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what were the issues in 2011, minimizing impact and improving recovery

Evian 2011. Technical Stops:. what were the issues in 2011, minimizing impact and improving recovery. Acknowledgments: S.Claudet , K.Dahlerup , F.Duval , K.Foraz , M.Nonis , M.Poyer , H.Thiesen , J.Uythoven , W.Venturini. M.Solfaroli. Outline. General view Methodology

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what were the issues in 2011, minimizing impact and improving recovery

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  1. Evian 2011 Technical Stops: what were the issues in 2011, minimizing impact and improving recovery Acknowledgments:S.Claudet, K.Dahlerup, F.Duval, K.Foraz, M.Nonis, M.Poyer, H.Thiesen, J.Uythoven, W.Venturini • M.Solfaroli

  2. Outline General view Methodology The 5 TSs one by one Pulling the numbers together Conclusions M.Solfaroli - Technical Stops

  3. General Overview Time allocated for recovery: 1 day 23 % of global time = TUNNEL INTERVENTIONS (including Xmas break) M.Solfaroli - Technical Stops

  4. Methodology • GOALS: • Spot out possible correlations between recovery time and TS interventions • Identify major problems • Investigate strategies for improvement • HOW IT HAS BEEN DONE: • All TS interventions screened and all recovery issues examined • Some beam checks need to be done repetitively (i.e. loss maps)...should they be considered as part of recovery time? YES! • What does represent the limit between recovery and operation (back in SB, back on program, first beam in,...)? M.Solfaroli - Technical Stops

  5. TS#1 28 – 31 March – 4 days + 1 recovery day 3243 keys given • WHERE WERE WE? • Slot of 1.38 TeV operation • Last 3.5 TeV physics fill (1645): • 200 b (24 bpinj) - (ready for 296 b) • ~1.22E11 p per bunch • Peak lumi: 2.5E32 cm-2 s-1 10% 30% 60% GOAL of the week Recovery from TS and start preparation for high intensity M.Solfaroli - Technical Stops

  6. TS#1 - Recovery Start of HWC Global CRYO start Inj region aperture measurements for higher intensity First pilot Dump @450GeV MKB.B2 CRYO Recovery Beam comm TS t Thu 31st 6.25pm Fri 1st 10.29am Fri 1st 9.59pm Sat 2nd 01.23am Sat 2nd ~2pm Mon 28th 7am 10% 24% 66% M.Solfaroli - Technical Stops

  7. TS#2 09 - 12 May – 4 days + 1 recovery day 2831 keys given • WHERE WERE WE? • Last 3.5 TeV physics fill (1755): • 768 b (72 bpinj) • ~1.25E11 p per bunch • Peak lumi: 9E32cm-2 s-1 16% 24% 60% • GOAL of the week • TS, re-establish physics conditions, alignment of RPs, VdMs • Quench propagation test on RB.A56 • FPA on RQD/F.A67 M.Solfaroli - Technical Stops

  8. TS#2 - Recovery Start of HWC Global CRYO start Lost P8 (communication) First pilot Pilots cycle Preparation for VdM scan CRYO CRYO TS Beam comm Recovery t Thu 12th 2.10pm Thu 12th 6.31pm Fri 13th 08.42am Fri 13th 11am Sat 14th 2.10pm Sat 14th 9pm Sun 14th 9am Mon 9th 7am ~27 h 8% 54% 38% M.Solfaroli - Technical Stops

  9. TS#3 - The longest one 04 - 08 July – 5 days + 1 recovery day 3062 keys given • WHERE WERE WE? • Last 3.5 TeV physics fill (1901): • 1380 b (144 bpinj) • ~1.16 E11 p per bunch • Peak lumi: 1.26E33cm-2 s-1 9% 26% 65% • GOAL of the week • Continue with the satellite collision scheme • (264b and higher) • Quench propagation test on RB.A56 • Test of DQQBS boards in S81 M.Solfaroli - Technical Stops

  10. TS#3 – Recovery Start of HWC Global CRYO start Power cut First pilot End of loss maps Injection CRYO CRYO TS Beam Beam comm Recovery Recovery t Mon 04th 7am Fri 8th 7.19pm Sat 9th 8.05am Sat 9th 5.27pm Sun 10th 11.11am Mon 11th 7.22pm Tue 12th 3.15pm Thu 14th 7am 14.5% 14.5% 71% When the power cut arrived, beam commissioning was almost completed (a TCDQ-TCSG cross check was ongoing) M.Solfaroli - Technical Stops

  11. TS#4 29 August - 02 September – 5 days + 1 recovery day 3645 keys given • WHERE WERE WE? • Last 3.5 TeV physics fill (2040): • 1380 b (144 bpinj) • ~1.29E11 p per bunch • Peak lumi: 2.1E33cm-2 s-1 7% 24% 69% • GOAL of the week • TS, recovery from TS, 1 m beta*, Alice polarity change • Quench propagation test on RQD/F.A56 M.Solfaroli - Technical Stops

