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Cross section of a double-stack MRPC

Cross section of a double-stack MRPC. Clean room for MRPC strip production. Quality assurance tests:. Before strip assembly : wash/rinse/dry glass plates measure red-glass resistivity in 5 points check honeycomb plates and PCB planarity After strip assembly :

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Cross section of a double-stack MRPC

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  1. Cross section of a double-stack MRPC

  2. Clean room for MRPC strip production

  3. Quality assurance tests: Before strip assembly : • wash/rinse/dry glass plates • measure red-glass resistivity in 5 points • check honeycomb plates and PCB planarity After strip assembly : • measure global resistance of resistive glasses • measure gap size in 5 points • HV test in air (3 kV) • check soldering on r/o channels with pulser test • HV test in gas and measure efficiency and time resolution with cosmic-ray telescope (for a random sample ~3%) Fill the MRPC database (traveler ---> DCDB)

  4. Glass-plates washing room ultrasound tank (wash) cold water tanks (rinse) oven (dry) water filtering system

  5. Washing the glass plates Ivan Kiselevich and Alexandre Zinine ITEP (Moscow) at Bologna INFN Section

  6. MΩ/□ position (cm) Measure the red-glass resistivity in 5 points LabVIEW DAQ system

  7. Planarity check all the honeycomb plates and PCBs are checked on a marble high-precision table largest accepted non-planarity ∆ = 0.2 mm

  8. MRPC construction steps • Preparation of the components: glueing honeycomb plates on cathode PCBs, inserting plastic screws in bottom PCB, cleaning the red glasses, ..............

  9. Glueing the red glass plates on the PCBs by using the marble precision table Hyang-Nam Kim and Won-Woong Jung Kangnung National University Republic of Korea at Bologna INFN Section

  10. Stack assembly procedure with “Penelope” (automatic fishing-line positioning machine)

  11. External-to-central PCB pins and connector solderings (1664/strip)

  12. Gap width - strip b41 (μm) MRPC assembly monitoring Microscope + CCD camera + LabVIEW software to check gap width uniformity along a strip (250 μm ± 10 μm)

  13. current (μA) HV (kV) MRPC assembly monitoring HV test in air at ±3 kV universal multichannel power supply CAEN SY3527 For 95% of strips, current is below 100 nA

  14. MRPC assembly monitoring Pulser test to check r/o channels soldering pulser trace

  15. Trigger with coincidence of at least 4 FAST-OR signals from FEE Time resolution computed from 5 time measurements σ ij2 = σi2 + σj2 σjk2 = σj2 + σk2 σkw2 = σk2 + σw2 σwz2 = σw2 + σz2 σzi2 = σz2 + σi2 Ti – Tj Tj – Tk Tk – Tw Tw – Tz Tz – Ti Coincidence unit START TDC σi = √(σij2 + σzi2 + σkw2 – σjk2 – σwz2)/2 MRPC assembly monitoring Test with cosmic-ray telescope Cosmic-ray telescope in Bologna laboratory

  16. The first 18 MRPCs from mass production tested at PS in July/October 2004 102 HV scans in 4 positions along the strips

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