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Station-4 MuID System: Status

Station-4 MuID System: Status. Ming X. Liu Los Alamos National Lab. E906 Spectrometer: Bend plane view. Muon ID layers start here, 2X and 2Y ~250*250cm. Our Current Plan. Use drift tubes built by LANL Muon Radiography Team Already built and tested @ LANL Available for E906

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Station-4 MuID System: Status

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  1. Station-4 MuID System: Status Ming X. Liu Los Alamos National Lab E906 Collaboration Meeting

  2. E906 Spectrometer: Bend plane view Muon ID layers start here, 2X and 2Y ~250*250cm E906 Collaboration Meeting

  3. Our Current Plan • Use drift tubes built by LANL Muon Radiography Team • Already built and tested @ LANL • Available for E906 • Installation and commissioning @Fermilab this year • Installation, optical survey and cabling • Interface to DAQ • CAMAC-based TDC “LeCroy 3377”, E906 common items (12) • Gas system • Ar + Ethane through an alcohol bubbler (4) • Flow rate: ~ 1SCFH • ~25CF per plane • HV and LV • ~+2500V, total 4 channels • +5/-5.2V, ~1A per module/channel, total 24 channels • Calibration and monitoring • I, V, T … E906 Collaboration Meeting

  4. Drift Tube Module from Muon Radiography A module consists of 2 staggered rows of 8 tubes, 16 tubes total ~ 4” X 16” X 12’ Each tube is 2” X 12’ with 20 sense wire at +HV Each module is readout with a Nanometrics N-277 amp/disc card using +-5V power Close-up of one 16 channel module E906 Collaboration Meeting

  5. Station 4 Muon Identifier Design • 2 X and 2 Y layers, coverage ≥ 250 * 250 cm • Aluminum drift tubes for good position resolution  track matching to Station 3 drift chambers • Each plane constructed of 2 staggered rows of 2” diameter tubes for excellent efficiency and reasonable channel count • Nanometrics amplifier / discriminator electronics with ECL output. • Well tested design with 1000’s of operational tubes. • Works with a variety of gas mixtures @ ~ +2300V  End view of a 16 tube module E906 Collaboration Meeting

  6. Existing N277 Nanometrics Amplifier / Disc. Differential ECL outputs 16 Channels / card +-5V power, 6 watts Poor crosstalk but otherwise good performance 56 drift tube modules are instrumented with N277 cards Input E906 Collaboration Meeting

  7. μRad Large Muon Tracker at LANSCE 6 X and 6 Y layers 48 Modules visible Arranged for vertical cosmic ray muons Disassembled and in storage for E906 Will need new support structure for E906 E906 Collaboration Meeting

  8. Measured Performance with Cosmic Rays • Gas : Ar - isobutane 70:30 • HV = +2300V • ~300 micron resolution averaged over entire array • ~99.5% efficiency, consistent with tube wall thickness • Maximum drift time ~ 1600 ns with this slow gas • Nanometrics amplifier / discriminator electronics, threshold set to 1 Volt. E906 Collaboration Meeting

  9. SummaryModule and Channel Counts 4 planes required for E906: 2 X and 2 Y, ~250 x 250 cm area 6 modules per plane provides 244 x 366 cm area 384 total channels of electronics, 4 channels of +HV and 24 for +/-LV 24 modules required, have 56 available with electronics Could increase size of station 4, if useful momentum analysis Target + p 1st magnet sweep 2nd magnet - E906 Collaboration Meeting

  10. Issues and To Do List • Mechanical supporting structure for vertical installation • Design and material: ~10k • when and where: Fermilab shop this summer? • Before shipping to Fermilab • Electrical test of all modules, ~1week early this year • U-Haul truck, this summer? • @Fermilab • Mechanical installation, cabling etc, need help on manpower • Optical survey, ~1mm precision • Interface to DAQ, signal delay etc. Needs help from DAQ group • Gas system, HV and LV PS.. Fermilab pool? • Calibration, monitoring and offline code • Slow control system to monitor I/V/T … E906 Collaboration Meeting

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