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Gas systems project
GAS M&O meeting 02 December 2019
Present: Beatrice, Roberto, Fred, Patrick, Kacper, Andrea, LPh, Gianluca, Mara, Federico, Fabio
Indico: https://indico.cern.ch/event/862139/
ALICE #2107
- MTR
- PLC crashed for the second time after a power-cut: PLC changed with a new one —> Michal is investigating
Reminder:
-
- exhaust pressure regulation does not work
- mixer pressure regulation does not work: Zimmerli not installed
- CPV
- Start to reconnect the detectors but in few channels there is overpressure, probably coming from the pipes: LPh is investigating
- TPC
- Start to put Neon in the TPC
- Still leak present
- 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 #2102
- CSC
Reminder:
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- 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
- Working on the distribution racks
- Reminder
- Mixer instability since 6th November: injection increased of 250 l/h
- Kacper said nothing seen in the flowcell: you see a step in the total flow of the flowcells on the 05 November —> Kacper to check from where it is going
- TRT
- Problem with web-mass —> Michal to check
- w2 and w3 2020: general power-cut: piquet to stop the system on 05 January
CMS #2103
- RPC
- ON: RB0, RB+1, RB+2
- Installation of differential pressure sensors for filter
- Dummy chambers installation on-going
- Missing quick manifold and flowcell in barrel +1 and +2
- PTxx04 was oscillating of ~1 mbar: this was due to the MFC of the exhaust that was flushing —> PID adjusted
- Bubblers of back-up disconnected now that we are in N2
- DT
- Difficult to re-start the gas system after power-cut —> to do some tests
Reminder:
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- Test for power cut and re-start for the exhaust line —> to do other tests
- CSC
- Install of differential pressure sensor on the pump and Krohne flowmeter done
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 #2108
- RICH1
- in Run with CO2
- 1.5 ppm of O2 every 2 days
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
- from 27th re-start recuperation
- now we are at 2.7% of CF4 left in the system
- SciFi
- Commissioning on-going
PIQUET
- General power-cut
GENERAL
- LPh show the new plan of CLOUD for the dismounting
- Reconstruction in 2020 —> LPh to give to Beatrice the time and dates
- Overview of planning LS2 for the month of December. To add
- MTR modification back-up
- MicroMegas
- Overview of projects for 2020-2021 by Roberto
- R134a recuperation plant
- SHINE-RPC
- ND280-TPC
- Purifier drawing in WInCC-OA is wrong —> to prepare a drawing to show next meeting —> Beatrice
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