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Report on tests ongoing in Perugia

Report on tests ongoing in Perugia. Mauro Piccini, Roberto Piandani INFN – Perugia and Perugia University. Outline. Test with PM in Neon Measurement of time resolution of PM with the TELL1+Pisa TDC board set-up ( CEDAR samples form Phil)

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Report on tests ongoing in Perugia

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  1. Report on testsongoing in Perugia Mauro Piccini, Roberto Piandani INFN – Perugia and Perugia University

  2. Outline • Test with PM in Neon • Measurementoftimeresolutionof PM with the TELL1+Pisa TDC board set-up ( CEDAR samplesform Phil) • Planetoglue the quartz windows in Perugia

  3. PMs on Neon: first step First attemptto separate PM (in Neon) from the divider (in air) using a feedthroughtobeglued on the Aluminium (Steel) support. Once HV test wereperformed in an air-tight box filledwith Neon wesawdischargesalready at 600 V (workingpoint at 900 V) Question:dischargesbewteen the PM pins and the external flange (connectedto the ground) or between the pinsthemself?

  4. The newfeedthrough A newfeedthroughwasdesigned and producedtoelectrically separate the PM from the external flange

  5. Resultsof the new test Fake PM usedfor the test, in ordertopreventanydamage Dischargeshavebeenseenbetween 600 and 650 V, slightlydepending on the timetakentoflux the Neon and on the output pressureof the Neon bottle (between 1.1 and 1.8 bar). Once the dischargestarts, torecoverwehavetostrongly reduce the HV (below 100 V) As a first step in the discharge, weseeanincreaseof ~20% of the currentgoingthrough the divider, thenwithfew more tensofVolts the dischargeis complete Stoppingtoflux the Neon, the Neon itself start tobepollutedby the air and the threshouldfor the dischargedecreases down to 480 V Confirmed the behaviourfoundbyPiet in litterature

  6. Remind on the divider

  7. PM test Meanwhile, after the completationof the test of the first 500 RICH PMs (2010 sample), we test 50 CEDAR PMssuppliedby Phil Results in agreementswith the testsperformed on the RICH PMs

  8. RICH PMs Nowour TELL1 ishere at CERN tobereplacedby a newone (hardware problem in the connectionsof a PP FPGA) Hopingtosoonhave the newone in labto test the remaining 700 PMsof the 2010 sample

  9. Planestoglue the quartz windows WeobtainfromINFN-Perugia the CleanRoom (ISO 4, temperature and humiditycontrolled) as the placewheretoperformsuchoperation http://www.pg.infn.it/sez/laboratori/camera_pulita/clean-roomENG.htm We are already in contactwith a supplier company tobuy the quartz windows The flange willbemanufacted in Firenze The choice between the vacuum vessel option and the “CO2” one, doesn’t affect the mechanical characteristic of this flange, in fact the same method exploited in 2007 and in 2009 can be re-applied • Ongoing work in Perugia: • Definition of a tool to uniformly distribute a fixed amount of glue in the • surface where the window and the flange are in contact • Design of a system to measure the tightness of each window after the • gluing

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