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Tuesday 10 th July & night

This update covers the events from Tuesday's MD, including a pile-up of 65 and 70, lost cryo in section R8, successful ATS ramps, and beta* levelling. Results and plans for future MDs are discussed.

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Tuesday 10 th July & night

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  1. Tuesday 10thJuly & night • 07:36 Dump after high pile-up MD. • Pile-up of 65 (CMS) and 70 (ATLAS) • 08:09 Lost Cryo matching section R8 ('warm bubble'). • 09:16 Cryo back, pre-cycle. • 10:04 Start of 25 ns injection MD. Injecting probe. • 288 bunches injected with high chromaticity • 13:15 End of 25 ns MD. Start pre-cycle for ATS MD. • 14:27 Injection of first ATS probe. • 16:09 First ATS ramp. The intensity was lost when trimming the RF frequency for dispersion measurements. • 18:46 Second ATS ramp followed by squeezing: successful • 03:13 beta*=0.10 m, beam 2 only. • 04:14 ATS beam dumped • 05:05 Injection probe for beta* levelling MD LHC 8:30 meeting

  2. 25 ns MD • Successfully injected 288 b for B1 and 144 b for B2 • Using chromaticity's of +15 both planes • 288 b injection losses at 12% of dump threshold (very good !) with emittances of 3.3 um • Losses along the batch due to e-cloud • 288 b stable with high chromaticity • Trim chroma on B2 down by 10 units on both planes blindly: no effect circulating • Inject 72 bunches with lowishchroma (+3, +5) OK, already some scrubbing effect • Dump on injecting 144 bunches with lowishchroma: beam unstable, BLMs LHC 8:30 meeting

  3. ATS MD & Beta* levelling See MD overview slides Giulia LHC 8:30 meeting

  4. The Plan • Wed 16:00 Finish floating MD (Beta* levelling ongoing) • 90 m run • Roman Pot settings approved • Loss maps: • Betatronloss maps at the end of the squeeze (separated beams), followed by positive off-momentum in physics. • 4 bunches per beam: 2 for ADT loss maps at the end of the unsqueeze, the other 2 bunches to establish reliably collisions for off-momentum. • Asynchdump in physics (with Roman pots in, obviously). • 2 bunches per beam • Wake up the experts to validate loss maps • 90 m data taking during physics run • Filling scheme 650ns_112b_4bpi_28inj_highBeta • If short of time: 525ns_144b_16bpi_9inj_highBeta • Thu 16:00 Back to production OR Split collision beam process. Strategy to be determined today. LHC 8:30 meeting

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