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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 2nd April |
- 06:00 Dump qualification test at 2 TeV
- 08:00 Access to prepare for stable beams
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8:30 meeting |
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Sunday 1st April |
- Refill with 2 nominal bunches per beam.
- 03:20 Setting up collisions. Problems in CMS due to previous
incorporation of corrections.
- 06:15 Collisions found in IR5. Start of RP alignment for
TOTEM and ALFA.
- 11:00 Beam dumped with octupole trim.
- 12:00 Injection and dump at 450 GeV.
- 20:00 BI shift
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9:00 meeting |
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Saturday 31th March |
- 03:00 Loss map betatron and -500 Hz off-momentum at 4 TeV
unsqueezed.
- 04:00 Un-squeeze to 500m and 1km beta* (dry run) - OK.
- 06:00 Asynchronous beam dump test at 4 TeV unsqueezed.
- 07:00 Loss maps at injection (with injection protection in).
- 11:00 Check of TCSG6 alignment and loss maps.
- 17:00 Ramp and squeeze for TCT alignment at the end of
the squeeze.
- 22:00 End of TCT setup at end of squeeze.
- Moving to collisions for RP alignment.
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9:00 meeting |
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Friday 30th March |
- 02:00 End of injection.dump work.
- 04:00 Optics checks at 0.6 m.
- 10:30 End of optics corrections and measurements. MPS tests
on each beam at 4 TeV: switch off PC on MSD at 4 TeV with probe
- FMCMs trigger.
- 13:00 Ramp 4 bunches for RF blowup 'study'. Ramp OK.
- 14:45 Ramp 2 bunches for blowup check - OK. Carry on to
collisions.
- 17:40 Colliding for the first time at 4 TeV with nominal
bunches.
- 18:30 All IPs optimized.
- 20:00 TCT alignment in collision.
- 23:00 TCT & TCLP aligned.
- Loss maps in collision.
|
8:30 meeting |
|
Thursday 29th March |
- 05:39 Injection for collimation setup at 4 TeV (2 nominal
bunches, increased emittance)
- 06:19 Ramp
- 06:49 Start collimation setup at 4 TeV. Still RF blowup
issues.
- 15:00 Collimator setup at 4 TeV completed. Betatron loss
map, dp/p loss map +500 Hz.
- 17:00 Electrical perturbation, some circuits off.
- 19:00 Injection and dump work.
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8:30 meeting |
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Wednesday 28th March |
- 05:40 Lost S78 - QPS controller.
- Access for QPS and RB.A78.
- 09:30 Precycle. RQ6.L7 tripped during
precycle.
- 10:39 QPS experts have reset RQ6.L7B.
The trip was due to a zero-crossing voltage spike of PC.
Spike was exceeding the filter capacity of the detection system,
which in consequence tripped the circuit.
- 11:08 FBCT ... both crates
rebooted by the experts.
- 11:50 OFC down.
- 12:57 Still connection problems with OFSU
between OFSU and connected devices. Fixed ramp functions for
TCT's in IR8.
- 13:06 Start ramp with 2 nominal bunches per
beam. RF blow-up on. Transverse emittance large, as requested
(4.5 micron norm.).
- 13:43 Start of 4 TeV collimation alignment.
- 15:53 Beams dumped due to beam loss, induced
by longitudinal beam instability (phase loop with zero gain) and
a small orbit correction.
- 16:23 Cavity 3B1 tripped. Calling expert. Dry
ramp for the RF with the blow-up
- 16:57 Injection.
- 18:32 Ramp of two nominal bunches.
- 19:00 Some BI studies at flat top: tune
tracking tests, switched on radial modulation and trimmed
Q' in steps between -15 (not so good, see
life-time) and +15 (much better).
Actually,
Q'=-10 seems to be also OK.
- 19:49 Programmed dump. Test unsqueeze to 90m:
no interlock!
- 21:50 Injection.
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8:30
meeting
Access problem Pt8 |
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Tuesday 27th March |
- 06:40 Pilot bunch through full cycle.
- 09:10 Shielding wall in point 8 seen as open (same as Saturday). Beams dumped. Access and
repair required. Patrol afterwards.
- 18:00 Beam finally back.
- TCDQ angular alignment.
- Preparation of TCDI validation.
- 23:00 Test ramp & squeeze started, lost on
400V problem in UA63/67.
- 03:30 Beam back, probe through ramp and
squeeze. Lost all beam in squeeze on IR8 TCTs.
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8:30 meeting |
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Monday 26th March
|
- 1:00 ADT set-up.
- 2:00 BGI test B1 4 nominal bunches
- 3:30 - 8:00 b* measurement with K-modulation at 0.6m
- 8:00 lost cryo.compressor
in p2.
- 11:00 Cryo is back -
access ongoing...
- 13:00 Machine closed.
Pre-cycle.
- 14:30 Injecting...
Problems with communication to PCs leading to beam dumps. Cleaning up rogue
clients solves the problem. Investigating orbit- & energy-FB issue, and
problem of '0' RT reference glitches on 120 A CODs.
- 17:45 Preparing to
inject nominal. Injection kicker pre-fire (erratic trigger just before
injection). Checked by experts.
- 19:30 Setup injection
protection (TCDI in TI8, TCLI partly, TDI).
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8:30 meeting
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