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Friday 2 nd November 08:45 Stable beams Fill 3253 Initial luminosity ~7.3e33 cm-2s-1 09:45 Increase RF voltage from 10 MV to 12 MV 12:00 ADT to wideband.

Published byRodney Harold Carroll Modified over 8 years ago

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Presentation on theme: "Friday 2 nd November 08:45 Stable beams Fill 3253 Initial luminosity ~7.3e33 cm-2s-1 09:45 Increase RF voltage from 10 MV to 12 MV 12:00 ADT to wideband."— Presentation transcript:

1 Friday 2 nd November 08:45 Stable beams Fill 3253 Initial luminosity ~7.3e33 cm-2s-1 09:45 Increase RF voltage from 10 MV to 12 MV 12:00 ADT to wideband settings 12:38 Beams dumped, lost BLM crate L8. 79 pb-1 in 3h53m BLM card change and BLM CPU change. Access BBQ and ATLAS. 17:48 Start pre-cycle 19:30 Transfer line steering 20:29 Beams dumped on last injection B2, LHCb BCM 22:09 Filling for physics 23:39 Fill #3259. Stable Beams. Initial lumi 6.5e33 cm-2s-1 09:04 Beams dumped: Sector 67 trip, RB.A67 ST_ABORT_PIC. Integrated lumi 143 pb-1. LHC 8:30 meeting 3/11/2012

2 RF voltage up from 10 to 12 MV in fill LHC 8:30 meeting 3/11/2012 BSRT, no significant effect ALFA, sees an effect

3 Lumi after Vrf and ADT bandwitdth LHC 8:30 meeting 3/11/2012 Good for the lumi to increase to RF voltage ADT wideband settings still a (small) negative effect on lumi lifetime

4 BLM point 8 (Christos) The FEC on crate SR8.L has become unreachable twice with one hour difference in between. During the investigation it was noticed that one card has shown unreal temperature values in the last hours (see attached plot of the temperature of all the cards reported). The card was decided to be exchanged as a precautionary measure. It is not sure if the crate crashes are related. The CPU of SR8.L became unresponsive for a third time (after the exchange of the card in suspision) and therefore decided to also replace it. LHC 8:30 meeting 3/11/2012

5 Transfer line steering B2 horizontal oscillations Injection looked quite good for these days Last injection: Dump triggered by LHCb BCM upon injection of 144 bunches  In the past this was related to large satellite population... Injected the following fill without further steering LHC 8:30 meeting 3/11/2012

6 Fill #3259 23:39 Stable Beams. Initial lumi 6.5e33 cm-2s-1  Also indicates we don’t have perfect beam in the machine  Might be related to injection problems LDM in physics – satellites at +/- 25 ns larger B2: OK. ALICE lumi max about 8 – not that large. B1 B2 Called Anna for missing BSRT image: got it back Vertical tune B1 trimmed down by 3e-3 at the end of the squeeze thereby introducing a tune split. Presently produced about 140 pb-1 in 9 hours LHC 8:30 meeting 3/11/2012  0.7 %

7 Outstanding Urgent access ALICE, 4h Improve on injection oscillations and losses, especially B2 Move in TOTEM and/or ALFA at end of fill  ALFA: Saturday or Sunday daytime, with TCLs in or out.  TOTEM: possible time slot Sunday afternoon, only with TCLs out LHC 8:30 meeting 3/11/2012

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