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Gas systems project
GAS M&O meeting 20 January 2020
Present: Beatrice, Roberto, Fred, Patrick, Kacper, Andrea, Michal, Mara, Federico, Fabio, Sabino
Indico: https://indico.cern.ch/event/879657/
ALICE #2189
- MTR
- Alarm in power supply: DC MCB trip —> Michal/Patrick to check
- Start with standard gas mixture on Thursday and to add water to humidifier
- No access full week 4
Reminder:
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- exhaust pressure regulation does not work
- mixer pressure regulation does not work: Zimmerli not installed
- CPV
- Probably water in pipes —> try to flush with N2
Reminder:
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- Start to reconnect the detectors but in one channel there is overpressure, probably coming from the pipe: LPh is investigating
- TPC
- Still leak present, system is running in Ar
- Problem of deltaP in TPC for the purifier due to metal frité —> LPh to solve
- TRD
- Fred stop the second column
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
- Alarm on power supply
ATLAS #2192
- CSC
Reminder:
-
- After the power-cut there was not communication with PLC: damage of differential circuit breaker —> to repair
- MDT
- To discuss procedure for pump changed
- On-going work for pump
- Safety valves under calibration
- Add a second H2O sensor for the exhaust and use this one to regulate
- For MDT a big PLC is needed: Michal ordered
Reminder:
-
- In general: several problems with pressure sensor in MDT. Patrick said to add a resistance in the channel
- General
- Power of bande chauffant —> Patrick/Kacper
CMS #2185
- RPC
- barrel now in nominal flow
- dummy chambers ready —> RPC people to install
- iC4H10 MFC doesn’t work correctly —> to try to change to the second line
- in 5 days we manage to have good gas mixture under gas recirculation with a flow in the mixer of 600 l/h
- RE-3 #67 reading of flowcell is 50 l/h (but we are sending 200-300 l/h and the input pressure correspond to the one we had before) while RE-4 #68 is reading 260 l/h: Michal checked mapping, motherboard, calibration file and ELMBs and they are fine —> to investigate: Andrea to check flow with drycal
- Federico to put in the elog the summary file of the pressure sensors of RPC
- Fabio to put an elog of leak test with sniffer: at least 3 points with high leak rate
- Reminder:
- Missing quick manifold and flowcell in barrel +1 and +2
- Swap of pipes in rack RE-1 (racks 61 and 65) and RPC 3.1 (racks 63 and 87)
- Rack 85: to check if dummy chamber is installed, if yes to add pressure sensor connection
- DT
Reminder:
-
- Difficult to re-start the gas system after power-cut —> to do some tests
- 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
Reminder:
-
- 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 start this week
LHCb #2190
- RICH1
- last week: 1.5% of Air
- stopped because the pressure in the loop was too high —> to do GC analysis
- to change the MFC of CO2 in order to be able to check the CO2 injection: we have 30 l/h of CO2 —> ok to install to start and to have PID very low
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
Reminder
-
- To do a O2/N2 measurement before the stop —> Mara
- General
- Interlock of Ar/H2 does not work —> Michal/Patrick to check
- Crash of Auxiliary PLC —> to understand
- Patrick explained how to re-start it and to have the file of the crash
- Module Profibus and PLC can be touched only by Michal and PLC people
- Also problem with Profibus cable/connector.module —> to understand where —> Patrick
PIQUET
- Nothing to report
GENERAL
- MFC calibration campaign preparation
- All ok: only to swap the two lines of MWPC
- Mixer module maintenance presented by Sabino
- Everything in dfs
- Mixer not stable in exhaust: no problem, it has to be stable only when it is in run
- In two weeks at least one mixer for experiment and it is very important to give comments
- R134a recuperation by Mara
- Explication of the system and of first tests
- To check DPT001, add DPT for iC4H10 buffer volume
- Recuperation tried at 300 l/h
- 10/15 small cycles to empty the second buffer volume
- Time of regeneration of purifier 1 was too long and it was saturated: this happened with the software upgrade: every time there is an upgrade of software to check if recipes are saved —> Michal
- Still some SF6 and iC4H10 in the output of R134a recuperation —> to check
- Some problems to fix
- Flowcell summary by Mara
- ATLAS TGC there is Iodine
- Some flowcell have Ag other Platinum: which are the new one?
- T understand what to do with the TGC flowcell: change flowcell with brand-new in one rack?
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