Week 6: Machine Coordinators: G. Arduini, E.B. Holzer
|
Date |
Summary |
Link to report from morning meeting |
| Mon 11th February |
- loss maps and asynchronous dump test at injection
|
08:30 meeting |
| Sun 10th February |
- 6:04 OP dump of last Pb-p fill
- preparing for pp run
- 7:00 - 9:30 access: BPMS IP6, BI in IP4, ADT, ATLAS, CMS
- interlock settings of BLM, BPMS and RF reverted to high intensity pp
settings
- ADT and feedback settings reverted to pp (bandwidth, gain, gating)
- ALICE polarity to negative
- 10:00 - 16:00 2 cycles with probes (tune, chroma, orbit)
- 17:00 - 19:00 testing interlock BPMS with orbit bumps
- 19:30 - 20:40 loss maps at injection
- 20:40 - 4:30 cycle with 5 bunches for: collision set-up, collimator
set-up (TCTs and TCLs), vertical RP alignment and data taking, betatron
loss maps in collision and asynchronous dump test (RP at 22 sigma)
|
09:00 meeting |
| Sat 9th February |
- 02:42 STABLE BEAMS #3541
- 07:45 Beam dump BPM LSS6
- 10:40 Stable BEAMS #3542
- Van der Meer scan in LHCb
- 15:00-15:20 Adjust. End of fill #3542. Test for measurment of 50 Hz
noise at top energy
- 18:31 STABLE BEAMS 3543
- ~23:00 Exceeded 30 nb-1 delivered in ALICE/ATLAS/CMS. More
than 3nb-1 in 24 h
|
09:00 meeting |
| Fri 8th Febraury |
- Fill 338 on 338 with ALICE head on and ATLAS/CMS and LHCb at ~1% of
peak luminosity – Synchronization problem with SPS delaying fill by ~0.5
h.
- 02:57 STABLE BEAMS #3538
- 12:58 BPM LSS6 trigger - Wnd of fill 3538
- 14:00 Filing for VdM scan ATLAS/LHCb
- 16:45 STABLE BEAMS #3540
- 18:30 End of VdM scan in ATLAS. LHCb starts
- 18:42 RQX.L8 trip. End of fill #3540. Instrumentation problem on
DFBX.
- 22:27 End of access for RQX.L8
- 23:47 IT.L8 cryo OK
|
08:30 meeting
|
| Thu 7th Febraury |
- 2:25 fill 3534 dumped by BPMS IP6
- 3:19 re-injecting
- 5:24 stable beams fill #3535
- 10:00-10:30 End of fill test: bump scan at the BSRT position
for BSRT calibration. Dump from SIS during the scan
- 10:31 Dump from SIS during the scan. End of fill #3535
- 11:30-13:00: Scraping test for energy calibration error evaluation
- 14:00 filling
- 14:59 Beam dump during cogging: too large momentum offset excursion
for B2 (p) during the process è > 10 BPMs out of tolerance
- 18:17 STABLE BEAMS #3537
- 23:34 BPM Interlock - End of fill #3537
|
08:30 meeting
|
| Wed 6th Febraury |
- Disable the batch by batch longitudinal blow-up at injection. Longer bunches from the SPS?
- 02:36: Large OFB correction at flat-top. Bad BPM was misteriously enabled!!. Beam dump
- Again issues with the quality of the ion beam in the injection.
- 05:20 Ramp. This time with acceptable losses (35 %)
- 06:08 STABLE BEAMS #3533
- 10:04 LSS6 BPM trigger end of fill #3533
- 11:00-12:30 Injection checks and energy matching
- 13:00 lost cryo in S23 --> Access
- 18:00 Cryo OK
-
21:22 STABLE BEAMS #3534
|
08:30 meeting |
| Tue 5th Febraury |
- 00:04 beam dump after cogging by losses 11R7: orbit drift
- 3:12 stable beams fill 3527 (338x338)
- 7:35 dump by BPMS in IP6
- 10:04 Beam dump when switching ON the OFB. Disabled BPM leading to
structure around point 8
- Filling slowed down by QPS communication problems and poor ion beam
quality
- Increased thresholds for BLMs close to 9 and 11.R7.B1 by 50%.
- 13:48 STABLE BEAMS 3529
- 15:57 Trip of Sector 12. (RB.A12 - likely SEU)
- No switch opening of RCD.A12B2: block this circuit until further
investigations
- LHCb polarity positive
- 19:39 start filling. Adjustment of injection frequency to minimize capture losses
- 21:35 PS RF problem during filling
- 22:30 Beam back. Dump and refill
- 23:59 Important capture losses at the beginning of the ramp. Beam dump (BLMs in point 3)
|
08:30 meeting
|
| Mon 4th February |
- 01:00 beam dump" BPM6
- 02:00 new injection, 192x216 bunches
- 03:50 stable beams #3523
- 08:15 End of fill #3523
- 11:14 Stable Beams #3524 with 192x216 bunches and
higher orbit feedback bandwidth (losses at ~20-25% of dump thresoholds)
- 13:20-13:50 test with local bump in dispersion suppressor R7.B1 to
try and spread losses.
- 15:00 End of fill #3524. BPM6
- 18:52 Stable beams #3525 with 338x338 bunches. Losses at ~50% of dump
threshold at beta* of 1 m.
- 21:02 beam dump: trip of RQTL9.R3B2
|
08:30 meeting
Energy
calibration |