Station-4 MuID System: Status

Ming X. LiuLos Alamos National Lab

1/7/09 1E906 Collaboration Meeting

2

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

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

1/7/09 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

1/7/09 E906 Collaboration Meeting

6

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

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

1/7/09 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.

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