Week 42: Machine coordinators: B. Holzer & M. Lamont
Goal of the week: Luminosity production, MDs (90 m), 24 hours of 25 ns penciled in for Monday 24th October
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Day
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Summary
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Link to report from morning meeting
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Monday 24th October
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- fill 2242 dumped around 5:00 Monday - trip of RCBX.V2.R1(again)
- prepare for 25 ns tests (24 hours)
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08:30 meeting
Special running
Massi Ferro-Luzzi
First look at TOTEM results Karsten Eggert
High bunch intensity instability Elias Metral
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Sunday 23th October
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01:45h dump: failure of RCBX.V2.R1
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03:56h injection
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05:45h luminosity for a couple of hours, fill lost to QPS problem Q9
- bit of a struggle with access system Sunday morning
- 18:00 ramp > 2e14, into stable beam without any problems, 3.5e33 cm-2s-1
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09:00 meeting |
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Saturday 22th October
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- Overnight Friday to Saturday: loss maps, injection issues, 06:45 Stable beams
- 07:45 Loss to Stable beam flag glitch
- 08:34h injection, ramp, squeeze
- 11:14h luminosity
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09:00 meeting |
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Friday 21th October
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02:20h injection, ramp un-squeeze
- qps
trigger in s45, tune trim quads
- new
attempt, successfull, van der meer scans until early afternoon - beams lost to trip of inner triplet power converter L2.
- 25 ns run postponed until Monday
- 17:40 Electrical network glitch - 400 kV manipulation by EDF - Static Var Compensators down around ring, lose Alice, LHC dipoles and ATLAS's torroid.
- 22:00 Back in business
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08:30 meeting |
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Thursday 20th October
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- Switch to Van der Meer scans overnight - unsuccessfully, beams lost in squeeze to software interlock on orbit corrector strength
- Back to TOTEM/ALFA mode - back through unsqueeze by 09:00 Thursday morning
!
- 11:07h pots at 6.5 sigma, data taking
- 18:00h vertical pots approached to 5.5 sigma data
taking.
- 22:00h fill end, dump, precycle
- 22:22h power converter trip, access, change of pc
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08:30 meeting |
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Wednesday 19th October
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- Lower intensity beams unsquoozen overnight for optics measurements at 90 m
- Refill, ramp, unsqueeze for TOTEM, ALFA data taking
- Beam dumped at 16:40 - self trigger of beam dump
- Back in unsquoozen collisions by 20:35
- Beams lost just at start of data taking - power converter L4, access required.
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08:30 meeting |
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Tuesday 18th October
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- 02:10 Fill lost to brief loss of cryo maintain due to a faulty temperature reading caused a slow power abort on the main circuits in S81
- Injection kickers a bit warm back at 450 GeV - 4 hours to cool
- Loss maps at 450 GeV
- 90 m setup during the day, some data taking but high background - bad beam quality, finished with loss maps
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08:30 meeting |
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Monday 17th October
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- 07:00
Dump fil #2219, 123 pb-1 delivered.
- Access for QPS
- Power converter tests at 450 GeV
- 14:11 Stable beams 3.6e33, 1.41e11 ppb
- 15:45 Beam dump - power converter fault
- Next fill lost in adjust, up to 1.45 ppb - looked like head-tail instablity beam 2
- Back into stable beams by 22:10 with slightly reduced bunch current
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08:30 meeting |