GAS M&O meeting 21 October 2019

Present: Beatrice, Roberto, Michal, Fred, Patrick, LPh, Sabino, Federico, Fabio

Indico: https://indico.cern.ch/event/857532/

ALICE #

• MTR

Reminder:

• mixer pressure regulation does not work: Zimmerli not installed
• exhaust pressure regulation does not work
• Dummy chamber: Arturo said he has no manpower to install the pipes. Beatrice said that we (gas team) will not pull the pipes
• TPC
  • Probably a leak to find (see piquet elog 878)
  • Big pump arrived at P2

Reminder:

• LPh to prepare a summary on how the system is now —> this week
• TRD

Reminder

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

ATLAS #2024

• CSC

Reminder:

• After the power-cut there was not communication with PLC: damage of differential circuit breaker —> to repair
• MDT
  • Working on rack 64 and 68 for ELMB cards

Reminder:

• Rack 68 (ch 17): one channel is keeping going to zero —> try to change the ELMB

CMS #2004

• RPC
  • OFF
  • Rack 85: problem of pressure sensors in error: problem in the cable (UX-US)
  • All pneumatic lines tested
  • Feedback valve in exhaust to check —> Patrick
  • Safety valves dismounted for calibration and re-installed
  • Commissioning of the software on-going
• DT
  • Test for power cut for the exhaust line —> to do another test next week
• CSC
  • Moving to Arcal10 for CSC for welding in SGX5

Reminder:

• Warning to set-up —> Beatrice/Michal/Roberto
• GEM
  • Commissioning started: elog 2017

Reminder:

• 1 chamber in purge in CO2
• Control rack: to modify power supply and electrical cable (still with TOTEM) —> Patrick/Michal
• To modify the réseaux socket for the GEMPLC (now it is with TOTEM) —> Andrea
• R134a recuperation
  • Add line of Air for the R134a recuperation
  • Add line for iC4H10 exhaust this week

LHCb #2026

• RICH1
  • in Run with CO2
• RICH2
  • New pieces for high pressure for the recuperation of CF4 —> to install this week
• GC
  • PC is working but not the GC —> Mara to contact the company 
• MWP
  • Change motherboard in rack 66: now it is working fine. Still difference between the racks —> to change also the others?

PIQUET

• elog  879
  • LHCb RICH2 stop —> to modify PID that are not able to follow for the regulation valve
• elog 878
  • ALICE TPC stop —> too low pressure at the input of the pump —> potential leak? —> to investigate
• elog 876
  • CLOUD: problem with Naphtalene: not possible to control the MFC —> LPh to check
  • Exhaust temperature TE7906 does not correspond to the one you see in place and in WinCC-OA it is in the wrong place

GENERAL

• Presentation of Mara about the LHCb RICH 2 recuperation

PLC/Software