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Gas systems project
GAS M&O meeting 29 June 2020
Present: Beatrice, Roberto, Patrick, Kacper, Fred, LPh, Gianluca, Fabio, Federico
Indico: https://indico.cern.ch/event/932267
ALICE #no elog
No discussion. Several items discussed the week before and status unknown.
ATLAS #2602
No checklist
MDT
- P&ID test with Gianluca (elog #2576) to check results—> Kacper/Gianluca
From previous meeting:
- Reset of pressure sensors giving problem (elog #2489)
- To check the grounding
TGC
- On-going activities to weld —> to prepare a plan of how many days are still needed
CSC
- MFCs installed
RPC
- Rack 65 in open mode: to check results —> Kacper/Gianluca
- New mixer for BIS to finish this week —> Fabio
- To prepare a list of things to do (mechanical+ electrical) when we will stop the system for the end of the week —> Kacper/Michal
From previous meeting:
- to add test of all pressure sensors for dummy chambers in the elog —> Kacper
- missing chassis to control the valves of new racks—> Patrick
- 3rd purifier finished (water cooling): maintenance procedure to do
TRT
- System will restart soon
- MFCs installed
- Maintenance when system will be off
From previous meeting:
- Kacper to check for regeneration of purifier material
- Maintenance to do
MM
- construction mixer on-going
- chassis ordered in May, so not yet delivered
- not possible to put the software as planned
CMS #2589
Andrea on holidays. Below items that were planned for last week. To check with Andrea the status
No checklist
RPC
- two flowcells in errors but difficult access in the rack (#3 in rack 85, #7 in rack 81) —> Michal/Andrea
- to prepare a map of where the dummy chambers are installed —> Andrea/Aleksandar
From previous meetings
- 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
- check pressure sensors of pre-distribution and distribution with Patrick’s calibrator —> Andrea/Mara
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
PGS
- It looks like there is something inverted in side A and B of SF6 (see attached picture in the elog) —> Michal to check
LHCb #2601
RICH1
- In run in closed-loop —> Mara too check the status
RICH2
- IR dismounted and given to Kostia, bronkhost pressure regulator added
- Leak found in mixer between black panel and mixer
- compressor module work started
- New compressor module: found pump for the purifier gas recuperation but it is the last one. Nobody know if it passed the aging test —> aging test to foresee
- Problems with Coriolis: work on-going—> Leonardo/Mara
- To prepare the list of material still needed for the RICH2. Without list, no orders —> Fred/Patrick
MWPC
From previous meetings
- GC analysis of correct MWPC gas mixture to check MFC —> Mara
- to foresee leak search when CO2 analyser will work correctly
PGS
From previous meetings
- Leak in He line —> Patrick to send an email to David
PIQUET
ALICE PGS SF6
- https://eloggas.web.cern.ch/GAS_PIQUET/1095 —> Beatrice to send an email to David
ATLAS MDT
CMS RPC
- no elog
- warning on buffer pressure, probably due to a change of purfifier
GENERAL
- LS2 planning
- Planning updated with FSU used (available in DFS)
- Usually we use a bit more FSU than foresee and in general we use more months than foresee
- We have to try to stay in the dates foresee
- Maintenance
- Only Kacper filled the excel file —> all experiment responsible to fill asap
- 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
- Aging test
- LHCb CO2 IR, David’s presser sensors, CF4 membrane, LHCb RI2 Coriolis, RI2 pump purif, RPC new exhaust flowmeter, black flowmeters Omron (ordered by priority)
- ATEX pump
- Small stock of pumps: no available anymore in the market. No small atex pumps found on the market —> Fabio to search for new ATEX pumps
From previous meeting:
- Level of PGS sometimes is > 100% —> Michal to check
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