RPC weekly meeting

Monday 28 Jul 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

09:15 → 09:25 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)

09:25 → 09:35 Detector and trigger reports

Speakers: Claudio Luci (Sapienza Universita e INFN, Roma I (IT)), Daniela Katherinne Paredes Hernandez (University of Hong Kong (HK)), 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))

Cavern intervention on 23/07/2025 (Mohamed, Sinem, Giulio) [e-log]:

• Fixed the issue with the Iee current of the BML6A01.CO Vee channel [e-log].
  Found to be due to a retracted pin in Vsense patch panel and a sligthly tilted connector on chamber [e-log]
• Some gas gaps where having high ohmic current and were disconnected rack side, some gas gaps to be reconnected.

 

ADC board issue on 27/07/2025 [e-log]

• Location: Y_2904_X7_C2/H1/br02/crate0/slot08, Model: A3801, Status: 10, Temp: 0, Fsm: b040070, Mask: 1, Hw: H1:br02.ch013.
• ADC board for Igap readout was propagating fatal and masked. BOL6A01.CO.DP2.Ly0.DZ1 gas gap giving NOT READY behind, with very high, possibly fake, Igap readout (123 uA). The DCS ramped down its HV channel, BOL.A.01.CO.Ly0.RO, to 5010V. Changing a bit v1 for the HV channel, the Igap readout does seem stuck. I have kept v1 to 5010V for safety reason and masked the HV channel. ADC board to be recycled. Also red octant 1 to be fixed [e-log]

LVL1/DAQ trigger pad power cycles (Marco, Claudio) [e-log]

• Software power cycle performed on RPC trigger tower s11_t4 because one OHP histogram in PAD_in_DAQ was showing entries of tower 4 shifted to tower 0 since few runs. The issue in the OHP histogram called "PAD and SL fragments per sector" was fixed.
• Hardware power cycle performed on RPC PAD BMS5A16 because of higher trigger rate from trigger tower s62_t4 (~15 kHz), but the trigger tower s62_t4 still showed high rate later (~15 kHz, ~5 times higher w.r.t. other towers of the same trigger sector).

 

Other

• Trigger efficiency to be monitored (https://atlas-rpc-perf.cern.ch/RPCWeb/Timing/) after gas gap disconnections.
• BOL3A15.CO.Ly1 gas gaps working on 2024, left disconnected this year.
• BOS1C04.CO.Ly1 gas gaps working on 2024, disconnected on 13/09/2024, left disconnected this year.

09:35 → 09:45 Vth tuning in noisy trigger towers

Speakers: Claudio Luci (Sapienza Universita e INFN, Roma I (IT)), Eric Ballabene (University and INFN, Bologna (IT)), Giulio Aielli (INFN e Universita Roma Tor Vergata (IT)), Sinem Simsek (Istinye University (TR))

09:45 → 09:55 Resin update

Speaker: Ahmet Renklioglu (Istinye University (TR))

09:55 → 10:05 Efficiency studies

Speakers: Claudio Luci (Sapienza Universita e INFN, Roma I (IT)), Daniele Truncali (INFN e Universita Roma Tor Vergata (IT)), Marco Sessa (University Federico II and INFN, Naples (IT))