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LHC Operations Update: Power Converter Testing & Beam Stability Analysis - Fill #2691

On Friday, we completed the replacement of the power converter RQTF A81B2 and conducted thorough testing. Continuous tune measurements faced interruptions for both B1 and B2 during the ramp process. In the Morning Meeting led by G. Arduini, we addressed beam instability and optimized settings to achieve stable collisions, noting impressive luminosity figures around 6.3-6.4x10^33 cm^-2s^-1. Emittance and beam dump incidents were discussed, alongside pending checks related to temperature spikes affecting operations.

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LHC Operations Update: Power Converter Testing & Beam Stability Analysis - Fill #2691

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  1. Friday 01/06 08:30 Access for power converter RQTF.A81B2 replacement (radiation effect on auxiliary power supply) finished and power converter tested 08:30-09:30 RF control (phase error) adjustments 10:18 Continuous tune measurement stopped working in the middle of the ramp for B2 and later for B1. Tune feedback stopped for B2 and then B1. Rebooted front-end. Restarted tune feedback. LHC Morning Meeting - G. Arduini

  2. Emittances at flat-top (#2690) Horizontal Vertical F. Roncarolo LHC Morning Meeting - G. Arduini

  3. Fill#2690 • Warning levels on BLMs: • At the end of the ramp: • BLMEI.06R7.B2I10_TCSG.A6R7.B2, 83.8 s, 31% • BLMQI.04L6.B2I10_MQY, 5.2 s, 31% • During the squeeze: • BLMQI.04L6.B2I10_MQY, 5.2 s, up to 48% • BLMQI.05R7.B1E30_MQWA.E5R7, 5.2 s, 40% • 11:00 Beam dump when going in collision (BLMQI.04L6.B2I10_MQY, 5.2 s) LHC Morning Meeting - G. Arduini

  4. Fill #2690 • Dump occurred ~10 s before the end of the collision process • ATLAS at ~50% of peak lumi, CMS at ~6% of peak lumi in spite of the incorporation of trims found with 36 on 36. Some ideas on how to improve further…. LATLAS BLM TCP LCMS LHC Morning Meeting - G. Arduini

  5. Fill #2690 No sign of instability Losses distributed among all bunches 1-5-8 1-5 Suspected tune settings following stop of tune feedback and collision offset in IP5 particularly G. Papotti

  6. Fill #2691 No losses above warning during ramp and squeeze Losses on some bunches when going in collision. Ended up with beam separated in IP5 28 mm (~1.5 sigmas full separation V) and In IP1 by 14 mm (full separation H) LHC Morning Meeting - G. Arduini

  7. Fill#2691 LHC Morning Meeting - G. Arduini

  8. Fill #2691 LATLAS • Instability developing in collision (B1 H). Managed to optimize point 5 and 1 and to go in stable beams. Results of optimization incorporated. LCMS BBQ-B1H BBQ-B2H LHC Morning Meeting - G. Arduini

  9. Fill 2691 - emittances • Emittances in collision after loss F. Roncarolo Horizontal Vertical LHC Morning Meeting - G. Arduini

  10. 03:39 Trip of ROF.A56B1 (QPS) followed by ROD.A56B1 and RSD2.A56.B1  Beam dump End of fill #2691. ~170 pb-1 in 14 h 07:10 STABLE BEAMS #2692. Initial luminosity ~6.3-6.4x1033cm-2s-1. No problems there. We will try to continue like that…… LHC Morning Meeting - G. Arduini

  11. Pending TCSG check still to do (quickly done) RQTL11.R7B2 temp DFBAN spikes affecting cryo start but not CM (~3 to 5 hours – not urgent) ALICE access (~1.5 h – tracker cooling – needs CV piquet) MAD PM15: motors of inner doors not working Verification of impact of TETRA and GSM transmission on the tunnel (30 mins with pilot beam at injection) LHC Morning Meeting - G. Arduini

  12. Fills of the week LHC Morning Meeting - G. Arduini

  13. Main faults Cryo Pt8 LHC Morning Meeting - G. Arduini

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