GAS M&O meeting 16 April 2020

Present: Beatrice, Roberto, Andrea, Patrick, Kacper, LPh, Fred, Michal, Mara, Gianluca, Sabino, Fabio, Federico, Leonardo

Indico: https://indico.cern.ch/event/909752/

CHECK Gas Systems

ALICE

TPC

• by mistake LPh started the cO2 absorber and we have a big loss of gas. Problem fixed by piquet

TRD

• two stops due to profibus problem but able to restart as system
• Patrick and Fred went on place: found two profibus connectors not well closed. These connectors were installed with the new PLC
• Profitrace installed in place to check for other possible problems

ATLAS

• nothing to report

CMS

• Lower of gas flow for the chilled mirror of the humidifier
• Humidifier of RPC is stable because is not injecting any water. This is due to the fact that we don’t use the purifiers
• DT pump maintenance:  change of membrane for pump 1 and 3
• Ar/Co2 batteries almost empty. New batteries already at P5

LHCb

• nothing to report

GENERAL

• Chilled mirror needs between 10 and 20 l/h. The lower is the flow, the higher is the time to perform the measurement
• Profibus check has to be done before and after the change of PLC
• Summary of status of alarms done by Mara
• Level of PGS sometimes is > 100% —> Michal to check
• PGS list of sensors not working/not existing: missing ALICE, CMS and LHCb

Actions:

• To prepare a list of sensors not working or missing in PGS —> Experiment technical responsible
• Excel file for alarms prepared weekly by Mara —> Experiment technical responsible to fill