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Status Update on LHC Operations: Beam Dumps, Losses, and Stabilization (26-27 Oct)

This report provides a comprehensive overview of the LHC operations on October 26-27, detailing key events including injector issues, beam dumping due to slow losses, and stability checks. Notable milestones include successful injections with 424b beams, multiple ramp cycles, and discussions on BLM (Beam Loss Monitor) thresholds. The report highlights minor concerns regarding vacuum conditions and beam-gas scattering, culminating in stable beams for physics experiments. Observations are discussed in the context of scheduled meetings and machine developments.

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Status Update on LHC Operations: Beam Dumps, Losses, and Stabilization (26-27 Oct)

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  1. Tuesday 26.10. • 08h42: Injection. • SPS transmitter problem (9h39-10h08). • Beams with 3.8e13 p dumped from slow losses at injection. • 12h26: Start ramp, 368b. • 13h35: Stable beams. Fill #1444. • 16h56: Vacuum solenoid off/on. • 20h48: Beams dumped by EIC. 8:30 meeting

  2. Dump 3.8e13p with Slow Losses 450 GeV 83.8 s loss dump Low tunes Neg. vert. chroma TCTVB.4L2 8:30 meeting

  3. Solenoids off/on ATLAS vacuum 8:30 meeting

  4. Losses when Moving RP Nothing worrisome: tertiary halo… 8:30 meeting

  5. Losses in Stable Beams (Linear Scale) … all normal 8:30 meeting

  6. CMS Losses from Lumi 8:30 meeting

  7. Vacuum 8:30 meeting

  8. Fill Reached ~4 pb-1 8:30 meeting

  9. Tuesday 26.10. • 21h14: Increase of various BLM thresholds through monitor factor. • ARC : All monitor factors pushed from 0.3 to 0.5 • Dispersion Supressor. All monitors pushed from 0.3 to 0.5 except: • Empty cryostat monitors (belonging to family THRI_LEIR). • Monitor BLMQI.08L2.B1E20_MQML (belonging to THRI.DS.B1.2_MQM_RC) and BLMQI.08R8.B2E20_MQML (belonging to family THRI.DS.B2.2_MQM_RC) where monitor factor was left to 0.6. • Monitors BLM2I.10L3.B2E30_MQ_MQ, BLMEI.09L3.B2E30_MQ_MQ, BLM2I.09R3.B1I30_MQ_MQ and BLM2I.10R3.B1I30_MQ_MQ where left at 0.3. • This will be changed tomorrow. • 23h18: Interlock beam dump test with 324b. OK. • Night: Laurette filled 1216b per beam (in several fills!) 8:30 meeting

  10. Pressure History Beam Dump 8:30 meeting

  11. Wednesday 27.10. • 01h04: Both beams filled with 424b. Had to dump at 450 GeV to reset QPS_OK on RB_A23/RQF/RQD_A23. Ramp down and pre-cycle. • 02h46: Injection. • 04h06: Start ramp. 424b. • 04h23: Beam dump just after arriving to 3.5 TeV. TCTH.4R8.B2 BLM in IR8 triggered on 0.6s running sum. A few 10’s seconds before saw strange loss patterns. Beam-gas scattering? • 05h26: Injection. • 07h21: Start ramp. 364b. • 07h27: Beam dump due to SIS error on beam energy (timing telegram or something else?). Beam dump fine. 8:30 meeting

  12. 424b Losses 3.5 TeV 8:30 meeting

  13. Vacuum CMS 8:30 meeting

  14. Vacuum ALICE 8:30 meeting

  15. Ahead • ATLAS has now 39.37 pb-1. Last week: 15.7 pb-1. • Now: CMS deicing. Injector RF intervention cancelled. • Until 14h00: LHC machine development at 450 GeV. • 14h00: Recover for physics. Set up for stable beams with 424b. • around 16h30: Stable beams. Then physics until Thursday afternoon. • Afterwards 50ns commissioning. 8:30 meeting

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