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Tuesday 3 rd May

Tuesday 3 rd May. 04/05/2011. 7:30 Access in the SPS to replace injection kicker magnet terminating resistor after radiation cool down overnight 9:45 probes injected in the LHC but some SPS problems 11:45 Filling for physics fill #1756 13:45 Stable beams

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Tuesday 3 rd May

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  1. Tuesday 3rd May 04/05/2011 • 7:30 Access in the SPS to replace injection kicker magnet terminating resistor after radiation cool down overnight • 9:45 probes injected in the LHC but some SPS problems • 11:45 Filling for physics fill #1756 • 13:45 Stable beams • 14:03 Beam dumped due to Uninterruptable Power Supply (UPS) problem point 5 (EBS 11/56) • UPS problem point 5 • 20:15 External company on site to fix faulty UPS • Smoke alarm due to UPS fault and search lost • Presently waiting for additional, external UPS experts to arrive LHC 8:30 meeting

  2. Fill #1756 Bunch sizes before dump: • Injection not very clean, oscillations and losses in the transfer line • Some bunches vertically blown up (see below) • Lumi’s around 730 Hz/ub • Max values Atlas 725, CMS 730 Hz/ub • Atlas corrected published lumi downwards, now agrees with CMS • Only lasted 18 minutes – dump UPS LHC 8:30 meeting

  3. UPS broken in UJ56 • Fault at 14:03 • Decided not to continue while shunting out with other UPS • External company required • 20:15 External piquet on site • Tried elements from UPS in IP4 to fix broken UPS IP5 • 04:00.... Did not work • Waiting for more experts to arrive at 9 am • More news asap LHC 8:30 meeting

  4. Plan • 6:00 Start of MD period • Until Monday morning, when the TS will start • First MD of Werner cancelled • Will pick up the MD program with a working machine as soon as possible LHC 8:30 meeting

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