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Tooling / Test Stations for MWPC

Tooling / Test Stations for MWPC. (Meeting LNF, Roma1/Pz 8-4-2002). Production rate : 408 chambers (F e + LNF ) : 192 R4 M 1 144 R3 M1,M2,M3 48 R2 M4,M5 24 R1 M4,M5 Production rate/lab : 2 –3 chambers / week. OPERATIONS INSIDE CLEAN ROOM

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Tooling / Test Stations for MWPC

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  1. Tooling / Test Stations for MWPC (Meeting LNF, Roma1/Pz 8-4-2002) Production rate : 408 chambers (Fe + LNF): 192 R4 M1 144 R3 M1,M2,M3 48R2 M4,M5 24 R1 M4,M5 Production rate/lab :2–3 chambers / week G. Martellotti CERN 22/04/2002

  2. OPERATIONS INSIDE CLEAN ROOM (Responsibilityof production centers) 1- Wiring ~ 2 hours/ 2 gap 2- Glueing / soldering. - Control wire pitch 3 - cut in two mono-gap layers 4 - Wire tension test <1 hours/gap (< 1 min/wire, 16-32 wires in parallel) 5 - HV test in air on single gap with open chamber 6 - assembling 4 gap chamber G. Martellotti CERN 22/04/2002

  3. OPERATIONS OUTSIDE CLEAN ROOM (Tools developed by Roma1) 1 - gas leakage test. < 1 hour / chamber Give over-pressure, close gas pipe, measurepressure decrease with time. Record pressure and temperature. 2 - chamber conditioning (Gas mixture and HV)~24 hours (parallel operation for several chambers is needed) 3 - Gain uniformity measurement< 1 hour / chamber with radioactive source Record source position, total current 4 - cosmic rays test2 -4 days/chamber measure efficiency plateau, time resolution (parallel operation for ≥ 4 chambers) G. Martellotti CERN 22/04/2002

  4. 1) - gas leakage test 2) - chamber conditioning 1) can be done in air/argon in a short time 2) require a long time and the right gas mixture Tests outside the clean roomneed several working areas (problems of space, number of gas subsystems). Try to reduce working areas - perform 1) and 2) on the same station (with final gas mixture?) Digital manometers and readout cards are being ordered. Three flow-meters are available… G. Martellotti CERN 22/04/2002

  5. Tentative layout for test stations G. Martellotti CERN 22/04/2002

  6. 3 - Gain measurement with radioactive source • - We assume that a spot~ 5cm diameter on the farthestgap is ok to • monitor gainuniformity • a minimum current of >20-30 nA should be measured • (assumimg a maximum acceptable dark current of order of 10 nA) • the most suitable source seems Ce137, 20-30 mCurie intensity. • According to Cern safety rules, 4-5 cm Pb screening is needed. • Best solution: screen with a layer of 4 cm Pb below the chamber. • This implies about 500Kg Pb and a quite heavytable structure. • (secondoption: eliminate the lead plate and protect operators • fromirradiation byclosing the access to the table all around). • To be recorded : source position, total current • Current readout : digital nA 16 channels home made (G. Corradi) G. Martellotti CERN 22/04/2002

  7. G. Martellotti CERN 22/04/2002

  8. G. Martellotti CERN 22/04/2002

  9. G. Martellotti CERN 22/04/2002

  10. 4 - cosmic rays test • Measure efficiency plateau,time resolution • - Trigger : two layers of scintillator counters • Muon tracking with an hodoscope of 6 same-size chambers • (top and bottomchamber used as reference) • Readout through DIALOG. Measure the efficiency of all • front-end channels running with two DIALOG configurations. • ( 2 runs of > 24 hours) (test single gap switching off HV ?) • A maximum of 96x6 channels must be readout. • Multiplexing by a factor 6 with a delay of ~ 200ns/chamber • (home made V. Bocci) allows to use only one TDC (128 ch). • # Estimated cost of ReadOut :-with multiplexing 10-20 E / ch • - with more TDC modules55 E / ch G. Martellotti CERN 22/04/2002

  11. 4 movable chambers G. Martellotti CERN 22/04/2002

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