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LHC Operations Update: Fill #2728 and #2729 - RF Synchro Loop Corrections and Beam Stability

This report details the operational updates from June 13th, specifically regarding beam fills #2728 and #2729 at the LHC. Initial luminosities reached 6.5e33 cm²/s, with significant integrated luminosity achieved. The RF synchro loop functions were corrected following identified errors affecting high-energy stability. Various operational challenges, including beam dumps and temperature monitoring of MKI systems, were addressed, ensuring progress was made despite delays. Future improvements and discussions are planned for ongoing operations and efficiency.

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LHC Operations Update: Fill #2728 and #2729 - RF Synchro Loop Corrections and Beam Stability

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  1. Wednesday 13th June 07:06 Beam dump fill #2746. Produced 142 pb-1. Electrical perturbation. ALICE and LHCb tripped. 3 PC on FMCM. 09:00 Update of RF synchro loop functions. Test of RF blow-up at injection. 10:16 re-injecting probes and injection for physics 11:41 Fill # 2728 Stable Beams. Initallumi's 6.5e33 cm-2s-1 23:35 Beams dumped by operator. Integrated lumi about 170 pb-1 01:30 MKI temperatures OK again. About one hours wait. Some problems with PM. 04:00 Fill #2729 Stable Beams. Initial lumi 6.5e33 cm-2s-1. 07:29 Beams dumped by BLM self trigger. Integrated lumi 68 pb-1 LHC 8:30 meeting

  2. RF (Philippe & Team) • RF functions corrected • Two RF functions piloting the RF Synchro Loop (slow loop making the RF track the ramping frequency and keeping collision in the centre of detectors in physics) were not programmed correctly during the ramp (and in physics as this is extrapolated from end-ramp). • The problem was solved by "re-generating" the functions. The change is minimal at injection but large at 4 TeV. • The two functions had never been trimmed. The errors were present in 2011, and probably there since 2009... With the new (correct) settings, the Synchro Loop should be more stable at high energy. • Worked well in the next ramp • Batch by batch blow-up at injection • Did not work • RBAC privileges issues, so that phase noise excitation could not be started on the first 12b batches injected. Cannot be solved in the allocated time -> revert for physics fill LHC 8:30 meeting

  3. Fill #2728 – anything more to say? RF Access Twice good turnaround, despite ‘special tasks’ Good initial lumi Fill lasted… LHC 8:30 meeting

  4. Fill #2729 Losses on B2 only at start of squeeze, seen on previous fills, were not there on the last fill. LHC 8:30 meeting

  5. MKI temperatures Relative plot Five temperatures just above threshold, including MKI.8D.Down Absolute plot MKI.8D.Down hottest and cannot increase limit LHC 8:30 meeting

  6. Planning ahead LHC 8:30 meeting • Delivering luminosity… • To be done… • RF: • Synchro loop control functions: corrected • Long. blow-up at injection: tried it, to be re-visited after TS • New filling scheme: 6 non colliding bunches for ATLAS/CMS • Under discussion • Impact of TETRA on hump / beam. • 30 mins at injection with probe bunches. • Access: • TCLIB.6R2.B1 electronics and LVDT sensor. • MAD PM15: motors of inner doors not working (at least 4 hours). • BI in Pt4 (3-4 hours, working hours). • TOTEM vacuum gauge (3 hours). • MCBV18.L4B1 and RCO.A12.B1 to be repaired. • LBDS Check/repair Ethernet connection on FEC cfc-ua63-mkdtspm. 1 hour during working hours, N. Magnin. • Collimator cooling check TCT IR8 – Oliver Aberle.

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