RPC weekly meeting

Monday 17 Nov 2025, 09:15 → 10:30 Europe/Zurich

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

• List of interventions or pending issues:    follow this link

1 Communication to/from 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)

2 Summary of TS2 interventions

Speakers: Alessandro Polini (Universita e INFN, Bologna (IT)), Claudio Luci (Sapienza Universita e INFN, Roma I (IT)), Enrico Pastori (INFN e Universita Roma Tor Vergata (IT)), Eric Ballabene (University and INFN, Bologna (IT)), Mr Mohamed Zaazoua (University of Science and Technology of China (CN))

3 Detector and trigger reports (incl. BIS78)

Speakers: Alessandro Polini (Universita e INFN, Bologna (IT)), Claudio Luci (Sapienza Universita e INFN, Roma I (IT)), Enrico Pastori (INFN e Universita Roma Tor Vergata (IT)), Enrico Tusi (INFN e Universita Roma Tor Vergata (IT)), Eric Ballabene (University and INFN, Bologna (IT)), Dr Federico Lasagni Manghi (Universita e INFN, Bologna (IT)), Giulio Aielli (INFN e Universita Roma Tor Vergata (IT)), Mr Mohamed Zaazoua (University of Science and Technology of China (CN)), Sinem Simsek (Istinye University (TR))

Summary of RPC interventions in the cavern on 12/11 [e-log]
The following gaps, drawing high current, were disconnected on the chamber side:

• BML2C09.PI.DP2.Ly0.DZ2
• SPC4C10.CO.DP1.Ly0.DZ1
• BMF3A12.CO.Ly1.DZ1

 

BMS.C.10.CO.Ly0 HV channel [e-log]

• The HV channel ramped down due to HvGapSafety for SPC4C10.CO.DP2.Ly0.DZ1 gas gap that was driving high current at 15:44 (20.42 uA 8514V). SPC4C10.CO.DP2.Ly0.DZ1 gas gap masked and HV channel brought back to READY (9000V).
  Current of the gas gap to be monitored. Gas gap to be disconnected in the next cavern intervention.
• High rate of s17_t4 trigger tower (1.2kHz instead of ~1Hz). BMS5C10.PI.Ly0.ETA Vth lowered from 0.7 to 0.3 [e-log].

 

BMS.A.16.CO.Ly1 HV channel [e-log]

• The RPC HV channel BMS.A.16.CO.Ly1 ramped down, giving NOT_READY for RPC, due to SPC4A16.CO.DP1.Ly1.DZ1 driving high current (60uA at 9056V).
  Already at 5000V, the SPC gas gap drives high current (32uA).
  HV channel masked. Gas gap to be disconnected.

4 Plan for YETS

Speakers: Ahmet Renklioglu (Istinye University (TR)), Alessandro Polini (Universita e INFN, Bologna (IT)), Claudio Luci (Sapienza Universita e INFN, Roma I (IT)), Dmitri Kharchenko (Joint Institute for Nuclear Research (RU)), Enrico Pastori (INFN e Universita Roma Tor Vergata (IT)), Giulio Aielli (INFN e Universita Roma Tor Vergata (IT)), Uladzimir Kruchonak (Joint Institute for Nuclear Research (RU))