  12. TS#4 - Recovery ~3 h without beam from injectors Global CRYO start Start of fill that reached beta* 1m Start of HWC First pilot First pilots ramp CRYO Recovery Beamcomm TS t Mon 29th 7am Fri 2nd 2.10pm Fri 2nd 5.14pm Fri 2nd 10.33pm Sat 3rd 1.41am Sat 3rd 10.59am 7% 7% 86% M.Solfaroli - Technical Stops

  13. TS#5 07 - 11 November – 5 days + 1 recovery day 3404 keys given • WHERE WERE WE? • Last 3.5 TeV physics fill (2267): • 1380 b (144 bpinj) • ~1.5E11 p per bunch • Peak lumi: 3.5E33cm-2 s-1 6% 24% 70% GOAL of the week TS, recovery, ions (stable beams) over the weekend • Quench propagation test on RQD/F.A56 M.Solfaroli - Technical Stops

  14. TS#5 - Recovery Pb commissioning included Global CRYO start Start of HWC First pilot Asynch BD @ 450 GeV Physics conditions SB CRYO Recovery Beam comm TS t Fri 11th 4.58pm Fri 11th 5.48pm Sat 12th 00.13am Sat 12th 00.32am Sat 12th 02.31am Sat 12th 06.40am Mon 7th 7am 5% 6% 89% M.Solfaroli - Technical Stops

  15. Some numbers… Tunnel activities vs TSs M.Solfaroli - Technical Stops

  16. …more… Pretty low statistics to have meaningful conclusions... ...in general HW issues require more time to be fixed M.Solfaroli - Technical Stops

  17. …and more! X = number of days allocated Allocated time for recovery = 24 h Recovery coefficient Recovery time vs TSs M.Solfaroli - Technical Stops

  18. Client requests • Cryo: no systematic maintenance anymore, it would be OK with 4 (or even 3) TSs provideda minimum of 5 days each (this year was good!) • QPS: minimum of 3 stops (ideally in May, August and October). Minimum duration 4 ½ days as in 2011. • EPC: not particular systematic intervention needed, but at least 1-2 days every 9 – 10 weeks • EL: TSs needed to repair/reset/maintain some systems that are not in good shape. Nevertheless, till the machines work… • CV: global time already at the limit. It would be difficult to keep for more than 8-9 weeks • Experiments? (CMS: “we would be ready to go to 4/5d every 10 weeks if needed”) • Injectors? M.Solfaroli - Technical Stops

  19. Conclusions • Need to improve fault details recording • Most of activities is maintenance, can it be reduced? • No systematic source of trouble over the 5 TSs !! • It seems clear that we are improving in recovery… 2012 • (“After TS, an increment in faults was observed. Effect is decreasing along the run” Walter @Chamonix 2011) • Need to apply a control for SW changes (through a meeting to coordinate and create a list?) which could: • Improve changes, by coordinating them • Increase operational efficiency, by making easier the identification of the source of problems • Reduce impact of changes on other systems • 4 TSs foreseen for 2012...can we push forward some maintenance and have 3 TSs of 5 days? M.Solfaroli - Technical Stops

  20. Back-up slides M.Solfaroli - Technical Stops

  21. TS#1 – Issues 1/2 M.Solfaroli - Technical Stops

  22. TS#1 – Issues 2/2 M.Solfaroli - Technical Stops

  23. TS#2 – Issues 1/2 M.Solfaroli - Technical Stops

  24. TS#2 – Issues 2/2 M.Solfaroli - Technical Stops

  25. TS#3 – Issues 1/2 M.Solfaroli - Technical Stops

  26. TS#3 – Issues 2/2 M.Solfaroli - Technical Stops

  27. TS#4 - Issues M.Solfaroli - Technical Stops

  28. TS#5 - Issues M.Solfaroli - Technical Stops

  29. TS#3 - Recovery 2 h SB with 2 bunches done meanwhile Start of HWC Global CRYO start Power cut First pilot End of loss maps Injection CRYO CRYO Beam Beam comm Recovery Recovery TS t Mon 04th Fri 8th 7.19pm Sat 9th 8.05am Sat 9th 5.27pm Sun 10th 11.11am Mon 11th 7.22pm Tue 12th 3.15pm Thu 14th 7am 16% 45% 39% When the power cut arrived, beam commissioning was almost completed (a TCDQ-TCSG cross check was ongoing) M.Solfaroli - Technical Stops

  30. General Overview Smaller emittance Increased n. bunches Increased bunch intensity Beta* = 1m 50 ns 75 ns MD, technical stop MD, technical stop, SQUEEZE MD, technical stop, scrubbing MD, technical stop 28 % of global time = TUNNEL INTERVENTIONS M.Solfaroli - Technical Stops

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