GAS M&O meeting 18 November 2019

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

Indico: https://indico.cern.ch/event/862139/

ALICE #no elog

• MTR

Reminder:

• • exhaust pressure regulation does not work
  • mixer pressure regulation does not work: Zimmerli not installed
• CPV
  • Start to reconnect the detectors
  • There are 5 channels in WinCC-OA while there are 10 in the distribution —> Michal
• TPC
  • Start to put Neon in the TPC
  • Problem with the water cooling of the purifier column: solenoid valve changed has it was blocked
  • O2 analyser: change of cell and calibration
• TRD
  • Missing one signal in the recuperation: Michal fixed

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 #2075

• CSC

Reminder:

• • After the power-cut there was not communication with PLC: damage of differential circuit breaker —> to repair
• MDT
  • Work on-going for 2nd pump

Reminder:

• • In general: several problems with pressure sensor in MDT. Patrick said to add a resistance in the channel
• RPC
  • Mixer instability since 6th November: injection increased of 250 l/h
  • Kacper said nothing seen in the flowcell
  • You see a step in the total flow of the flowcells on the 05 November —> Kacper to check from where it is going
  • RPC people said there was a leak on 06/11 and they repaired on 07/11
  • New manifolds arrived
• TRT
  • Problem with web-mass —> Michal to check

CMS #2070

• RPC
  • OFF
  • Dummy chambers construction on-going
  • Electrical cable of rack 85 to finish (even if it is CMS responsibility)
  • Start foreseen for 26th November
  • Jonathan did the connection of the 3 dummy chambers
  • Rack 85: problem of pressure sensors in error: problem in the cable (UX-US) —> Anton to change it
• DT

Reminder:

• • Test for power cut and re-start for the exhaust line —> to do other tests
• CSC
  • To stop the system to install differential pressure sensor on the pump and Krohne (Tue)

Reminder:

• • Warning to set-up —> Beatrice/Michal/Roberto
• GEM
  • Ga system working
  • Flowcells problem in rack 61:
    • Ch 3 and 7: to regulate the input flow by closing a bit the flowcell
    • Ch 5: to change the output flowcell

Reminder:

• • To modify the réseaux socket for the GEMPLC (now it is with TOTEM) —> Andrea
• R134a recuperation
  • To do:
    • Heating tape for the exhaust pipe
    • compressor test with R134a
    • Piping
    • Add buffer with FESTO volume of 20 liter
  • 22nd: safety and electrical inspection
  • To understand logic in case of presence of leak/iC4H10 —> Roberto/Nicola Broca

LHCb #2074

• RICH1
  • in Run with CO2
  • 1.5 ppm of O2 every 2 days

Reminder

• • 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
• RICH2
  • need to finish installation of by-pass to re-inject into the mixer
• GC
  • Now it is working
• SciFi
  • Electrical work done
  • Commissioning this week
  • Profibus cable not pull in the right way for the analysis trolley: instead of being in series it is in “parallel” —> to check what it can be done

PIQUET

• CMS GEM
  • Regulation valve of the pump was keeping going to zero
  • Kacper went in place to regulate and it disconnected the pressure on the Zimmerli
• ATLAS MDT
  • Problem with the humidifier: not enough pressure to push the gas in the humidifier

GENERAL

• CMS Regulation valve summary by Sabino
  • 4 valves will be installed
• Presentation of Demetrio
• Aging test
  • In a new rotameter from Krohne: connector with glue