1. Ivan Vitev & E906 Muon Identifier Status Patrick McGaughey and the muon radiography team E866 Meeting at FNAL June 20-21, 2007 Large Muon Tracker at LANSCE

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

3. Patrick L. McGaughey 3 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. Option for more modern electronics with LVDS output (<50$/chan) Well tested design with 1000’s of operational tubes. Works with a variety of gas mixtures @ ~ +2300V  End view of a 16 tube module

4. Patrick L. McGaughey 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

5. Patrick L. McGaughey 5 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

6. Patrick L. McGaughey 6 Upgrade Path for Readout Electronics? Input AD8015 AD8132 ADCMP604 LVDS Output Modern electronics with LVDS output 16 chan / card, +5V only, 6 W 4000 channels already built and working with FPGA based TDCs Low noise, low crosstalk, very stable ~$50 / channel

7. Patrick L. McGaughey 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

8. Patrick L. McGaughey 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.

9. Patrick L. McGaughey 9 Module and Channel Counts Target 2 nd magnet 1 st magnet p ++ -- sweep momentum analysis 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 ~24 modules required, have 56 available with electronics Could increase size of station 4, if useful

10. Patrick L. McGaughey 10 Issues What will the TDC system be? Commercial Fastbus TDC with ECL inputs or Custom FPGA based TDC with LVDS inputs Is the MuID hit info useful for a high level trigger? Choice of output cabling depends on logic type and path length LVDS limited to about 15 m Gas selection? Non flammable or flammable? Fast or slow drift? Compatibility with other tracking stations?