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AMS-02 TRD Status ReportStefan Schael

RWTH AachenTIM Meeting, CERN, June 2001

TRD meeting: Wednesday 16:15 in room 13-3-005 !!!

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TRD Mechanics

Octagon Production:• 8 panels produced at FVT Aachen• machined at IPT, RWTH Aachen• glued together at Physics AC-I

Bulkhead Production:• 6 panels produced at FVT Aachen• machined at IPT, RWTH Aachen• integrated at Physics AC-I

Production Status:• EM produced• QM in production• FM expected for Spetember 2001

Production Status:• EM in production• QM expected for August 2001• FM expected for September 2001

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TRD assembly

• Mechanical accuracy (100 m) of the octagon structure will be verified with a 3D coordinate measuring machine in Aachen.

• TRD assembly in a clean room with temperature (+/- 1°) and humidity control• Test of the full TRD in Aachen on a cosmic stand.

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TRD Module Production I

Production scheme:Straws and stringers are glued together at FVT, AachenWire feed through, wire crimping, endpiece assembly and all tests at Physics AC-I

Production status:• Clean room at FVT ready for mass production• the first 2 m long chamber has been produced EM.• feed through of the wires was no problem• wire tension has been measured and is well within the specifications

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Wire tension measurements

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Gas Gain Measurements

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Long Term Teststand

• Study the long term behaviorof straw modules

• 8 1.8 m long straw modules,i.e. one gas group

• operated with Xe/CO2 (80%/20%) in a vacuum vessel

• use a mass spectrometer to measure the leak rate

• use a recirculating gas system(P. Fischer, MIT) as for the TRD on the ISS

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TRD Module Production: Next Steps

• produce 4 modules (1.4 m long) for space qualificationi.e. vibration test, acoustic test, thermo vacuum test, EMI test

• produce 8 modules (1.8 m long) i.e. 1 gas group for the long term test• we expect to start the mass production in September 2001.

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• The fleece material (LRP 375 BK)has been produced and cut to therequired width by Freudenberg

• We have started to cut the radiatorto the appropriated length

• Cleaning of the radiator has alsostarted at the Institute for Organic Chemistry of the RWTH Aachen.

• We expect to have all radiatormaterial ready for TRD assemblyby October 2001

TRD radiator

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TRD Upper TOF Combined Thermal Control

• TOF Power TRD Power 20 Watt

• TOF & TRD connected to the sameM-Structure

• Contract has been placed with OHB & CGS

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Radiative link between the PCB‘s (UFE boards) and the radiator:

Next step: TOF & TRD in the same MLI volume

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First results from the TRD thermal model:

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TRD temperature monitoring

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TRD Electronics I

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• 60 qualification boards build and tested

- no failure

- typ. leakage current: < 0.3 nA at 2000V

(at room temperature, in air atmosphere, 1 bar )• Thermal cycles performed on 10 qualification boards (-30°C, +60°C)

- no change in behaviour

• Vibration tests executed on 10 qualification boards - no change in behaviour

• Production of 350 flight boards started

Status of the UTE Board

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Status of the UFE Board

• Prototype of UFE Board build and tested

- full functionality at the readout speed of 1 channel/1 µs

- measured noise ~ 5500 electrons

• Next steps

- design, production of qualification boards,

with final el. circuit and final board shape

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TRD Crate

MIT/Aachen I

=> CAEN CSIST

EM QM1 QM2 FM SM Total

crate - 1 1 2 - 3

UPD - 1 1 2 2 5

DC/DC 100

LV 6 6 18 36 6

HV 2 2 12 24 4

UBP 1 1 1 2 2 5

UPSFE 2 2 6 12 2 20

UDR 2 2 6 12 2 20

JINU - 1 1 2 1 4

UHVG 1 1 6 12 2 20

UPC 1 2 - 4 2 AC III

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TRD Test Beam Results I

• 20 layer TRD detector in the test beam at CERN in 2000• we have recorded 3 million events providing signals for protons, electrons,

muons and pions at energies from 5-250 GeV• Muon events have been used for an intercalibration of the individual straws

to a relative accuracy of 2%.

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TRD Test Beam Results II

The TRD fulfills the specification of:proton rejection < 1% at an electron efficiency of 90% up to 260 GeV

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TRD Test Beam Results III

• Likelihood method much more effective for pion rejection thancluster counting

• Result probably still dominated by pion contamination => it is still an upper limit !!!

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Summary

since Houston we have made a lot of progress on:

• TRD straw module productionand test stands

• TRD electronic, thanks to M. Capell and R. Battiston

• TRD thermal control

• TRD MC simulation

• the TRD is well within schedule

• TRD mass budget (378 kg) and power budget (20 Watt) has not changed.

• test beam results show that the performance to the TRD is well withinspecifications