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Saturday 2 nd October

Following MPP approval, Bernd Dehning has increased the BLM thresholds by a factor of 3 for the arc DS. The last UFO was triggered by BLMs with the low thresholds. Updates on LHC status for Saturday, October 2nd.

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Saturday 2 nd October

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  1. Saturday 2nd October • BLM threshold follow-up - Bernd Dehning and JoergWenninger • Following MPP approval, Bernd Dehning has increased the BLM thresholds by a factor 3 for arc + DS. • The last UFO (not very strong) was on Q5.R2 and was triggered by BLMs of the family with the low thresholds. • After yesterday morning beam dump, Bernd applied the same factor 3 to the LSS quadrupoles with the exception of the triplets, the warm elements (like TCTs), and the quadrupoles that already have special thresholds near the injection regions. LHC status

  2. Saturday 2nd October • Morning – VerenaKain and LasseNormann: • 9:00 : Inject 152b x 152 b : very smooth injection process • Ramp • Squeeze • 10:56 : Stable beams # 1388: B1 H 2.21 V 2.07 B2H 2.59 V 2.80 um LHC status

  3. Saturday 2nd October V. Kain LHC status

  4. Saturday 2nd October LHC status • Some LHCb separation tests done : no effects on CMS and ATLAS seen

  5. Saturday 2nd October • 10:56 – 13:09 : Stable beams - ~2h15 – Beams dump by an apparent communication problem of QPS (trip of sector 56). ~360 nb-1 (ATLAS) accumulated. • 13:09 – 23:56 : Investigation - access and repair on going. MirkoPojer’s summary: Access by QPS and CO piquet: it turned out to be a problem of a computer (the one controlling the Mains global bus bar detector) whose power supply burned, producing the opening of the circuit breaker of the whole rack, where also the WorldFIP is contained. After replacement of the PS on his office, Gert went back to the tunnel and re-installed the computer. While cleaning all circuits that had been affected by the COMM lost, we had to carry out many power-cycles, both software and hardware. Unfortunately, we realized that one QPS controller with its four circuits (RCDs and RCSs) was not behaving correctly; investigations showed that the communication board was dead. Gert went back to his office to look for a new one and reprogrammed it. And back to point 6 to re-install the board. LHC status

  6. Saturday 2nd October to Sunday 3rd October • Midnight – 03:25 : Recovering the machine conditions for injection (trips, BETS) and setting up with pilots • 03:25 – 08:30 : PC for the Main circuits in the SPS tripped and could not be reset. The piquet was called but for remainder of the shift there was no beam from the SPS • 8:30 : LHC in injection for Physics fill • TODAY • …. Same a yesterday : get that last 152bx152b in the machine for a LONG physics fill… LHC status

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