Gas systems project

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155/R-047 (CERN)

155/R-047

CERN

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Beatrice Mandelli (CERN), Frederic Merlet (CERN)
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GAS M&O meeting 04 November 2019

Present: Beatrice, Roberto, Michal, Fred, Patrick, Kacper, Andrea, LPh, Mara, Gianluca, Sabino, Federico, Fabio

Indico: https://indico.cern.ch/event/860752/

 

ALICE #2048

  • MTR

Reminder:

    • Dummy chamber: Arturo will install the pipes in January, gas team will do weld
    • exhaust pressure regulation does not work
    • mixer pressure regulation does not work: Zimmerli not installed
  • TPC

Reminder:

    • LPh to prepare a summary on how the system is now
  • TRD

Reminder

    • Purifier: to review if keep the safety valve or the rupture disk
    • Purifier: safety valve at the input where we have Ar or Ar/H2 at high pressure —> LPh to check with safety

 

ATLAS #2045

  • CSC

Reminder:

    • After the power-cut there was not communication with PLC: damage of differential circuit breaker —> to repair
  • MDT
    • Rack 68: motherboard changed: now ch 17 is ok
    • In general: several problems with pressure sensor in MDT. Patrick said to add a resistance in the channel
  • RPC
    • Pipes under cleaning

 

CMS #2038

  • RPC
    • OFF
    • Anton asked to prepare all dummy chambers
    • Rack 85: problem of pressure sensors in error: problem in the cable (UX-US) —> Anton changed it
    • Commissioning of the software on-going
    • Filter for pump to do
    • Rack 85: found paraffin oil on the ELMB board
    • Wok on flowcell done by Michal (elog 14 in flowcell elog)
  • DT

Reminder:

    • Test for power cut and re-start for the exhaust line —> to do other tests
  • CSC

Reminder:

    • Warning to set-up —> Beatrice/Michal/Roberto
  • GEM
    • Connection of detectors this week

Reminder:

    • To modify the réseaux socket for the GEMPLC (now it is with TOTEM) —> Andrea
    • Control rack: to modify power supply and electrical cable (still with TOTEM) —> Patrick/Michal
  • R134a recuperation
    • ???
    • Added line of Air for the R134a recuperation
    • Add line for iC4H10 exhaust this week —> on-going
    • To check for supply of 220 V + 400 V (Lauda) —> Patrick
    • To understand logic in case of presence of leak/iC4H10 —> Roberto/Nicola Broca

 

LHCb #2046

  • RICH1
    • in Run with CO2
    • Re-fill with CO2 but we take 600 ppm because the pump took Air —> to think what it can be done to avoid Air intake at the re-start of the system
    • We are taking O2: 5 ppm/5 day —> to keep an eye
  • RICH2
    • need to finish installation of by-pass to re-inject into the mixer
  • GC
    • PC is working but not the GC —> today company will come to check
  • SciFi
    • Electrical work done
    • Finishing mechanical work (N2 connection done)
    • Profibus cable not pull in the right way: instead of being in series it is in “parallel” —> to check what it can be done

 

PIQUET

  • elog 894
    • Several problems due to power cut
    • ALICE MTR needed to go in place due to profibus alarm
    • Difficult to re-start CMS DT: to understand what is difficult
    • MDT problem with the humidifier: to verify the flow in the VAISALA
    • Also SX5 mixers re-started

 

GENERAL

 

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