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
Reminder:
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- 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:
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- LPh to prepare a summary on how the system is now
- TRD
Reminder
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- 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
Reminder:
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- 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
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:
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- Test for power cut and re-start for the exhaust line —> to do other tests
- CSC
Reminder:
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- Warning to set-up —> Beatrice/Michal/Roberto
- GEM
- Connection of detectors this week
Reminder:
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- 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
- Presentation of Beatrice about LS2 planning
- Presentation of Mara about CMS GEM Gas System commissioning
- Safety valve input and output in the rack are 50 mbar
- Pressure at the back-up is set at 5 mbar
- If you want to work with 2, 3 or 4 racks, you need to modify the manual regulation valve
- R134a presentation