LHC Status Fri Morning 3-June

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Presentation transcript:

LHC Status Fri Morning 3-June Bernhard Holzer, Ralph Assmann et al Tentative Planning Luminosity Goal: Produce > 250 pb-1 in one week (- 9 min)

Wed Night / Thu Morning 00:31h BEAM MODE > Injection Probe Beam 2. June Wed Night / Thu Morning 00:31h BEAM MODE > Injection Probe Beam 02:03h BEAM MODE changed to STABLE BEAMS, Luminosity 15 hours run

Thu morning 05:00h Emittances during the fill ... comme il faut ! 2. June Thu morning 05:00h Emittances during the fill ... comme il faut !

2. June Thu Morning 06:52h UFO at ~50%!

Thu Morning 10:04h Bunch length observations: Blow-Up during ramp: 2. June 10:04h Bunch length observations: Blow-Up during ramp: end-up with 1.12 ns B1 and 1.15 ns B2 Bunch lengthening during Physics: ~8 ps/hour OK 1.2 ns 1.15 ns

Thu Morning For the fun of it ... 15:00 h Shift Summary 2. June For the fun of it ... 15:00 h Shift Summary Did few orbit corrections (mostly to follow the tides) and lumi scans.

Thu Late 17:00 h integrated Luminosity in this run: 46 pb -1 2. June Shift Summary: Dumped fill 1837 after about 15 h of stable beams......and should not have dumped it.

Thu Late 17:50 h INJECTION PHYSICS BEAM 2. June 17:50 h INJECTION PHYSICS BEAM ... a bit problematic this time bad orbit in the LHC find negative chroma at start injection. 2mm --- -2mm ---

Thu Late 2. June 18:50 h We lost all of a sudden lots on a couple of bunches... dump & refill 19:50 h ...we are again blown up - beam 2 V beam 2 h beam 1 h beam 1 v beam 2 v dump & refill

Thu Late 21:06 h new injection, ramp, squeeze, 21:40 h luminosity 2. June 21:06 h new injection, ramp, squeeze, 21:40 h luminosity bunch emittances ok now 21:46 h Dump: LHCb triggered. We detected a UFO in the triplet before the dump time. Length of lumi fill = 4 minutes

Thu Night 23:06 h new injection, ramp, squeeze, ... 2.-3. June 23:06 h new injection, ramp, squeeze, ... 00:28 h QPS trigger RQTF.A23B2, dump could it be a problem of u_RES passing the threshold. To be confirmed... 01:17 h ...no beam from booster 04:05 h new injection nicely distributed bunch intensities 05:55 h lumi

Thu Night / Fri Morning last 24 hours: 2-3.. June Beam size evolution (as given by BSRT w/o correction) last 24 hours: scheduled dump dump: ufo lumi beam losses at injection dump: qps