|
Date
|
Summary
|
Link to report from morning meeting
|
|
Monday
28 May
|
-
1:13 - 2:27 stable beams Fill 2670, 1.5e11 average
bunch intensity, Peak lumi: 6.6e33 cm-2s-1, Integrated lumi ~ 27 pb-1,
Emittance in collision ~ 2.2 μm rad
-
2:27 Fill 2670 dumped by power converter problem of RQTX2.L8 (Free wheel
diode fault)
-
5:33 stable beams Fill 2671, 1.5e11 average bunch intensity, Peak lumi:
6.4e33 cm-2s-1, Emittance in collision ~ 2.3 μm rad
|
9:00
meeting
|
|
Sunday
27 May
|
-
Cryo recovery Pt 8
-
22:00 cryo recovered
-
22:42 – 23:14 problem with RF module 2B2
-
23:14 injecting
|
9:00 meeting
|
|
Saturday
26 May
|
- 0:50
Dry dump to verify LBDS
- 3:21
Fill 2668 dumped by losses at TCLA.C6R7.B1 at the very beginning of
collisions BP (bunch intensity a bit too high? average 1.53e11)
- cavity
7B2 low level problem
- 6:24
Fill 2669 stable beams, average bunch intensity 1.5e11, peak lumi:
~6.5e33 cm-2s-1.
- 14:37
Beams dumped by operation due to cryo problem:
Refrigeration unit (QURC) down in point 8. Integrated lumi: 132 pb-1.
- 16:28
Access to US85 to reset the magnetic axle bearing of QURCB.
- 17:20
ALICE access (dipole and compensator had been ramped down before).
- 22:08
End of ALICE access.
- Pressure
rise in the triplet zone 7.4L1.X (no pump in the segment and triplet
warming up).
- Cryo recovery ongoing.
|
9:00 meeting
|
|
Friday
25 May
|
- 1:06 Fill 2662 dumped
in adjust, high beam losses (bunches at the end of trains), average
bunch intensity 1.55e11.
- 3:44 – 15:04 stable
beams Fill 2663, 1.51e11 average bunch intensity, Peak lumi:
6.5e33 cm-2s-1, Integrated lumi 167 pb-1
- 14:30
– 15:00 tune scan B2
- 15:04
beam dumped for scheduled access: Atlas gas leak; LHCb; Pt 6 interlock
BPMS cabling check and attenuators; Vacuum Pt 4 to repair a pumping
group at 14R4; TOTEM LVDT bypass activated and B2 injection BIC channel
disabled.
- BBQ,
OFSU, LBDS and MKI problems
- RQ6.R1
tripped due to a spike in U_res
|
8:30 meeting
|
|
Thursday
24 May
|
- 00:41 Dumped by
interlocked BPM in IR6.
- 01:22 Problems with
TCL.5R1.B1 (recurrent issue). Disabled the resolver check on lost steps.
- 02:11 Injection.
- 03:53 Stable beams.
Peak lumi: 6.0e33.
- 05:14 RB.A45 QPS trip.
Recovery…
- 09:00 Access for IR8
triplet. Other accesses in shadow.
- 14:40
BPM interlock test
- 17:34
Fill 2660 stable beams (no more 'private' IP8 bunches), 1.48e11 average
bunch intensity, peak lumi 6.1e33 cm-2s-1, integrated lumi 24.5 pb-1
- 18:47
beam dumed by SIS BLM HV interlock (communication problem between BLM
CPU and CMW).
- Access
for Atlas gas leak
|
8:30 meeting
|
|
Wednesday
23 May
|
- 04:24 Operator beam
dump.
- Refill
for physics. Delays due to problems with SPS bunch length.
- 08:55
Fill 2653 stable beams, 1.40e11 ppb, 5.6 1033 cm-2s-1peak
lumi, 11.6 pb-1 total lumi delivered.
- 09:31
Dumped by collimator interlock on TCDD (injection movable
mask/collimator) for beam 1.
- 10:55
Access for replacement of power supply for PXI rack.
- 11:41
Access finished. Recovering TCDD and TDI positions for beam 1. In
shadow: QPS board swap on RQTL11.L5B1 and RCD.A45B1.
- 13:02
Injection. Steering TI2 and TI8,
- 14:05
problems with BPM interlocks from LSS4 and LSS6. PS and SPS need to
readjust the beam.
- 14:15
TOTEM interlock for injection.
- 17:36
Injecting slightly higher bunch intensities: 1.47e11 average. Emittance from SPS: ~1.8 micron (on 12 b).
- 18:41
Stable beams. Peak lumi: 5.6e33.
|
8:30 meeting
|
|
Tuesday
22 May
|
- 00:42 Collimator
issues: RBAC access problem.
- 01:09 FBCT issue:
reboot.
- 01:27 Interlock from
TCL.5R1.B1: missing steps.
- 02:49 Again FBCT
issue: reboot.
- 03:05 Injection
- 04:03 Interlock from
TCL.5R1.B1.
- 06:19 Injection.
- 08:09 Ramp.
- 08:48 stable beams
fill 2651. Peak Luminosity: 5.8 1033 cm-2s-1.
|
8:30 meeting
|
|
Monday
21 May
|
- Access for switching
temperature probe DFB L7.
- In shadow: Access for
fire detection equipment at point 1. ATLAS access.
- 12:26 Injection.
Interlock from TCL.5R1.L1: lost steps.
- 13:41 Stable beams.
5.9e33 lumi. 123MJ. Low losses in intensity.
- 20:59 End of fill. Trip
of IT.R1. Validation of inner triplet in R1 needed due to spurious
signals in PM. ATLAS intervention.
- 23:33 Triplet check
complete. Signals are normal and observed spike is due to a slight
current imbalance between the Q1 and the Q3 of the triplet. Proceed.
|
8:30
meeting
|