ivan vitev & e906 muon identifier status patrick mcgaughey and the muon radiography team e866...

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

Patrick L. McGaughey

2

E906 Spectrometer: Bend plane view

Muon ID layers start here, 2X and 2Y~250*250cm


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

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

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

Upgrade Path for Readout Electronics?

Input AD8015AD8132

ADCMP604

LVDSOutput

Modern electronics with LVDS output16 chan / card, +5V only, 6 W4000 channels already built and working with FPGA based TDCsLow noise, low crosstalk, very stable ~$50 / channel


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

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

Module 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

~24 modules required, have 56 available with electronicsCould increase size of station 4, if useful


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Issues

What will the TDC system be?Commercial Fastbus TDC with ECL inputs orCustom 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 lengthLVDS limited to about 15 m

Gas selection?Non flammable or flammable?Fast or slow drift?Compatibility with other tracking stations?

ivan vitev & e906 muon identifier status patrick mcgaughey and the muon radiography team e866...

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