GAS M&O meeting 29 April 2019
Present: Beatrice, Patrick, Roberto, Michal, Andrea, Fred Mara, Gianluca, Luca
Justified: Kacper, LPh
Indico: https://indico.cern.ch/event/815795/
ALICE #no elog
From previous meetings:
- MTR problem with humidifier (with GC we measure 1/3 of H2O with respect to the beginning of the test) —> LPh to investigate
ATLAS #no elog
- RPC Mixer: problem with C2H2F4 MFC
- To change MFC with a small flow —> Patrick/Kacper
From previous meetings:
- Flowcell for new RPC racks —> Kacper to give the flow necessary —> to decide if 3 or 5 mm
CMS #no elog
- GEM
- Pneumatic pipes not in place —> found temporary solution
- Missing cables CANBUS and PROFIBUS from USC to SGX5 —>Michele/Daniel
- Valve mounted on the other way in the rack pump!!!
- Cables without marks —> Patrick needed to re-check everything
- ELMB test for distribution racks
- Software will be completed later
From previous meetings:
- RPC pre-distribution need to modify two racks for RE3.1/4.1
LHCb #1789
- RICH1 in Run with CO2
- a lot of Air —> to do a purge
- after the purge to monitor the Air content with the Analysis Chain (O2) and with GC —> Mara
- RICH2 in Run —> need to start recuperation asap
- need to install RIX
- missing one MFM for the membrane —> Patrick
- to investigate for dry air compressor if it is possible to build with our grease —> Luca
- MWPC in run with Ar/CO2
- Rack 64 —> to investigate
- OT racks dismounted
- Some racks in building 21, other racks under RP controls
PIQUET
GENERAL
- Presentation of Mara on LHCb RICH2 (https://indico.cern.ch/event/815795/contributions/3405074/attachments/1835476/3007134/lhcbrich2.pdf)
- 40000 liters of CO2 interjected
- in total now we have 40% CO2 + 2% Air while in December we had 8% CO2
- 35000 l of CF4 lost in 4 months!
- Presentation of Gianluca on CMS Ventilation test (https://indico.cern.ch/event/815795/contributions/3409588/attachments/1835479/3007149/ventilation_test_29_04_2019.pdf)
- It looks like no effect on RPC were seen (but cavern was not completely closed)
- Purifier 3 —> to discuss logic and hardware. Here first drawings: http://eloggas.cern.ch/GASSYSOperation%26Maintenance/1777
PLC/Software
- Discussion of planning
- CSC and DT need to change the festo module
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