GAS M&O meeting 07 October 2019

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

Indico: https://indico.cern.ch/event/852947/

ALICE #no elog

• 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 (since last week)
  • 7th —> 14th October: final connection for TPC for the gas system
  • Modification to add the filter in the distribution pipe

Reminder:

• • LPh to prepare a summary on how the system is now —> in 2 weeks
• TRD
  • Regulation valve in pump module was oscillating a lot: Michal fixed he problem by changing the PID (elog 1983)
  • In general: not waiting too much time before saying in case of oscillation problem of the valve

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 #1984

• General power-cut
• CSC
  • After the power-cut there was not communication with PLC: damage of differential circuit breaker —> to repair
• RPC
  • MFC of R134a repaired last week and installed
• MDT
  • New P&ID for the pump module: two pumps
  • It is a turbo pump so we need the pneumatic valve normally open
  • Addition of filter in front of the pump to avoid any dust going inside the pump
  • Need to stop the gas system for two weeks to do the modification

Reminder:

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

CMS #1981

• General power-cut
  • We loose the pressure in the FESTO module regulator every time the system stops: there is a default int he module —> Patrick/Fred/Andrea to check
• RPC
  • OFF
  • Modification of purifier filters finished (see picture in the elog)
  • Pneumatic pipes on going (50% done), to finished in week 42

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
  • To modify the réseaux socket for the GEMPLC (now it is with TOTEM) —> Patrick/Michal
  • Control rack: to modify power supply and electrical cable (still with TOTEM) —> Patrick/Michal
  • 1 chamber in purge in CO2
  • Try to run the system but system was not stable: pump in negative pressure (-60 mbar)
• 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 #1982

• 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

• elog 860
  • Heating of purifier not working but it was off because it was not commissioned yet
• elog 862
  • Pump alarm because the pressure in the loop was too high (1.7 bar). After several investigations , it looks like it is the analysis module (exhaust and pump valves in the analysis module) —> LPh to investigate
• ALICE TPC: somebody closed the back-up of CO2 —> LPh to check

GENERAL

• Student (sesec) show the status of electrical drawings
  • Pump module almost ready
  • ELMB2: new firmware will be prepared by a guy
• Commissioning of software: if not finished
  • Put in force mode in WinCC-OA
  • Add an entry in the elog
  • Send an email to gas piquet
• New manifolds
  • Still wrong: Andrea discussed with the main workshop
  • Company wants to do a prototype to check if they will do correctly: 1 week
• Regulation valve
  • The one with PWL

PLC/Software