GAS M&O meeting 23 June 2022

Present: Beatrice, Roberto, Patrick, Fred, Kacper, LouisPhilippe, Mara, Gianluca

Indico: https://indico.cern.ch/event/1173684/

ALICE #4204

• TRD: to move pump regulation valve —> LPh w26
• TOF: problem of O2 intake
  • to check mixer injection —> Gianluca w26
• TPC back-up in error
  • Vaisala sensor to check —> w27
• MID: the two pumps behave differently! For piquet: if pump need to be changed --> to go in place
  • to check non-return valve of pump —> LPh w26
• AUX: check O2 calibration for 1 day —> LPh w26

ATLAS #4198

• RPC: back to std gas mixture today/tomorrow
• MDT: stop due to maintenance on CO2 line --> gas system off if mixer off —> to check logic with Philip and if ok, change to not stop the mixer if mixer off (to set also alarm delay in mixer) —> Gianluca w26
• ID flushing: work on-going for humidity problem with CO2 —> Kacper w26-27
• CO2 line with high flow --> to check Kacper
• to check alarm FG and ODH failure with Nicolas Broca —> Gianluca w26-27

CMS #4197

• CSC: O2 sensor problem to fix —> Andrea w26
  • MFC Ar in force mode to check for profibus problem: important to fix as we cannot move to HF —> Patrick w26
  • third pump to buy —> Kacper w26-27
• RPC: test on-going for R134a recuperation, injection of mixer is changing
  change of PID for some regulation valves —> Mattia w26 and 27
  SF6 concentration at 0.35% with GC analysis —> Mara to check with RPC team —> w25
• GEM: suspect problem on zimmerli in mixer

LHCb #4206

• RICH1 and 2: alarm on mixer injection now active
• RICH1: summary of test performed + conversion mass/flow —> Maria Cristina w27
• RICH2: to complete set-up for IR and to do calibration —> Mara/Patrick w26-27
• RICH1 and 2: add vaisala in volume buffer for testing column —> Patrick w26
• MWPC exhaust MFC fluctuating —> Mara w27

GENERAL
- KNF black pumps: 3-4 to fix —> LPh with Herve —> w26 (pumps needed for IR)
- ANALYSIS CHAIN: to have Ar and to put in long cycle before O2 and H2O calibration (software)

ALICE —> LPh w26
ATLAS —> Kacper w 27 (to check with LPh how to implement)
CMS: Mara said it is ok
LHCb —> Patrick w26 (to check with LPh how to implement)
CMS: modify long cycle: now every day (too short) —> Mara w26

• Aging test vaisala —> mara w26

TS September
- CMS DT analysis rack installation (start in MD)
- CMS GEM: installation of 1 um filter in common supply and return (stop of system needed) + check zimmerli mixer
- LHCb RICH1 cleaning (start in MD)
- CMS CSC: movement of exhaust regulation valve in USC?