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Operational Update on LHC Beams and Stability Issues - July 14-15, 2023

This report covers the operational status of the LHC on July 14 and 15, 2023. On the 14th, modifications to the longitudinal damper improved maximum amplitude, but beam instability occurred due to electrical network issues. A temporary fix was implemented to restore supply. The following morning, stable beams with 13 bunches were recorded, and all Roman pots were calibrated to 30 sigmas. Investigations into Hump disruptions took place, and additional low pile-up data for LHCf was proposed. Overall, there were significant challenges and progress in beam stability.

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Operational Update on LHC Beams and Stability Issues - July 14-15, 2023

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  1. Wednesday 14th July • Stable beams • 11:26 All Roman pots to 30 sigma • Modification to the longitudinal damper: increase of max amplitude from 0.6 deg rms to 1 deg rms @ 40 MHz. • 17:03 Lost beams • Multiple FMCM • Instability on the electrical network 17:02:53. • Evening • There is no more limit on the range of acceptable injection bucket number. The previous problem with bucket 29701 is solved... • Alice compensators trip. TI confirmed an electrical instability at the same time (21:47) the two experimental compensators tripped.

  2. Wednesday evening • With a huge effort and a "temporary fix" the MPS team have the supply up and running once more. • “The MPS experts have all understood this temporary fix” • 22:15 Final PSB problem – inverted quadrupole polarity • 22:45 Beam back • 23:49 RF problem at the PS and the injected indiv in the SPS is not clean (it has satellite bunches...).

  3. Thursday 15th July morning • 04:18 Stable beams – fill 1226 • 13 bunches 8_8_8 – providing a truly non-colliding bunch • Scan CMS, LHCb, Atlas, adjust Alice • 1.2 Hz microbarn-1 • 05:55 Totem: All pots are now at 30 sigmas. Starting the acquisitions. • 06:52 All vertical pots moved to 25 sigmas. • Note some FESA issues

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  5. Hump

  6. Today • Stop physics midday • Hump investigations at 450 GeV • GSM off in tunnel ~ 2 hours • [Multi-bunch injection from SPS] • Bren & co – 1 shift – pushed to Friday • Physics • LHCf would like some more low pile-up data - will be tried with one additional colliding pair at IP1/5 with about half nominal intensity - requires some checks at injection. • Single_14b_9_8_8 (with a low pile-up bunch in RF bucket 1) or variant ghosts…

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