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Gas systems project
GAS M&O meeting 13 May 2019
Present: Beatrice, Patrick, Michal, Andrea, Fred, Gianluca, Kacper, Mara, Luca
Indico: https://indico.cern.ch/event/819411/
ALICE #no elog (LPh in sick leave)
- MTR modification: under discussion with Arturo —> LPh to order the pieces: to be ready for the PLC replacement (10/06)
- MTR pipes for dummy chamber: Arturo said no manpower available until July
Reminder:
- MTR problem with humidifier (with GC we measure 1/3 of H2O with respect to the beginning of the test) —> LPh to investigate
ATLAS #1803
- RPC
- Mixer: problem with C2H2F4 MFC —> Kacper replaced MFC with a small one: now we are at 3% R134a
- TRT
- They need new pipes in distribution racks in 2-3 weeks—> Kacper
- TRT envelop problem with flow read out when we are in fast readout —> Kacper/Michal to investigate
- MDT
- Change of run alarm delay from 3h to 1h —> to change to 5 min
- TGC
- Missing 18 V power supply —> not reading of flow of CO2 —> Kacper/Patrick to check
Reminder:
- Flowcell for new RPC racks —> Kacper to give the flow necessary —> to decide if 3 or 5 mm
CMS #1799
- DT
- They think to have a deviation in MFC of low flow —> to keep in mind
- to add the differential pressure sensor on pump filter —> this week —> Andrea
- RPC
- RE-3 and -4 installed, missing electronics in RE-3
- Pre-distribution 3.1 it is in top or bottom? —> Beatrice to check
- Need to inject RPC gas mixture in few channels: Andrea will use the purge line that will be sent in the channels requested. The problem is that 200-300 l/h are needed: will the mixer be ok (R134a max flow is 2500 l/h)?
- Andrea found a new regulation valve to test for the pre-distribution —> Luca to buy
- SX5 mixer
- need to start
- to change range of MFC and fill humidifier
- GEM
- Missing quick and flexible pipes in GE2/1
- Purge and back-up in CO2 —> missing line and manifold —> to connect to the TOTEM line
- Missing 4 return lines from ZEC in GEM pre-distribution —> this week
- Ar and CO2 MFCs to change with the new one and to install safety valve in distribution rack
- Other
- Problem with PGS in SF6 in the scale of battery —> Michal to investigate
- Problem in flowcells for all gas systems (especially RPC where there is not anymore reading) —> problem fixed: http://eloggas.cern.ch/GASSYSOperation%26Maintenance/1798
LHCb #1804
- RICH1
- in Run with CO2
- to monitor the Air content with the Analysis Chain (O2) and with GC for N2 (every two weeks) —> Mara
- RICH2
- In Run —> need to start recuperation asap
- MFM for the membrane installed —> start test 14/05 —> Mara/Beatrice/Patrick
- RIX installed —> this week check of welding
- Battery full of N2 —> to empty —> Patrick
- to investigate for dry air compressor if it is possible to build with our grease —> Luca
- SciFi
- Pre-distribution almost ready —> next week to send in P8
Reminder:
- MWPC in run with Ar/CO2
- Rack 64 —> to investigate
PIQUET
- Nothing to report
GENERAL
- Elog “Gas System Status” updated
- By-pass filter pump: https://indico.cern.ch/event/819411/contributions/3424014/attachments/1843124/3022831/25-03-2019_GAS-reunion2.pdf
- To do with 3-way valve
- Kacper to check diameter of pipes and buy material with Fred
PLC/Software
- Discussion on Mixer in WinCC-Oa for the choice of gas in each line. Two possible solutions
- Addition of text in order to write manually which gas will be used —> ok for LS2
- To have the possibility to choose between two calibration curves of MFC and based on the curves choose, the gas type appears in WinCC-Oa —> for LS3
- Beatrice suggested to add a label or number for each gas type in order to have the history of which gas was used —> for LS3
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