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LHC Operations Report: Beam Management Challenges and Physics Progress Updates

This report covers the operational activities at the Large Hadron Collider (LHC), including beam injections, stable beams, beam dumps, equipment malfunctions, meetings, and physics experiments. Key events such as beam tripping, circuit detector stalls, beam squeezes, RF voltage issues, and parasitic machine disturbances are documented. Attention is given to topics like emittance blowup, integer resonance, and abort gap population. The report also outlines goals for beam intensity and physics data production. The challenges faced in managing the beams and conducting physics experiments are discussed, along with efforts to optimize beam performance and overcome technical glitches.

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LHC Operations Report: Beam Management Challenges and Physics Progress Updates

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  1. Monday 30.05. • 01:00 Injection for physics fill #1816 • 02:00 Stable beams fill #1816, luminosity ~1.2x1033 cm-2s-1 • 11:08 Beams dumped. QPS trigger on detector of RCBXH2.L1. • Circuit detector stalled prior to the event (cause no clear but radiation not excluded even likely) and automatically RESET by watchdog. • The trip occurred during the RESET. • 12:01 – 13:17 CMS access. • 13:43 Injection of 2 nominal bunches per beam. • 15:39 Beams in collisions, optics squeezed, RP at proposed physics settings. • 15:43 Beams dumped when switching off the RF for asynchronous dump test. New SIS interlock on RF voltage was not masked. LHC 8:30 meeting

  2. Monday 30.05. • 16:31 Injection of probe beam. • 16:53 No further beam from PS. • Cannot do asynchronous dump test with probe beam (orbit effects). • Parasitic MD to approach integer resonance. Reached 0.03… • 18:49 Beam back from PS. • 19:32 Ramp with 2 nominal bunches. • 20:10 Adjust mode. Squeeze done. • 20:20 Beams dump FMCM: electrical glitch due to storm. • 20:40 Another glitch: we tripped the RD34.LR3 • 21:41 Injection. • 22:07 Ramp • 22:58 Collision, squeeze done, RP’s in, RF off for debunching. • 23:10 Asynchronous dump test. LHC 8:30 meeting

  3. Parasitic MD: Integer Resonance QV QH Beam Intensity  Integer resonance is very narrow! LHC 8:30 meeting

  4. Parasitic MD: Integer Resonance LHC 8:30 meeting

  5. Parasitic MD: Integer Resonance LHC 8:30 meeting

  6. Abort Gap Population LHC 8:30 meeting

  7. Losses: To be analyzed in detail… LHC 8:30 meeting

  8. Tuesday 31.05. • 01:47 Injection • 02:25 Emittance blowup. 450 GeV beams in LHC dumped. Booster optimizing. • 03:36 Injection 1092b. • 05:55 Stable beams #1822. • 06:22 Beam dump. UFO. • 07:16 Injection for physics fill, 1092b. LHC 8:30 meeting

  9. Emittance Blowup B1/B2 V To be understood… Real 100% emittance growth or instrumental effect? LHC 8:30 meeting

  10. Physics 1092b LHC 8:30 meeting

  11. UFO: Q5 or IR2 injection kicker? LHC 8:30 meeting

  12. Incoming Goal of the week: Produce > 250 pb-1 LHC 8:30 meeting

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