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LHC Operations Update: Beam Status, Fill #1865, and Improvement Plans

Summary of LHC operations on Sunday, including beam fills, beam dumps, maintenance, and discussions on optimization and future improvements. Details on different meetings held and adjustments made during the day.

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LHC Operations Update: Beam Status, Fill #1865, and Improvement Plans

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  1. Sunday 12th • 00:29 Stable beam fill #1864. Initial lumi 1.1e33 • 07:17 beam dumped by trip of RD2.L1 • Integrated lumi 23 pb-1 • 10:30 Cryo maintain back • 11:30 Injecting - some injection steering • 13:56 Stable beam fill #1865. Initial lumi 1.1e33 • 03:22 Beams dumped, collimator interlock • Integrated lumi42 pb-1 • 05:00 Access for change of power converter • 07:13 Injecting probe beam LHC 8:30 meeting

  2. Trip of RD2.L1 Michel Combe Bus-bar quench, following cryo valve control problem Heaters fired, quenched RD2.L1 Vacuum valves in around RD2.L1 following vacuum spike,2.1 s after dump request by PIC LHC 8:30 meeting

  3. Fill #1865 – LHCb levelling problem Richard Jacobsson • We went for too high with the optimize all routine for LHCb which went up to 600 (ub.s)^-1! It looks like we were heads on in Vertical and completely OFF in Horizontal. The Optimize All (in H plane) put us too much in collisions. We tripped LHCb. • Put manually LHCb to 250 (ub.s)^-1 on request of LHCb, with levelling OFF • Smoothly restarted the leveling 1/2 hour later @ 300 (ub.s)^-1 • Short term improvements to prevent this in the future LHC 8:30 meeting

  4. Including fill #1865: @ 915 pb-1 LHC 8:30 meeting

  5. Integrated efficiency indicator Temperatures Bunch length • MKI profiting from the longer bunch lengths • Like cryo, collimators,.... LHC 8:30 meeting

  6. Plan • Physics 1092 x 1092 bunches, trains 144 bunches • Not for today • Physics 1236 x 1236 bunches, trains 144 bunches • rMPP approval procedure OK • After RF main power coupler conditioning, which would otherwise be at the limit • Outstanding • End of fill: TCL adjustment • Q’ decay following long fill LHC 8:30 meeting

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