RF Review CM37 Andrew Moss. Amplifier results at Daresbury 2MW at 35kV, good efficiency and gain.

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Presentation transcript:

RF Review CM37 Andrew Moss

Amplifier results at Daresbury 2MW at 35kV, good efficiency and gain

Amplifier Installation plan MICE Hall Driver stage and PSU racksEnd-stage, ground floor

Amplifier installation actual System striped down and moved to RAL Installation of system progress at pace 4616 tetrode system awaiting electrical connect 116 triode fitted to endstage amplifier

Procurement of RF Coax and equipment MEGA, in the USA, have fulfilled full order of parts for entire MICE RF system. Importation, under MoU, via Univeristy of Mississippi, achieved late September. Many thanks to Don Summers, and UMISS, for supply of co-ax and other components of RF system

6 tons of RF equipment arrive from University of Mississippi

Requirements for Muon-RF Phase Timing ToF detectors provide 50ps resolution time stamp for the particle Systematic delays well understood Trackers define muon orbital trajectory Predict delay to first cavity- this is the time we want to ‘perform’ our RF phase measurement In order to not compromise the current resolution Ideally want accuracy to be 50ps/3, ~15ps, ~1 o. May be relaxed subject to advice from analysis group Cavity linewidth is ~50kHz in 201MHz centre, That is 2.5 parts in Max phase shift in 1 cycle is ~0.1 o. Can therefore project about 10 cycles from measurement point Adding only 1 o to the error Requires accurate measurement as baseline for projection May be eased by the LLRF feedback loop gain bandwidth

Phase detection schemes RF zero crossing easiest to define and provides best trigger edge Detector clock should be synchronised with ToF Use external clock (from LLRF) and LLRF Feed-Forward complete trigger to zero all timebases No interesting data till LLRF enters closed loop for phase Confirms peak gradient achieved Could use existing Caen TDC’s and LeCroy Discriminators used for ToF Known hardware and programming interface Minimises electrical length uncertainty and thermal variability Limited to 25ps resolution Requires unproven resolution enhancement Either enhanced digital Vernier or Analogue (requires knowledge of amplitude) interpolator Requires discriminators tested in 201MHz environment Use alternative, faster TDC Agilent semi analogue device Is unproven, new programming and hardware interface Has different hardware limitations to understand

Phase detection plan Four routes have been defined to achieve accurate phase of the RF signal at arbitrary time All will be investigated in parallel for now Preferred route is additional interpolation on Caen TDC’s/LeCroy Discriminators Needs to be proven experimentally Supported by one of two digitisation approaches Interpolation approaches are being investigated at this time Interaction of the LLRF will bring benefits Hopefully analysis will ease the accuracy requirement The long term stability and batch variability of the long signal cables needs to be understood

RF Summary MICE RF Amplifier system has now operated at 2MW with good operating parameters Amplifier is now being installed in the MICE hall to meet the TIARA milestone of RF power in the experiment hall, December 2013 UMiss 6 tons of RF equipment has been delivered to RAL Muon RF phase detection – investigations into Tof system, phase detection and possible solutions, cavity simulator will be built to aid investigations MTA test’s progressing towards test in early 2014, cavity is being assembled into single cavity test stand complete with tuners and new couplers Original cavity from MTA will go into storage – could be used for testing in the UK if it could be done cheaply