating in RF lab at RAL Based on Daresbury Digital LLRF system planned for MICE Plans in place for LLRF development First system (control one cavity) ready by April 2016 Second system (controls two cavities) ready by March 2017 Two modes: Open Loop ‘tune up’ mode- with external source under manual control Closed loop single frequency operation once cavity on tune Daresbury have appointed new RF FPGA specialist MICE Project Board, 27th October 2015

11 MICE Project Board, 27th October 2015
LLRF System Housekeeping system for ‘slow’ control and monitoring of the RF system New Daresbury appointment has expertise in NI systems Similar to NI system in use at MTA- in particular tuner control will carry over Hardware specified and priced- awaiting purchase Will monitor: fwd and refl power, cavity pick up signal spark events, vacuum pressure Coolant flow and temperature Tuner pressure Control cavity tuners Fixed hold and closed loop modes Selected during open loop set up of cavity Decisions on shut down in event of sparks Monitor relative phase of cavities Provide ‘trigger’ signal to DAQ that system is nominal (i.e. full and correct phase delay) MICE Project Board, 27th October 2015

12 MICE Project Board, 27th October 2015
LLRF System Plan to operate at MHz closed loop 9/11 of LLRF clock at MHz Prototype operating in ISIS injector group RF lab- adjusting phase to compensate for trombones MICE Project Board, 27th October 2015

13 MICE Project Board, 27th October 2015
LLRF System Test panel data operating at MHz closed loop Deliberately reduced ‘speed’ in the feedback system Shows clearly the ‘tune’ at the start of the pulse MICE Project Board, 27th October 2015

14 MICE Project Board, 27th October 2015
RF Module progress Testing in a comparable magnetic field at the MTA at Fermilab Verified the surface treatment for the RF power couplers Reached 13.7 MV/m with zero sparking Order for vacuum vessels placed Completion Jan. 8, 2016 Component parts: Cavity bodies complete Tuner arms complete Actuators complete 30th November RF power couplers complete 30th October Assembly of first unit to begin in early Jan Cavity/tuner arm preparations beginning now Clean room prep beginning now. MICE Project Board, 27th October 2015

15 Update: Muon – RF Timing
Fourier window= pulse duration – Phase walk is ~ 38 ps Subsampling of RF signal desired Suppress data volumes Esp. at DAQ system Exploits narrow cavity linewidth Restore signal with Fourier Domain reconstruction Shows systematic phase drift Phase drift associated with inadequate FD resolutions Improved by artificial extension of sample duration Phase drift inversely proportional to FT window duration Implies require data length ~4 x greater than pulse duration Fourier window= 2 x pulse duration – Phase walk is ~ 18 ps MICE Project Board, 27th October 2015

16 Update: Muon –RF Timing
WALK (ps) vs FT window Sample Rate (MSa/s) Sig Duration x2 x4 4 12000 600 280 5 900 450 225 8 500 250 125 10 375 180 90 20 100 47.5 24.5 25 45 40 37.5 18.5 9 50 62.5 31.5 16.5 60 30 200 140 73 35.5 Subsampling of RF signal desired Suppress data volumes Esp. at DAQ system Exploits narrow cavity linewidth Restore signal with Fourier Domain reconstruction Shows systematic phase drift Phase drift associated with inadequate FD resolutions Improved by artificial extension of sample duration Phase drift inversely proportional to FT window duration Implies require data length ~4 x greater than pulse duration MICE Project Board, 27th October 2015

17 Installation and Commissioning Programme: Cavity No 1
May 2016: Module delivered assembled, LLRF tested from LBNL Re-test tuning Exercise Tuners Acceptance Criteria Prepare Cavity for operation June-Sept ‘16 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 X-ray shield (est ~80 microSv/hr at 3m) Evacuation, Install & tune overhead RF lines, Retest of cavity tune after evacuation, Amplifier No 1 installed Oct ’16 Offline High Power RF tests Oct-Dec ‘16 MICE Project Board, 27th October 2015

18 Installation and Commissioning Programme: Cavity No 2
Pre test prep in parallel with Cavity 1 Make transition to test of cavity No 2 rapid Will continue to use amplifier No 1: After end of tests of cavity No 1 Installation and high power tests Expected Jan-April 2017 Installation and Commissioning Programme: Cooling Channel Cavity 1 install online Jan ‘17, Cavity 2 Install online May ’17 RF Amplifier No 2 installed Nov ‘16 through May ‘17 Pump down and High Power Tests – No B field June ’17-Mid July ‘17 High Power Test with B-fields Sept ‘17 MICE Project Board, 27th October 2015

19 MICE Project Board, 27th October 2015
Resources Resources required recently revised In light of a review held in Sept. Chair: M Palmer Indicates the need for enhanced RF project resources Considered both the RF and EE expertise Discussed by Colin Whyte, Alan Grant earlier STFC effort indicated requiring 2x increase immediately Presently Tim Stanley full time support by KR, SA at fractions Addition of effort of Bob Anderson and Increased effort of Saad Alsari Involve Ajit Kurup on controls New appointees Florian and DL will contribute Looking forward to commissioning cavities /amplifiers reveals conflicts Requirement RF experts across two sites and with requirements to test cavities out-of-hours requires particular uplift in RF effort through ‘16 and ‘17 US RF expertise requested in this commissioning activity Reflected in resources discussed by Peter Garbincius Approx. 1.5 US Man Years allocated for cavity tests- Possibility of increasing by about 0.6 FTE MICE Project Board, 27th October 2015

20 MICE Project Board, 27th October 2015
Summary Detail design and fabrication of distribution network Components now at Daresbury for hangers Ready for trial assembly Power Amplifier tests resumed Input structure of first tetrode improved 2nd Triode nearing completion LLRF resource issues: resolution in sight Prototype system operational Detailed plan for system to be built up RF Modules Derisking largely complete Component fabrication underway- assembly commences Jan ‘16 Sub Sampling of the RF for Muon phase determination Required accuracy is reliably reproduced on synthesised signals Using enhanced scheme for Fourier Domain reconstruction Control/Automation requirements drafted & reviewed Allows hardware to be built up Additional programming expertise being brought on board Proposal for full system tests in mid-late 2016 Will debug system ahead of operation in summer 2017 MICE Project Board, 27th October 2015

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