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Day
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Summary
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Link to report from morning meeting
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Mon 19th September
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- 01:44 – Stable beams.
Fill #2124.
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8:30
meeting
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Sun 18th September
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- 08:30 – Cryo
conditions recovered
- Pre-cycle.
- 10:00 – 11:00 Trip
of RF module 2 B2 due to trip of a ion pump (twice) + no 50 ns beam from
PS due to RF problem.
- 13:00 – 15:15
Access in point 4 for replacement of ion pump power supply and World FIP
repeater power supply (affecting cryogenics)
- 16:32 –
Injection. Large injection oscillations again for beam 1.
- 17:33 – Ion
vacuum pump tripped again. RF module M2B2 as well as a consequence.
- Ion pump found OK by
vacuum specialists. Access from vacuum controls to search for
cable/connector/rack issue. Found broken HV link à
Fixed.
- 22:00 – Start recovery
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9:00 meeting
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Sat 17th September
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- 03:28 – Beam
dump due to temperature interlock on collimator TCP.B6.B1. Collected 75
pb-1 in 8h50.
- 04:55 –
Injection
- 06:31 – Ramp
- 06:57 – Beam dump
at flat top. Lost cryo in point 4 (PLC fault and FIP problem). Stopped
cold compressor.
- Recovery and accesses
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9:00
meeting
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Fri 16th September
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- 02:15 trip of Sector
78 – due to sudden jump of U_MAG signal on nQPS DQAMGS.RB.A78.B9L8
(SEU?). End of physics #2110. 57 pb-1 in 6.5 h.
- 04:02 second trip of
Sector 78 during pre-cycle ==> power-cycle DQAMGS.RB.A78.B9L8
- 06:00 – Ongoing
injection problems on beam 2
- 07:42 – Start of
injection investigations
- 11:11 –
Injection problem fixed. Resteering of transfer line. Change due to
perturbations from ion cycle?
- 11:42 – Start of
checks for injection collimators
- 12:09 –
Switching polarity of LHCb dipole and compensators
- 14:45 – 30min stop
of beam from injectors due to restoring of second control system for SPS
compensators
- 16:41 – End of
checks for injection collimators
- 16:58 –
Injection for physics. Losses fine now.
- 17:54 – Start of
ramp
- 18:13 – Start of
squeeze
- 18:38 – Stable
beams. Fill #2117.
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8:30 meeting
Network issues on 15/9
(P. Charrue)
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Thu 15th September
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- 01:09 Controls network
problem affecting PS/SPS/LHC
- 09:30 Controls
network problem fixed
- 10:00 Precycle and
prepare for injection
- 11:30-13:00 LSS6 BPM
interlock after modification of the BPM control card (aimed at fixing a
long lasting problem on a bunch counting)
- 13:00-14:00 Poor beam quality
from the injectors due to a controls problem on a quadrupole of the PS
to SPS transfer line
- 14:00 - 15:00
Re-steering of the TI2/TI8 injection lines.
- Beta* limits on new
TCT functions (before physics) implemented
- 16:30 finally machine
full. Ramping with ~1.38x1011 p/bunch.
- 16:55 trip of
RQTF.A34B2 during the squeeze to 1.5 m ==> beam dump.
- 19:56 STABLE BEAMS
#2110. Initial luminosity >3.3x1033 cm-2s-1.
1.39x1011 p/bunch. >107 MJ at flat-top.
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8:30
meeting
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Wed 14th September
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- 02:39 STABLE BEAMS
#2105. Initial luminosity >3.2x1033 cm-2s-1
in both high luminosity experiments. 1.36x1011 p/bunch.
- 19:10 Operator dump.
End of physics #2105: ~117 pb-1 in
16.5 hours
- 19h47: RQT12.R1B1 tripped
during rampdown.
- 20h16: Access for QPS
& ALICE
- 24:00 End of QPS
access for RB.A1 and RQT12.R1B1
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8:30 meeting
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Tue 13th September
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- 00:56 STABLE BEAMS
#2103. Initial Luminosity >3.1x1033 cm-2
s-1 on both high luminosity experiments (1.31x1011
p/bunch)
- 09:08 Lost patrol in
point 4. Beams dumped. End of fill #2103. ~70 pb-1 in 8
hours. Doors that caused the loss of patrol was not well closed!
- 11:30 End of patrol in
point 4. In the shadow access to ALICE and ATLAS.
- 12:30-14:30 TDI
controls problem
- 14:30-16:00: Damage to
18 kV cable (between BA2 and Meyrin) during the work for the replacement
of the SPS 18 kV cables ==> Electrical network re-configuration. Wait
at injection with pilot bunch during intervention. ATLAS detector
switched off for precaution.
- 17:45 STABLE BEAMS
#2104. Initial Luminosity >3.1x1033 cm-2
s-1 on both high luminosity experiments (1.31x1011
p/bunch)
- 21:05 Lost of Cryo
Maintain in matching Section R5. Wrong temperature reading on the
current lead of RQ6.R5 (SEU). ~32 pb-1 in 3.3 h
- 23:30-01:00 No beam
from SPS (RF low level problem)
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8:30
meeting
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Mon 12th September
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- 04:00 Cryo S12
recovered.
- Precyle, prepare for
injection.
- 09:00-11:00 Injection
checks
- 13:15 STABLE BEAMS
#2101. Initial Luminosity >3x1033 cm-2
s-1 on both high luminosity experiments (1.31x1011
p/bunch)
- 16:39 Beam dump: bad
reading on cryogenics current lead temperature sensor in Sector 56
(RB.A56) - possible SEU. End of Fill #2101. 32 pb-1 in 3
hours.
- 20:00-23:00 collimator
control problem (possible SEU)
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8:30 meeting
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