GAS M&O meeting 02 December 2019

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

Indico: https://indico.cern.ch/event/862139/

ALICE #2107

• MTR
  • PLC crashed for the second time after a power-cut: PLC changed with a new one —> Michal is investigating

Reminder:

• • exhaust pressure regulation does not work
  • mixer pressure regulation does not work: Zimmerli not installed
• CPV
  • Start to reconnect the detectors but in few channels there is overpressure, probably coming from the pipes: LPh is investigating
• TPC
  • Start to put Neon in the TPC
  • Still leak present
• TRD

Reminder

• • 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 #2102

• CSC

Reminder:

• • After the power-cut there was not communication with PLC: damage of differential circuit breaker —> to repair
• MDT
  • Rack 63: again problem on one channel reading: at this point is not the ELMB/motherboard but an electrical problem —> Michal/Patrick to investigare
  • Pump + H2O analysis logic: to discuss with Michal

Reminder:

• • In general: several problems with pressure sensor in MDT. Patrick said to add a resistance in the channel
• RPC
  • Working on the distribution racks
  • Reminder
  • Mixer instability since 6th November: injection increased of 250 l/h
  • Kacper said nothing seen in the flowcell: you see a step in the total flow of the flowcells on the 05 November —> Kacper to check from where it is going
• TRT
  • Problem with web-mass —> Michal to check
• w2 and w3 2020: general power-cut: piquet to stop the system on 05 January

CMS #2103

• RPC
  • ON: RB0, RB+1, RB+2
  • Installation of differential pressure sensors for filter
  • Dummy chambers installation on-going
  • Missing quick manifold and flowcell in barrel +1 and +2
  • PTxx04 was oscillating of ~1 mbar: this was due to the MFC of the exhaust that was flushing —> PID adjusted
  • Bubblers of back-up disconnected now that we are in N2
• DT
  • Difficult to re-start the gas system after power-cut —> to do some tests

Reminder:

• • Test for power cut and re-start for the exhaust line —> to do other tests
• CSC
  • Install of differential pressure sensor on the pump and Krohne flowmeter done

Reminder:

• • Warning to set-up —> Beatrice/Michal/Roberto
• GEM
  • Ga system working fine
  • Rack 61 with detector, rack 62 with all by-pass
  • Flowcells problem in rack 61: ch 3, 5, 7, probably a leak in the connectors of the patch panel of GEM —> Mara to check with Daniel
• R134a recuperation
  • To understand logic in case of presence of leak/iC4H10 —> Roberto/Nicola Broca

LHCb #2108

• RICH1
  • in Run with CO2
  • 1.5 ppm of O2 every 2 days

Reminder

• • Re-fill with CO2 but we take 600 ppm because the pump took Air —> to think what it can be done to avoid Air intake at the re-start of the system
• RICH2
  • from 27th re-start recuperation
  • now we are at 2.7% of CF4 left in the system
• SciFi
  • Commissioning on-going

PIQUET

• General power-cut

GENERAL

• LPh show the new plan of CLOUD for the dismounting
  • Reconstruction in 2020 —> LPh to give to Beatrice the time and dates
• Overview of planning LS2 for the month of December. To add
  • MTR modification back-up
  • MicroMegas
• Overview of projects for 2020-2021 by Roberto
  • R134a recuperation plant
  • SHINE-RPC
  • ND280-TPC
• Purifier drawing in WInCC-OA is wrong —> to prepare a drawing to show next meeting —> Beatrice