Saturday 25/11/10 & Night 12:24 Dump fill #1523 after more than 8 hours in physics It takes some time to get back:  Parallel sequences: Fewer clicks to.

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Presentation transcript:

Saturday 25/11/10 & Night 12:24 Dump fill #1523 after more than 8 hours in physics It takes some time to get back:  Parallel sequences: Fewer clicks to turn around, always in the same order Ready for injection 50 minutes after dump  14:20 During injection: TI8 magnet problem – EPC piquet  Wait for ATLAS SOLENOID to ramp up – on slow ramp rate…  Trip of power converter RCBCV7.L2B2. ‘Only’ a corrector, but needed….. (see later) Short access PM25, power converter rapidly changed  20:20 Problem on the door of power converter in TI2 RQID_20700 EPC piquet for TI2... unfortunately the CERN car that he has been issued with only summer tires on :30 Injecting for fill #1525  Pauses during filling because of PS cavity trips  23:56 Stable beams ! This time it took 11h32 min to get back in physics again 7:50 Ion source problem – wait with refilling LHC 8:30 meeting 28/11/2010

Fill #1523 Small emittances after filling at injection  B1H/V: 3/2.5, B2H/V: 3.3/3.6 Good start lumi’s, although no record beam intensities 04:00 Stable Beams 12:20 Dump LHC 8:30 meeting 28/11/2010

Power converter RCBCV7.L2B2 Trip of power converter RCBCV7.L2B2. ‘Only’ a corrector, but needed…..this is close to the IP Jorg: There would be two 1 mm bumps after correction and one of these is at the Q5. With such bumps the correction may be difficult and also could have an influence on the crossing angle Decision to do the access and fix the problem rather than creating new ones EPC access is needed to fix it. Due to the snow the earliest that the piquet can get here is ~5:45, so the access starts at about 18:30 MAD guardian got lost (in the snow) – another 30 min delay Power converter RPLB.UJ23.RCBCV7.L2B2 has been changed. Auxiliary power converter fault LHC 8:30 meeting 28/11/2010 Error not corrected out

Midnight: Stable beams fill #1525 LHC 8:30 meeting 28/11/2010

Beam currents and lumi’s since Wednesday LHC 8:30 meeting 28/11/2010 Can spend your time analysing the lumi’s...

(ALICE) Lumi vs. time 28/11/2010 Saturday: Fill # 1523 Friday: Fill # 1522 Fill # 1523 / Fill # 1522 ‘Elbow’ For both fills optimum time to keep it in would be about 5 hours, for 4 hours refill…. Keep it for 6 hours, for an 8 hours refill..... We tend to keep it longer: you know what you have Confirmed by yesterday’s experience

Total delivered lumi, this morning Very close to the target for this week of 6 (µb)-1 LHC 8:30 meeting 28/11/2010

Plan Get beam back again from Linac - refill More physics 121 x 121 Next Week:  Tuesday: Van der Meer Scans  Injection tests with 8 bunches  Discussing a few MD-style studies (IR aperture, …) LHC 8:30 meeting 26/11/2010