Gas systems project
GAS M&O meeting 09 December 2019
Present: Beatrice, Roberto, Fred, Patrick, Kacper, Andrea, LPh, Gianluca, Mara, Federico, Fabio
Indico: https://indico.cern.ch/event/868910/
ALICE #no elog
- MTR
- Alarm in power supply: DC MCB trip —> Michal/Patrick to check
- This week and next week: tests with GC/MS
Reminder:
- mixer pressure regulation does not work: Zimmerli not installed
- exhaust pressure regulation does not work
- CPV
- Start to reconnect the detectors but in few channels there is overpressure, probably coming from the pipes: LPh is investigating
- TPC
- Still leak present
- Regulation valve of the pump is fluctuating a lot: very high PID —> LPh/Michal to fix
- MCH
- System restarted
- TRD
- Alarm on power supply
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 #2118
- CSC
Reminder:
- After the power-cut there was not communication with PLC: damage of differential circuit breaker —> to repair
- MDT
- Rack 63: again problem on one channel reading: at this point is not the ELMB/motherboard but an electrical problem —> Michal/Patrick to investigare
- Pump + H2O analysis logic: to discuss with Michal
Reminder:
- In general: several problems with pressure sensor in MDT. Patrick said to add a resistance in the channel
- RPC
- One membrane of the pump broke after 1200 hour
- Flow reduced to minimum with the zimmerli to decrease input pressure form ~10 mbar to 3 mbar
- Rack 65: PT6526 is miscalibrated. It reads -0.4 mbar when the system is in stop or in back-up
- Rack 62: zimmerli of back-up too high. It created a shock on the chamber of ~ 2mbar —> back-up pressure reduced
- Xmas holidays
- Only TFC and MDT will run: to stop on the 5th
- w2 and w3 2020: general power-cut: piquet to stop the system on 05 January
CMS #2114
- RPC
- Presentation from Gianluca/Sabino about CMS RPC status
- https://indico.cern.ch/event/868910/contributions/3663039/attachments/1958743/3254641/CMS-RPC_gas_meeting_20191208_1.pdf
- All dummy chambers ready
- ON: all barrel
- ENDCAP: several problems (see Gianluca’s presentation)
- Rack 85: to check if dummy chamber is installed, if yes to add pressure sensor connection
- Reminder:
- Missing quick manifold and flowcell in barrel +1 and +2
- DT
- Difficult to re-start the gas system after power-cut —> to do some tests
Reminder:
- Test for power cut and re-start for the exhaust line —> to do other tests
- CSC
Reminder:
- Warning to set-up —> Beatrice/Michal/Roberto
- GEM
- Ga system working fine
- Rack 61 with detector, rack 62 with all by-pass
- Flowcells problem in rack 61: ch 3, 5, 7, probably a leak in the connectors of the patch panel of GEM —> Mara to check with Daniel
- R134a recuperation
- To understand logic in case of presence of leak/iC4H10 —> Roberto/Nicola Broca
LHCb #2119
- RICH1
- in Run with CO2
- Mara to prepare a summary for Air contamination
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
- < 1% of CF4 —> stop the system and leave in back-up for Xmas holidays
- To do a O2/N2 measurement before the stop —> Mara
- SciFi
- Commissioning on-going
PIQUET
- General power-cut
GENERAL
- Xmas status of gas systems: only ATLAS done
- Xmas gas consumption: missing ALICE
- To prepare all pipes for the membrane pumps to put in place —> Kacper
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