GAS M&O meeting 02 April 2020

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

Indico: https://indico.cern.ch/event/904368/

CHECK Gas Systems

• All OK

ALICE

• Ne level alarms to change
• List excel done with Gianluca
• GC analysis of TOF are ok: they are as expected

ATLAS

• N2 Dewar refilled
• Excel check-list on-going

CMS

• CSC battery almost finished but second one is there. 2 new batteries will arrive next week
• Elog 2368: started to check if the exhaust pressure regulation
• DT pump: to plan intervention to change the membrane —> Andrea + Kacper

LHCb

• PGS alarms blocked for gases not used

GENERAL

• Beatrice checked with David for aging test: all new sensors of Airliquid have to go through aging test
• Geraldine did some test of PGS alarm to have the name of the building in the SMS (needed for David’s equipe)
• Discussion on SMS for warning

Actions:

• Prepare a list of sensors in force mode —> Experiment technical responsible + Mara/Gianluca
• To look at alarms and warning for the gas system ON —> Experiment technical responsible
• 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

REMINDER for when we will be back

ALICE

CPV

• We have 3 lines input that are ok, and 3 lines output: in one there is not the return. LPh contacted Yuri

TPC

• In the purifier the small thermic box triggered (also last year it happened) —> Patrick/LPh to check

TRD

• Recuperation: missing two valves but there are present in the software
• Purifier: to review if keep the safety valve or the rupture disk
• Purifier: safety valve at the input where we have Ar or Ar/H2 at high pressure —> LPh to check with safety

ATLAS

MDT

• Check overpressure in MDT chamber when there is a stop-start of the system
• Only one convertisseur, one pump, etc from the system —> Patrick/Kacper to fix
• Found a problem of grounding on pressure sensors: pressure sensors changed. Now to verify if the grounding problem is still there
• Problem in the 2 vaisala of humidifier: several spikes present. Not clear why. Before the software upgrade they were not present

CMS

RPC

• Michal changed the mother board in rack 67: now flow is 170 l/h (elog #2279) —> Andrea to check with new voegtlin red

DT

• Change one motherboard in rack 61 but flow didn’t change (elog #2280) —> to try to recalibrate one set of flowcells
• Difficult to re-start the gas system after power-cut —> to do some tests
• Test for power cut and re-start for the exhaust line —> to do other tests

GEM

• Andrea prepared a drawing for ME0 and check for space in UX —> Andrea to send an email to Michele

CSC

• On-going regulation of PID for the exhaust —> Beatrice
• Warning to set-up —> Beatrice/Michal/Roberto

LHCb

MWPC

• Problem in the GC analysis of the mixer: not visible the correct gas mixture with both LF and HF. Probably an hardware problem (connection, valve, etc) to find —> Mara
• Leak in Mixer and Exhaust. Only in Exhaust found but not repaired. Other not yet founded —> Patrick

RICH2

• To inject Air —> Patrick to check with C. Frei
• To add line for analysis “supply to detector”k

SciFi

• Problem on 3-ways valve —> Patrick

PGS

• Interlock of Ar/H2 does not work —> Michal/Patrick to check

GENERAL

• Alarms/Errors in power supplies for all gas systems —> Patrick