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Date
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Summary
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Link to report from morning meeting
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Monday 7 May
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- 00:00 Stable
beam fill 2592, 1092 b, 3.2E33 cm-s-1
- 01:15 Dump by FMCM,
electrical network glitch.
- Refill, but with higher
bunch charge ~ 1.4E11.
- 04:30 Beam dumped in
the squeeze, losses on Q4.L6.
- Yet again… 1092b.
- Survived the squeeze by
miracle – 94% of dump threshold on Q4.L6
- 06:40 Stable beams fill
2592, 1092b, 3E33 cm-s-1
- 11:14 Beam dump. FMCM
another electrical network glitch
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8:30
meeting
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Sunday
6 May
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- Waiting for cryo S78 to
recover.
- 09:00 Precyling.
- 10:00 Filling 1380b - slowed
down by LINAC2 instability.
- Large vacuum activity
in IR2 during ramp and squeeze.
- 12:30 Beam dumped with
1380b a few second before end of collision BP. Losses on Q4.L6 leaking from
7 to 6 on B2.
- 14:00 Filling for 852b.
- 15:40 Stable
beams fill 2590, 852b, 1.3E11 p/b. L ~ 2.6E33 cm-2s-1.
- 19:10 Beam dump, trip
of RQTL11,L5B1.
- At injection TDI in bad
position, cycling and cycling and cycling the TDI...
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9:00 meeting
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Saturday
5 May
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- 00:00 Cryo Pt 8 back.
Precycle.
- 01:30 Lost again cryo
for S78, glitch on valve.
- Problems to restart
compressor due to a problem with a heater PS.
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9:00 meeting
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Friday 4 May
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- 3:44 preventive dump by
operator, as cryo compressor for 81 was lost.
- Access for cryo,
experiments, level of sand in FTDP19 PM32, EPC, BLMD in 4R5, visual control
of cooled cables in IP2, IP4, IP6 and IP8
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8:30 meeting
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Thursday 3 May
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- 02:20 Beam dumped, RF
interlock B2.
- 04:40 Ramp start..
- 05:15 Stable
beams fill 2584, 852b, L ~2.7E33 cm-2s-1.
- 06:00 Beam dump -
triplet L8 trip.
- Lost cryo - recovering.
- Access in TI2 for WIC,
in IR8 for triplet (QPS), in IR6 for BPM attenuator (interlock BPM).
- 14:30 Injecting. IR6
BPM interlock test.
- ~18:00 start filling
for physics
- 20:33 - 3:44 Stable
beams fill 2587, 852b, L ~3E33 cm-2s-1. Integrated luminosity 53/55
pb-1 Atlas/CMS
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8:30 meeting
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Wednesday 2 May
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- 03:30 Refill for 480b
fill. Some issues at injection with IR6 interlock BPMs.
- 08:00 Stable
beams fill 2580, 480b.CMS in low pileup configuration (20% of peak
lumi).
- 14:53 beams dumped by
operator.
- LHCb polarity back to
positive.
- next fill 840 bunches
(plus 12b train non-colliding), ADT gain reduced for the colliding 12b train
and increased for all other bunches.
- 17:30 Beam dumped
during filling. Losses at injection.
- Access in PSB, then
problem in SPS with TI2 PC and with vacuum valves in BA2.
- 20:00 Injecting, TL
steering.
- 21:45 Ramp 852b, 1.3E11
p/b.
- Rocky squeeze and
collisions, losses to 60% of dump thresholds on TCLA.B2 in IR7.
- 22:30 Stable
beams fill 2583, 852b, L ~2.7E33 cm-2s-1, 1.3E11 p/b.
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8:30 meeting
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Tuesday 1 May
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- 05:30 Stable beams,
preparing for length scale calibration.
- 06:03 Site wide
electrical glitch - 400 kV. Lost ATLAS, ALICE, LHCb, all PCs, cold
compressor in Pt2.
- Morning: cryo recovery.
- 10:00 Cryo Pt2 is back.
Some circuits with problems left over.
- 10:15 Lost again cold
compressor in Pt2 during switch on of compensator in Pt2.
- 13:30 Cryo recover in
record time...cycling.
- 15:00 MKI8
synchronization.
- 16:30 Waiting for 50 ns
beam from PS - RF problem.
- 19:00 Filling 84+4b.
- 20:15 Stable beams fill
2576, 84+4b - length scale calibration CMS and ATLAS.
- 02:30 Beam dump by
operator.
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9:00 meeting
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Monday 30 April
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- BPM interlocks IR6.
- Full cycle with
2b/beam. LHCb optimization with PC pol -. TCT alignment check.
- 12:00 Exchange of BLM
card. Problems with serial number (DB update).
- 16:30 Injection, TDI
setup
- 20:30 RF cavity phasing
B1.
- 23:00-00:00 Loss maps
on FT.
- Injection delayed.
Problems with DB (mode change).
- 03:00 Filling for 84+4b
fill.
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8:30 meeting
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