RPC weekly meeting

Monday 5 Aug 2024, 09:00 → 10:30 Europe/Zurich

5/R-026 (CERN)

Davide Boscherini (Universita e INFN, Bologna (IT)), Giulio Aielli (INFN e Universita Roma Tor Vergata (IT)), Mohamed Zaazoua (University of Science and Technology of China (CN))

Weekly meeting about the RPC system activities

09:00 → 09:15 Communications to/from the gas group

Speakers: Beatrice Mandelli (CERN), Enrico Pastori (INFN e Universita Roma Tor Vergata (IT)), Gianluca Rigoletti (CERN), Giulio Aielli (INFN e Universita Roma Tor Vergata (IT)), Kacper Kapusniak (CERN), Roberto Guida (CERN)

09:15 → 09:25 RPC LVL1 status

Speakers: Claudio Luci (Sapienza Universita e INFN, Roma I (IT)), Gian Luigi Alberghi (Universita e INFN, Bologna (IT)), Marco Sessa (INFN e Universita Roma Tor Vergata (IT)), Massimo Della Pietra (University Federico II and INFN, Naples (IT)), Sabrina Perrella (Sapienza Universita e INFN, Roma I (IT))

09:25 → 09:40 RPC Dectector Status

Speakers: Daniela Katherinne Paredes Hernandez (University of Hong Kong (HK)), Eric Ballabene (University and INFN, Bologna (IT)), Mr Mohamed Zaazoua (University of Science and Technology of China (CN))

• BML.C.11.CO.Ly0 HV channel driving high current on 29th July [e-log].
  • HV channel tripped after reaching ~250uA, no current visible in the gas gaps. HV channel ramped down to 9300V.
    
    
• BML.B.09.PI.Ly0 HV channel driving high current on 29th July [e-log].
  • BML1A09.PI.DP2.Ly0.DZ1 gas gap driving high current. HV channel ramped down to 9300V.
    
    
• BMS.A.04.CO.Ly0 HV channel driving high current on 29th July [e-log].
  
  • HV channel tripped after reaching ~180uA. Gas gap current are relatively not high. Icalib increased from 179uA to 185uA. HV channel ramped to nominal HV.
    
    
• BML.B.15.CO.Ly1 HV channel driving high current on 29th July [e-log].
  •  HV channel tripped due to BML2C15.CO.DP2.Ly1.DZ1 gas gap driving high current. HV Vconfig set to 9200V.
    
    
• BMS.A.16.CO.Ly0 HV channel driving high current on 30th July [e-log].
  • HV channel tripped due to BMS3A16.CO.Ly0.DZ2 and SPC4A16.CO.DP2.Ly0.DZ1 gas gaps driving high current. HV Vconfig set to 9200V.
    
    
• BML.C.01.CO.Ly1 HV channel driving high current on 30th July [e-log].
  • HV channel tripped due to BML3C01.CO.DP1.Ly1.DZ2 and BML3C01.CO.DP2.Ly1.DZ2 gas gaps driving high current. HV channel ramped down to 9150V.
    
    
• BML.C.11.CO.Ly0 HV channel driving high current on 30th July [e-log].
  • HV channel tripped due to BML3C01.CO.DP1.Ly1.DZ2 and BML3C01.CO.DP2.Ly1.DZ2 gas gaps driving high current. HV channel ramped down to 9150V.
    
    
• RPC FATAL in side A/C and INFRASTRUCTURE due to 4 boards that went into unplugged status on 31st July [e-log, e-log, e-log].
  • Firstly masked, recovered the following day sending the reset command to the affected crates on the CAEN crate console. Recovered 4 A3512AP HV modules, 2 A3801 ADC modules. All mainframes were reset.
    
    
• BOS.A2.02.CO.Ly1 HV channel driving high current on 1st August [e-log].
  • HV channel tripped due to BOS4A02.CO.DP2.Ly0.DZ1 gas gap on the other layer driving high current. HV channel ramped down to 8800V.
    
    
• BOS.C2.16.CO.Ly1 HV channel driving high current on 2nd August [e-log].
  • Overcurrent already at 3660V, HV channel masked and turned off.
  • RPC resynchs in multiple sectors due to the noise bursts, leading to multiple stopless removals and towers killed [e-log].
    
    
• BOL.C2.07.CO.Ly0 HV channel driving high current on 3rd August [e-log]. 
  • HV channel ramped down to 7000V due all connected gas gaps starting to drive high current from around 16:50.

09:40 → 09:55 Noise issue

Speakers: Claudio Luci (Sapienza Universita e INFN, Roma I (IT)), Mr Mohamed Zaazoua (University of Science and Technology of China (CN))

09:55 → 10:05 Resin update

Speakers: Ahmet Renklioglu (Istinye University (TR)), Dr Aydin Ozbey (Istanbul University-Cerrahpasa (TR))

• A detailed brainstorming session was conducted with Elif Tug and Amine İclal Akın to address the issues that need to be resolved for R&D. Possible experimental setups for the systematic tests of the new injection machine were considered.

• Our first objective is to test the quality of the foam produced when the machine is operated at a pressure that does not damage any components inside the box.

• Additionally, the necessary arrangements were made for the training of two engineers/graduate students who will be working on Gas Repair Operations in the ATLAS Cavern throughout YETS 24/25. Their training in the laboratory is scheduled to be completed within three weeks.