GAS M&O meeting 30 September 2019

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

Indico: https://indico.cern.ch/event/851652/

ALICE #1974

• MTR
  • exhaust pressure regulation does not work
  • mixer pressure regulation does not work: Zimmerli not installed

Reminder:

• • Dummy chamber: Arturo said he has no manpower to install the pipes
• TPC
  • Rack pump re-building done: to do leak test
  • 7th —> 14th October: final connection for TPC for the gas system

Reminder:

• • LPh to prepare a summary on how the system is now —> in 2 weeks
• TRD
  • Purifier: found dust of copper from the cartridge material (elog 1980)
  • Pump: found particles in the pump module

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 #1973

• TFC
  • Temperature pump: ~170 C but it is “normal” with the new pump
  • Roberto explained the new configuration to run the TFC system (elog 1970)
    • Distribution rack 4: settings have been changed
• RPC
  • MFC of R134a repaired last week —> to re-install this week
  • Mixer flow not stable since a while (elog 1967)
  • Discussion on the pressure regulation of the second line of the mixer: the pressure has to be at least 150 mbar lower than the one of the system
• MDT

Reminder:

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

CMS #1966

• RPC
  • OFF
  • Modification of purifier filters on-going —> last week and this week
    • with T valves, we have only 5. we put a cap for the sixth one

Reminder:

• • Rack 85: problem of pressure sensors in error —> Michal/Patrick to check
• CSC
  • Stop analysis rack of CSC to check if the spikes of regulation valves are coming from the this —> Andrea

Reminder:

• • Problem on distribution: strange peaks in the regulation valve and some alarms due to low pressure in the rack —> to investigate
  • To check and correct level of oil in bubblers of distribution
  • Warning to set-up —> Beatrice/Michal/Roberto
• GEM
  • 1 chamber in purge in CO2
  • Try to run the system but system was not stable: pump in negative pressure
• R134a recuperation
  • Add line of Air for the R134a recuperation
• General
  • Open/close plugs during open days and last Monday: 2 mbar more in the cavern caused a stop of CSC distribution racks

LHCb #1971

• RICH1
  • in Run with CO2
• RICH2
  • Regeneration of purifier done last week
  • Membrane 2 is still old one and it is not efficient —> we will not use
  • Then we will need to move to Air: waiting for the compressor. But then it will be the detector people to put Air inside
• SciFi
  • To connect pipes for the racks of distribution and mixer
  • Chassis: still 2 weeks of work
  • To finish the system by October
• GC
  • PC is working but not the GC —> Mara to contact the company

Reminder:

• MWPC in run with Ar/CO2
  • Rack 64 —> to investigate

PIQUET

• TFC temperature pump: ~170 C but it is “normal” with the new pump
• CLOUD
  • Discussion on the trace gas MFC and valves

GENERAL

PLC/Software