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LHC Status Update: December 1st Operational Insights and Preparations for VdM Scans

On December 1st, checks were completed for Lumi scan limits in preparation for upcoming VdM scans, involving trims of up to 150 μm in IP1 and IP2. The day included dump #2334, several stabilization phases, and resolution of technical issues regarding bunch configurations for IONS. Stable beams were achieved by 15:30, while significant events were captured for Alice’s analysis. The evening saw a successful injection procedure after adjustments. Ongoing optimizations and testing strategies are in place, aiming for effective future operations within the LHC.

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LHC Status Update: December 1st Operational Insights and Preparations for VdM Scans

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  1. Thursday 1st December • Lumi scan limits checked (in preparation for next fill VdM scans). • Trims of up to 150 um per beam in IP1 & IP2 both planes both beams were done (IP5 is equivalent to IP1). • 10:45 Dump #2334 • Fill for VdM • Some problems with 200ns_352b_344_324_0_24bpi15inj_IONS bunch/batch configuration • Ended with 200ns_352b_344_324_0_24bpi15inj_IONS2 • Check LDM on flat-top – Adam Jeff LHC status

  2. LDM analysis Beam 1: Satellites 0.31% Ghosts 2.5% Beam 2: Satellites 0.29% Ghosts 2.4% LHC status

  3. Thursday afternoon • 15:30 Stable beams • Alice VdMs +/- 6 sigma; length scale scans… LHC status

  4. Thursday evening • 18:20 scans finished • hold beams for 2e6 events for Alice • 21:15 dump beams • At 22.10 pilots were injected and after corrections dumped • The IPOC of the TSU for B1 failed during the dump and caused the block of the XPOC for B1. • Expert was called and after careful analysis of the situation and of a dry dump he confirmed the system works fine but further offline analysis is needed. LHC status

  5. Friday morning • Some delay filling • SPS RF • LINAC3 • 04:20 Stable beams #2336 LHC status

  6. BGI optimization ongoing Mariusz LHC status

  7. Alternate blow-up method Start SB After 3 hours 1. To-morrow morning we check the created RF spectrum on a test bench in the lab. No effect on operation 2. To-morrow afternoon we run a dry test on the machine without beam. Can be done during ramp-down for example 3. Monday? Test with beam at injection energy. 30 min should be enough. Can be done when ready to fill. That will provide a rough scaling of the new method vs. the old one (in term of bunch lengthening vs. rms phase noise) 4. Monday, Tuesday or Wednesday. Test in the ramp with a least 2 batches evenly spaced around the ring. We could also go for a full physics filling. Philippe Baudrenghien LHC status

  8. Today • Re-fill for Van der Meer scans • ADT 15 minutes check of bunch mask to verify that it is working correctly and no changes are necessary. • 200ns_352b_344_324_0_24bpi15inj_IONS2 • normal "high intensity" 200ns ion batches • Verify satellites and ghost charge with LDM • ATLAS & CMS • Re-fill for physics… LHC status

  9. Incoming • ADT: physics fill with gated damping (24 bunches not damped) to assess possible coexistence damper/BBQ measurement • Use bunch mask to inhibit damping for a normal Physics fill. Do not change any other parameters. The only risk here is that the first bunch train with no damping will suffer more blow-up • Ion Quench test MD (> 8 hours). Proposed for Mon 5/12 LHC status

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