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Monday 21 st January & night

Monday 21 st January & night. 05:20 Injecting 338 bunches/beam fill 3479 08:13 Dump on BLM losses 9L7.B2 , during change of RF frequency at flat top to common RF frequency. 09:00 Access for LHCb who can't take data. 11:20 Cycling. 14:00 Filling for physics 200ns_270p_ 248 Pb_15inj24bpi.

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Monday 21 st January & night

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  1. Monday 21stJanuary & night 05:20 Injecting 338 bunches/beam fill 3479 08:13 Dump on BLM losses 9L7.B2, during change of RF frequency at flat top to common RF frequency. 09:00 Access for LHCb who can't take data. 11:20 Cycling. 14:00 Filling for physics 200ns_270p_248Pb_15inj24bpi. 15:21 Second dump due to losses on BLM 9L7.B2 during RF frequency change. Increase BLM thresholds. 18:15 Injecting physics beam 20:47 Stable beams fill #3481 06:58 Beam dumped by operator Filling for the same again, proton intensity bit larger (2e10) LHC 8:30 meeting

  2. Finally … Vistar time stamp 1 h out LHC 8:30 meeting

  3. Fill #3479 Beams dumped on BLM losses 9L7.B2 at moment of frequency change to bring proton and ions beams on the same RF frequency. LHC 8:30 meeting

  4. Fill #3480 1 unit = 20 ms • Changes: • RF frequency changes in 3 steps with pause of 10 s in between • Rate of change slowed down by factor 4 • Changed filling scheme to 200ns_270p_248Pb_15inj24bpi • extrapolating from fill o-night should not reach dump threshold • Dumped again on same BLM on third frequency step LHC 8:30 meeting

  5. Fill #3481 Before dumped on RS 10 ms • Increased BLM threshold (monitor factor) factor 3 • - BLMQI.09L7.B2I10_MQ (0.1 -> 0.3)- BLMQI.11L7.B2I10_MQ (0.1 -> 0.3) • Some scraping of beam in the SPS • It passed… just: LHC 8:30 meeting

  6. The Plan – needed to increase #bunches 338 Pb 248 Pb 248 Pb 120 Pb BLM limit BLM loss • Increase the limits of the other BLMs in the same way • Q15, Q17, … • Further slow down frequency trim – split third step ? • Move orbit and/or collimators slightly at the primary ? LHC 8:30 meeting

  7. Stable beams • Alice came in too high – adjusted for next fill • incorporated +10 um in the separation for ALICE • ALICE luminosity signal for leveling is quite noisy …. LHC 8:30 meeting

  8. Various • Wire scanners not to be used until checked in tunnel • Preparing for moving in Roman Pot during physics • V/d Meer scans next week Mon/Tue • Access requests: • Wire scanner, J.Emery, point 4, 2 hours. • Collimators UJ33, test position sensors, M. di Castro, A.Masi, 20 minutes. • “Train”, B.Feral, D. Paulic, PM56/UL55, 1 h during working hours • BGI, M.Sapinski, R4, ½ h LHC 8:30 meeting

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