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Our Current Plan Use drift tubes built by LANL Muon Radiography Team – Already built and LANL – Available for E906 Installation and 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 … 1/7/093E906 Collaboration Meeting
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Station-4 MuID System: Status
Ming X. LiuLos Alamos National Lab
1/7/09 1E906 Collaboration Meeting
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E906 Spectrometer: Bend plane view
Muon ID layers start here, 2X and 2Y~250*250cm
1/7/09 E906 Collaboration Meeting
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 …
1/7/09 3E906 Collaboration Meeting
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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
1/7/09 E906 Collaboration Meeting
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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
1/7/09 E906 Collaboration Meeting
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Existing N277 Nanometrics Amplifier / Disc.
Differential ECL outputs16 Channels / card+-5V power, 6 wattsPoor crosstalk but
otherwise good performance
56 drift tube modules are instrumented with N277 cards
Input
1/7/09 E906 Collaboration Meeting
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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
1/7/09 E906 Collaboration Meeting
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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.
1/7/09 E906 Collaboration Meeting
9
SummaryModule and Channel Counts
Target
2nd magnet
1st magnetp
+
-sweep
momentumanalysis
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 electronicsCould increase size of station 4, if useful
1/7/09 E906 Collaboration Meeting
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 …
1/7/09 10E906 Collaboration Meeting