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Friday 01/06

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

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Friday 01/06

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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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