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Fill 1743

Fill 1743 . Specific luminosities. Beam spot. Thursday morning. Fill lost to slow beam loss on vacuum pressure bump R8. Dumped on long running sum TCTVb.4R8 . LHCb confirms that it was a real event, their BCM had a similar signature as the losses on the TCTVb . . Vacuum layout R8.

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Fill 1743

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  1. Fill 1743 LHC 8:30 meeting

  2. Specific luminosities LHC 8:30 meeting

  3. Beam spot LHC 8:30 meeting

  4. Thursday morning Fill lost to slow beam loss on vacuum pressure bump R8 LHC 8:30 meeting

  5. Dumped on long running sum TCTVb.4R8 LHCb confirms that it was a real event, their BCM had a similar signature as the losses on the TCTVb. LHC 8:30 meeting

  6. Vacuum layout R8 LHC 8:30 meeting

  7. Thursday continued • After dump, access required for: • SEU on QPS controller on RB 34 • quench heater power supply in S81 • 14:00 Beam back • 15:23 Start ramp • 16:15 Stable beams – 1744 • 44% UFO BLMQI.30L1.B1 • Went up to 51% of dump threshold on TCTVB R8... Clear vacuum spike. Event seen on the BRAN on R8! • Orbit has a very different reading in IP7 from before - temperature effect. • Performance not brilliant - blown-up trailing bunches, trailing trains… LHC 8:30 meeting

  8. Emittances Reyes Alemany LHC 8:30 meeting

  9. Bunch instabilities seen by ADT pick ups LHC 8:30 meeting

  10. Thursday continued The faulty FrontEnd is cfc-ccr-ctlxtim whose powersupply is tripping the whole barrette. The FrontEnd first line team is changing this crate now. Pierre Charrue plus some cleaning up afterwards • 16:59 #1744 Beams dumped • Communication problem: RF, TCDQ, • SIS says no LHC 8:30 meeting

  11. Fill 1745 20:57 Start ramp 21:41 Stable beams LHC 8:30 meeting

  12. 450 GeV - tactics LHC 8:30 meeting

  13. BSRT in stable beams LHC 8:30 meeting

  14. Night shift summary Nothing to report: 8 hours of stable beams - Walter & Eric LHC 8:30 meeting

  15. Incoming • Stable beams this morning • Access • QPS controller reset (SEU) • AGK checks – 2 hours with beam at 450 • before next step-up • 624 again • Seek approval for next step (768 bunches) LHC 8:30 meeting

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