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Status Report: SciFi for MICE

Status Report: SciFi for MICE. Edward McKigney Imperial College London. Overview. Data Taking Cycle for MICE RF Background estimate for MICE MuScat Detectors Baseline MICE Tracking Detectors. One Muon/Pulse Governed by machine and RF rep rate (max 50 Hz)

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Status Report: SciFi for MICE

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  1. Status Report: SciFi for MICE Edward McKigney Imperial College London

  2. Overview • Data Taking Cycle for MICE • RF Background estimate for MICE • MuScat Detectors • Baseline MICE Tracking Detectors

  3. One Muon/Pulse Governed by machine and RF rep rate (max 50 Hz) Effectively about 15 Hz to eliminate occupancy problems 106 events in 18 hours May be stability issues Multiple Muons/Pulse Same as One Muon/pulse + RF flattop, detector response and DAQ buffering Should be able to gain at least a factor of 100 over One Muon/Pulse Data Taking Cycle

  4. X-ray Background

  5. The fiber data used a single 1 mm diameter round fiber 10 cm long MICE baseline is 0.5 mm diameter by 30 cm Rate is like diameter2 Assume 1000 fibers per layer and a tolerance of 1 extra hit per layer in a 50 ns window. Tolerable noise rate is about 20 kHz per fiber Can tolerate roughly 4 MV/m, from our measurements Background Estimate for MICE

  6. The MuScat Experiment

  7. Scintillating Fiber Tracker • Three planes of 1 mm diameter fibers (x and y) • Position resolution of about 200 microns • Efficiency greater than 95%

  8. MuScat Test Beam • Data taken using the HEP test beam at RAL • mixed pion and muon beam at 260 MeV/c • Measured efficiency for one doublet layer was 93.6  0.5(stat.)% • This was the first plane made, we expect improvement

  9. Photo-electron distribution

  10. 30 cm radius active area 0.4% X0 thickness High Efficiency Position resolution of better than 200 m Capability to handle x-ray background rates Capability to survive RF induced radiation damage MICE Detector Parameters

  11. Recent Developments • C. Perry from Oxford has investigated building a simple front end to read out PMTs or HPDs for use with MICE • Based on a simple comparator, time above threshold pulse height measurement and FPGA for buffering; USB for readout • Dominant cost is for PMTs

  12. Conclusions • A burst type DAQ seems the best solution for reading out the detectors • First indication is that backgrounds can be controlled by keeping the accelerating gradient relatively low, but much more work is needed • More work has gone into studying readout electronics and options, but efficiency and cost point to use of VLPCs

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