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Gas systems project
GAS M&O meeting 22 June 2020
Present: Beatrice, Roberto, Andrea, Patrick, Kacper, Fred, LPh, Gianluca, Fabio, Federico, Leonardo
Indico: https://indico.cern.ch/event/930103/
ALICE #2585
TOF
- need to stop gas system to do a modification in power-supply —> end of the week
- change of pump 2 weeks ago, this week change of membrane to plan (Kacper)
- leak test in surface and CR5 done with Fabio, few small leaks found but they are not the 15 l/h leak we have. Need to test distribution racks
- new GC analysis needed to check if we took air after the stop —> Mara
TPC
- HF MFC removed for calibration
- PLC upgrade: TPC should stop the 20 of July, maybe a delay of few weeks. We will know on Friday
From previous meeting:
- Kacper in contact with company for compressor maintenance. As soon as he has new, he’ll let us know
TRD
- new valves installed in recuperation module: to check for software
- HF MFC dismounted
- For LF MFC, LPh to coordinate with Kacper since we can dismount after one injection (usually every 3 days)
CPV
- humidifier installed but not all sensors/valves are shown in WinCC-OA —> LPh to check with Michal
- final commissioning of system to be done
- still in one distribution line there is no gas in the return but the problem is on detector side
MTR
- new dpt in pump’s filter installed but probably scale wrong —> to fix
- piquet problem of las t week to check (https://eloggas.web.cern.ch/GAS_PIQUET/1088)
- mixer MFCs installed: maintenance procedure to do
ALL
- modifications on all power supplies done for ALICE gas systems (except TOF) but there are some software problems —> Michal too check
- need to stop TOF gas system to do a modification in power-supply: end of the week
ATLAS #2584
MDT
- P&ID test with Gianluca (elog #2576) last week: to check results—> Kacper/Gianluca
From previous meeting:
- Reset of pressure sensors giving problem (elog #2489)
- To check the grounding
TGC
- On-going preparation to start weld this week
RPC
- Rack 65 in open mode: to check results —> Kacper/Gianluca
- New mixer for BIS to finish this week —> Fabio
- cabling (connectors) of dummy chambers done
- to add test of all pressure sensors in the elog —> Kacper
- cabling (connectors) of distribution racks on-going in cavern and USA (https://eloggas.web.cern.ch/GASSYSOperationMaintenance/2586)
- missing chassis to control the valves of new racks—> Patrick
- 3rd purifier finished (water cooling): maintenance procedure to do
TRT
From previous meeting:
- TRT people asked to re-start system at the end of this month
- Kacper to check for regeneration of purifier material
- Maintenance to do
CMS #2572
RPC
- two flowcells in errors but difficult access in the rack (#3 in rack 85, #7 in rack 81) —> Michal/Andrea
- membrane of pump 1 changed
- problem in rack 83: warning received (https://eloggas.web.cern.ch/GASSYSOperationMaintenance/2577)
- it looks like somebody disconnected the pressure sensor of dummy chamber that is used as reference for the regulation valve —> high increase of chambers pressure
- Anton and Aleksandar informed
- still missing 7 dummy chambers to install: waiting for ZEC (beginning of July)
- to prepare a map of where the dummy chambers are installed —> Andrea/Aleksandar
- Test on regulation valve (ECONEX) on-going at Meyrin. As soon as ready, installation of new ECONEX in rack 70
From previous meeting:
- Still problem with iC4H10: set iC4H10 MFC at 4% to have 4.5% in IR
- Increase ~ 250 l/h: we are working at very low range of MFCs (~10-20%) so error can be big. Three steps:
- Increase the flow to ~600-800 l/h and perform GC analysis —> Andrea/Mara
- Calculate benefit of having a R134 MFC with a max flow of 1000 l/h or having a not-ATEX MFC —> Beatrice
- Check possibility of bring R134a and SF6 MFCs outside the rack —> Andrea
CSC
- stop and start of the rack to check problem of elog #2518: flow in distribution racks didn’t change but the flow read by Krohne changed from 6 m3/h to 4m3/h, which is the same reading of flowcells
- next step for this week: check pressure sensors of pre-distribution and distribution with Patrick’s calibrator —> Andrea/Mara
- after the stop the exhaust MFC didn’t open because the PID Kc was very low. Andrea changed from 0.01 to 0.5
- there should be two sets of PID: start and run: where are they? —> Michal to check
- exhaust flow of CSC is oscillating between 400 l/h and 600 l/h
DT
- HF MFC to install
- GC analysis to do when we move to high flow —> Mara
- to check with DT people when we can dismount LF MFC for calibration
GEM
- Second pump installed
- new network plug for GEM will be installed end of July
- New rack for GEM monitoring arrived in SGX5. This rack doesn’t belong to Gas Team. All help/modification has to go to CMS GEM BC except the pipe that we have to pull from mixer to the top of the rack
PGS
- It looks like there is something inverted in side A and B —> Michal to check
LHCb #2578
RICH2
- mixer maintenance done: results in DFS
- compressor module work started
- IR module almost completed
- New compressor module: to find the pump for the purifier gas recuperation
- Reading of Coriolis is negative and it reads ~ 500l/h without flow —> Leonardo/Mara
MWPC
- valve of analysis of mixer replaced
- to foresee leak search when CO2 analyser will work correctly
From previous meeting
- GC analysis of correct MWPC gas mixture to check MFC —> Mara
PGS
- Leak in He line: Federico found a leak in pressure regulator —> Patrick to send an email to David
- CF4 line of MWPC will be also used for RICH2: Fred and Patrick met David. David asked for a BC: this is not M&O but it is PGS. David to find money
PIQUET
ATLAS MDT
GENERAL
- LS2 new planning of the experiments
- Beatrice show the last planning of LS2 prepared by experiments: https://indico.cern.ch/event/930103/contributions/3909700/attachments/2060574/3456314/LS2scheduleExperiment.pdf
- Two possible scenarios:
- closing of caverns by November 2021
- closing of cavern by February 2022 (but low intensity beam test already in September 2021)
- Final decision will be taken in October 2020
- It is too early to ask to each single detector when they will need gas systems, so until October 2020, we will consider closing caverns by Nov 2021, i.e. all gas systems will need to be ready and operational at least ~3 months before
- Basically our planning is just shifted of the 2-3 months of covid
- Maintenance
- The procedures are here: dfs//Departments/PH/Groups/TA1/Gas_group/002_LS2/MaintenanceProcedures
- Results have to be added here: dfs//Departments/PH/Groups/TA1/Gas_group/002_LS2/MaintenanceResults
- New excel file to keep trace of what has been done for the maintenance —> to be filled by each experiment responsible
- MFC calibration campaign well advanced
- To do this week: ALICE MTR Exhaust and Humidifier, ALICE TPC and TRD HF
- ALICE TRD LF Xe: LPh to coordinate
- CMS DT: to check with DT people when we can move to open mode to take the LF MFCs
- List of activities after Covid reviewed and upload in indico page
- PGS calibration bottles
- Where are we? —> Michal to resume
From previous meeting:
- Level of PGS sometimes is > 100% —> Michal to check
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