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Technical Stop Summary: August 22 - September 2, 2011

Overview of activities and interventions during the technical stop, including access, safety, cryogenics, beam instrumentation, and machine protection. Detailed feedback on RP surveys, access issues, and LASS & BIS networks. Gratitude to teams for collaboration and support.

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Technical Stop Summary: August 22 - September 2, 2011

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  1. Technical Stop #429th August - 2nd September 2011 Summary Julie Coupard Schedule and Coordination J.Coupard

  2. First feedback • RP surveys • RP teams need more and more time to do the survey  increase the length of RP survey till 10:30 and 12:00 on MON morning • Access • Badge of access  access service @build.55 • Problems with some PAD and/or MAD (ODM asked directly) • Access system // Access authorization • Patrols lost • Door forced @Pt1 and @Pt5 • PAD @Pt4 and @Pt7 • Safety • Pulling of cables @Pt4  no VIC and no cryo lock-out asked • CRYO • Stop of the Compressor @Pt8 THU afternoon but cryo conditions recovered on FRI afternoon • Closing of the LHC machine on FRI 16:30 J.Coupard

  3. Interventions pointed out before the TS • Cryogenics • DoneIntervention on oil pipes @Pt6 on surface • Cabling • DoneBLM @Pt3 • DoneNG18 replacement @Pt3 • DoneThermo-switch@Pt1&2 • DoneMonitoring cryo@Pt4 • Beam Instrumentation • DoneBLM: Direct beam dump connection to dump system • DoneBPM: New firmware and SW to increase IIR filterorder • Kickers • DoneChange of generator pos K @Pt6 • DoneChange of generator HV switch @Pt2 • Machine Protection • Done Adjustment of 600 A Energy Extraction Switches • DoneQuench Propagation Tests in the sector 56 J.Coupard

  4. Change of the optical fibers • Intervention on MON • Inhibition of the BIW  locking-out of the injection lines Ti2 and Ti8 (coordination with the DSO) • No patrol dropped • LASS – GS/ASE feedback • a very positive exercise for our team and a rare opportunity of testing a degraded network mode of operation: • The LASS network loop connecting the PLCs works as designed - it can withstand a single network failure without consequences for operation; the associated diagnostics functions correctly. • If possible, using the exact cable/fiber identifiers in the initial presentation of an intervention scope would be beneficial for a more precise estimation of the intervention’s impact. • The LASS loop and the BIS fibers today share the same cable between UJ76 and RE78. • BIS – TE/MPE feedback • The attenuation values for the new fibers were a little bit higher than the previous ones (when they have been initially installed); however, within the standard limits. • The additional measurements done, in order to know the new noise margins, validated again the values • Some additional tests have been performed in setting the LHC Beam Permit Loops in test mode. Everything was fine J.Coupard

  5. MANY THANKS TO.. .. EN/EL and GS/ASE for their fast reactivity and flexibility to identify and solve the problem on the optical fibers .. All groups and Experiments for their collaborations Thanks for your attention J.Coupard

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