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LHC Status Report: Beam Failures, Repairs, and Recovery Updates (Friday to Saturday)

This report covers the status of the LHC from Friday morning to Saturday, detailing beam interruptions, equipment failures, and repair efforts. On Friday, software interlocks and equipment malfunctions caused temporary beam loss, with repairs on the RF system and access granted to ATLAS. Late Friday, a faulty temperature sensor was identified. Saturday saw initial collision issues, orbit corrections, and problems with the injection region, alongside recovery efforts. The team continues to ensure system reliability while monitoring vacuum and beam stability.

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LHC Status Report: Beam Failures, Repairs, and Recovery Updates (Friday to Saturday)

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  1. Friday morning • 06:32 Beam lost just after collisions (840 bunches) • software interlock on the voltage of a BLM card. • Re-injection interrupted to allow for an access in ATLAS • RF also in to repair L2B1 klystron. • Cryo point 6 • The RF team got stuck underground because the PZ45 lift was blocked. • The piquet has been called to repair the lift, teamcame out from the PM but their material leftdown. • Precycledthe machine while waiting for piquet. LHC status

  2. Friday afternoon • 14:00 lost the cryo maintain in MSR7 t0wards the end of the precycle. • faulty temperature sensor on RQTL9.R7B2 – see over • Access required • RF back in PZ45 to pick the stuff they had left behind due to the lift outage (the lift is functioning now). • Atlas also in shadow • 17:20 Access over • Pre-cycle • 19:20 Probes in LHC status

  3. Faulty temperature sensor on RQTL9.R7B2 • Le canal redevientoperationellorsque la chaine de mesureesttemporairementouverte à n’importequelleniveau du cablage et pas exclusivementauniveau C50: d’ou nous suspectons un problemecapacitif? • Le problemen’etant pas reproductible, nous avons decide de switcher les cables* des amenées 1 à 6(C50_2) avec  celles de 7 à 12(C50_3) tout en corrigeant les adressagessur le systeme de controleafin d’être transparent au niveau de la supervision. • Cette operation nous aidera à diagnostiquer plus précisement la source du probleme: sonde, electroniqueoucablage. • Nicolas Vauthier; Richard Mompo LHC status

  4. Friday to Saturday • 21:13 Ramp started • Note vacuum activity • 21:39 Beams dumped in squeeze • Trip of RQTF.A23B2 • QPS on tune feedback RT trims (an infrequent again) • Noisy tune signal horizontal plane • 23:15 Filling again • 00:55 Colliding • Beams dumped by UFO on the MKI.D5L2.B1 LHC status

  5. Saturday morning • Back at 450 GeV problems with the orbit in the injection region. Cannot correct it and also the FB is not able to correct. • Tweak trajectory. Dump and re-fill… • Same problem with BPMWI.4L2.B1 and BPMSX.4L2.B1 and had to introduce a local orbit correction. • 05:49 Colliding again • beams dumped by an UFO again during optimization • The instantaneous luminosity for the previous fill went up to 1.11e33 Hz/ub The intensity per bunch was adjusted in the SPS to the nominal and the emittance was around 2.3-2.6, as measured in the SPS on the 36b. Next time we wait 30 minutes at 450 GeV after finishing injection LHC status

  6. Saturday morning • 08:00 Re-injecting some phase control issues in SPS • Cured by Daniel jumping up and down in Faraday cage • 08:45 Lost sector 81 • RB81 quench loop opened.. • Recovery ongoing LHC status

  7. Vacuum LHC status

  8. UFO 1 LHC status

  9. UFO 2 LHC status

  10. UFOs MKI Tobias Baer LHC status

  11. MKI UFOs Tobias Baer LHC status

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