Friday to Monday (included) morning meetings at 09:00.
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Day
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Summary
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Link to report from morning meeting
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Tuesday 26th April
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- 04:50 Cryo problem in
point 2. End of fill 1736
- 08:00 Cryo recovered.
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8:30
meeting
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Monday 25th April
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- 12:00 150 pb-1
in 2011
- 13:30: dump fill 1735,
20 pb-1 integrated luminosity.
- 16:20: Stable beams
fill 1736, 480 b/72b per injection. Initial luminosity up to
~4.3x1032 cm-2
s-1 (ATLAS)/~4x1032 cm-2
s-1 (CMS).
- 20:40 Beam dump due to
losses induced by vacuum spike on vacuum gauge close to triplet R8. End of
fill #1736
- 23:45 Stable beams fill
1736, 480 b/72b per injection. Initial luminosity up to
~4.8x1032 cm-2
s-1 (ATLAS)/~4.4x1032 cm-2
s-1 (CMS).
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9:00
meeting
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Sunday 24th April
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- 06:20 Power glitch. End
of fill #1732. Close to 24 pb-1
after ~18 h in physics
- New record
integrated luminosity in one day (UTC time): 25.6 pb-1
- 132 pb-1
delivered so far
- Recovery from power
glitch. Access for QHPS RB.23. 4 collimator to be reset (resolver
positions).
- 13:00-15:00 Loss maps
to injection to check collimators.
- 15:00 Filling 1733, 480
b with 72 b per injection. Slow filling due to 800 MHz problem in the SPS.
- 16:30 Stable beams
1733, dumped after 10 minutes by vacuum spike R8 (sector triplet-Q4 R8).
Hypothesis is that spike is due to out-gassing of the gauges (following the
cryo problem of last week).
- Interlock levels of the
gauges set temporarily to 4E-6.
- 19:30 Filling 480
b with 72 b per injection, drop intensity by 10%.
- 21:00 Stable beam fill
1735, 480 b/72b per injection. Initial luminosity up to
~4.8x1032 cm-2
s-1 (ATLAS)/~4.4x1032 cm-2
s-1 (CMS).
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9:00
meeting
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Saturday 23rd April
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- 07:40 Beam dump.
Integrated luminosity 15 pb-1 in one fill - new LHC record.
- Integrated
luminosity in 2011 > 100 pb-1.
- Important blow-up
during filling due to large drift in chromaticity. Dump and re-fill
- 10:20 Beam 1 kicker not
firing due to missing pre-pulse. Beam (36 bunches) on TDI cleanly
- 12:30 Stable beams
#1732. 480 bunches/beam. Initial luminosity up to
~5.2x1032 cm-2
s-1 (ATLAS)/~4.8x1032 cm-2
s-1 (CMS).
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9:00
meeting
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Friday 22nd April
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- 06:55 Beam dump (LHCb
movement). End of physics #1729 - ~9pb-1 after 7 hours.
- 11:37 Stable beams
#1730 - (336 bunches - trains of 72 bunches) - initial luminosity 3.1x1032
cm-2s-1.
- 16:00 Beam dumped. PC
fault.
- 19:10: Stable beams
fill 1731. 480 bunches/beam. Initial luminosity up to
~4.8x1032 cm-2
s-1 (ATLAS)/~4.5x1032 cm-2
s-1 (CMS).
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9:00
meeting
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Thursday 21st April
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- 07:30: End of fill
#1727. Beam dumped.
ALICE compensator magnet fault. Delivered ~6.7 pb-1 in 7.5 h.
- 11:30 Stable beam
#1728. 480 bunches/beam. Initial luminosity up to
~4.0x1032 cm-2
s-1.
- 20:10 End of physics
#1728 - 9.7 pb-1 in 8.6 h. 15.2 pb-1
in 24 hours
-
23:55 STABLE BEAMS #1729 - 4.8(ATLAS)/4.4(CMS)x1032
cm-2s-1 WORLD RECORD IN
PEAK LUMINOSITY IN A HADRON COLLIDER
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8:30
meeting
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Wednesday 20th April
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- 23:30-03:30 - Recover
and pre-cycle (2 ventilation doors were open)
- 03:20-07:00: Loss maps
in collision (-500 Hz)
- 07:00-13:00: TDI
alignment
- 13:30-15:00: Ramp 336b
with 72b/injection. Beam lost around 3 TeV due to horizontal instability
(dump on BLM @ TCSG IR7).
- 16:00-19:30: No beam.
VIP visit.
- 21:30: Ramp 336b with
72b/injection.
- 00:00: Stable beams,
fill 1727. First time with 72b/train.
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8:30
meeting
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Tuesday 19th April
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- 05:30: Stable beams
fill 1722, L ~3.3E32 cm-2s-1.
- 11:10: Beam dumped. 5.7
pb-1 IR1/5.
- 11:10-23:30 Problem
with cryo in pt8 - PLC
- 12:00-18:00 Accesses in
the machine. Optimization of the 50 ns beam in the injectors. Compensator in
point 2 back in operation.
- 23:30 Cryo OK
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8:30
meeting
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Monday 18th April
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- 00:06 Beams dumped
when injecting third 72b batch for beam 2. Kicker flash-over. Many BLM’s
interlocked, LHCb BCM triggered, several
magnets tripped, vacuum valves closed, cryo lost
in 78 and 81.
- Kicker had a spark
after 1.5 micro-s, while injecting the 72b batch. First 36b part OK,
wrong kick for second 36b part.
- Since then: Recovery. Cryo OK. Vacuum OK. Collimators OK.
- Morning: extended
kicker conditioning.
- 13:00 Beams back in the
LHC.
- 13:00-18:00: TDI
alignment check
- Solenoids on around
MKIs in IR8 and IR2.
- 19:00: Test ramp after
COD RT trim feed-forward for ramp and squeeze.
- Loss map in collisions
with dFrf = +500 Hz.
- 21:15: Filling for
physics, 336 bunches, 36b/inj.
- 22:45: Stable beams
fill 1721, L ~3.1E32 cm-2s-1.
- 00:25: dumped by SIS
interlock, HOM power interlock (communication).
- 01:30: TOTEM beam
interlock. Rack power off.
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8:30
meeting
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