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Summary Session 2: Availability

Summary Session 2: Availability. Mirko Pojer, Jan Uythoven. Thanks to the speakers for their excellent talks!. QPS – Analysis of main problems, areas to target, possible improvements Reiner Denz Cryogenics, Availability achieved in 2011 and perspectives for 2012 Serge Claudet

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Summary Session 2: Availability

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  1. Summary Session 2: Availability Mirko Pojer, Jan Uythoven Thanks to the speakers for their excellent talks! • QPS – Analysis of main problems, areas to target, possible improvements • Reiner Denz • Cryogenics, Availability achieved in 2011 and perspectives for 2012 • Serge Claudet • Technical Stops: what were the issues in 2011, minimizing impact and improving recovery • Matteo Solfaroli Camillocci • R2E – Experience and outlook for 2012 • Giovanni Spiezia Availability, Mirko Pojer, Jan Uythoven

  2. Quench Protection System • QPS - 2011 • 54 faults requiring intervention • 190 faults radiation induced • The observed faults never caused a total loss of protection ! • Number of faults close to maximum admissible (R.Denz) • QPS 2012 • Consolidation measures over Xmas TS will not lead to zero radiation induced trips, but allow to limit the number of faults despite increasing luminosity • Tune Feedback -> MQT, QPS limits can be increased for 2012, running at 4 TeV, ECR in preparation Availability, Mirko Pojer, Jan Uythoven

  3. Cryogenics Availability, Mirko Pojer, Jan Uythoven • Serge explained to us how to standardize statistics • “ Every single drop of Cryo Maintain is logged, with other categories like duration, situation when lost (beams, Powering, …), origin of failure, …” • Provided a good availability of 89.7 % over 2011 despite serious “discoveries” • 210 hrs of cryo stop related to R2E. 19 SEUs ‘saved’. • Tuned away beam induced effect on cryo regulation • Helped by avoiding dip in bunch length during ramp • Improved strategy on spare components with test bench • Consider 95 % availability reachable for running in 2012

  4. Technical Stops Availability, Mirko Pojer, Jan Uythoven • No systematic source of trouble over the 5 TSs • About 50 % of time spent for recovery from TS related to works done during the TS • 2/3 related to hardware, 1/3 to software • Clearly improving recovery during the year • From 43 h to 13 h • Can do even better by • Control for Software changes: CO and Equipment Groups • List of work/changes to be taken into account by operating crew • 4 TS foreseen for 2012. Can we push to 3 TS of 5 days? • NO

  5. Radiation to Electronics Availability, Mirko Pojer, Jan Uythoven • 2011 saw about 70 radiation linked dump events • Predicted 100 in Chamonix 2011 • Operation scaling for 2012 • Expect more SEUs due to increased total lumi • Beam gas can give up to 100 x more SEU • Important for 25 ns operation, to be better understood! • For 2012 more mitigation actions • UJ14/16 shielding and relocation • US85 relocations • Collimation power supply redundancy etc. • Power converters Digital Filter improvement • 2012 Expect 30 – 50 dump events • Including 60 % mitigation • Suggest additional RadMon coverage for ion operation

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