LHC 2011 - latest news

Week 22: Machine coordinators: Ralph Assmann, Bernhard Holzer

Goals of the week: Produce > 250 pb-1 in the week

LHC coordination vistar

 

Day

Summary

Link to report from morning meeting

Monday, 6th June

·        00:31 Beam dump: QPS trigger on RQTL11.R7B1. Length stable beams: 15h05.

·        07:30 Stable beams. Fill #1854.

·        07:39 PC failure of RQ6L2. Length stable beams: 00h09.

08:30 meeting

Sunday, 5 th June

·        00:15 Dump: RF trip. Length stable beams: 0h46.

·        01:43 injection, ramp, squeeze, adjust.

·        03:48 Beam dump at 3.5TeV: LHCb magnet trip

·        04:13 injection, ramp, squeeze.

·        06:30 Stable beams. Fill #1851.

·        06:56 Dump: Ufo MKI pt 2. Length stable beams: 0h26.

·        08:30 injection for physics

·        09:26 Stable beams. Fill #1852. Lumi ~1.1e33.

09:00 meeting

Saturday, 4th June

·         02h16 Stable beams. Fill #1845. Lumi ~1.1e33.

·        07h56 Beam dump: QPS FIP communication lost, close to IR1. S12 tripped. Length stable beams: 5h45     

·        11:26 Injection for physics.

·        13:24 Stable beams. Fill #1846.

·        16:19 Dump: Power converter fault. Length stable beams: 2h55.

·        19:00 injection, ramp.

·        20:20 Beam dump at 3.5TeV: Ufo at MKI pt 2

·        21:10 injection

·        22:44 ramp squeeze

·        23:29 Stable beams. Fill #1848.

09:00 meeting

Look at dumps (M. Lamont)

Friday, 3rd June

·        00h28 Beam dump @3.5TeV: Trip of RQTF.A23B2 during squeeze.

·        05h55 Stable beams. Fill #1841. Lumi ~1.2e33.

·        13h30 Beams dumped: Loss of I_meas reading (only channel A of PC) for 4 ms. This tripped the PIC. Note that the after the loss of I_MEAS, the signal came back. Delivered lumi: 27.5pb-1. Length of stable beams: 7h35.

·        18h24 Beam dump @3.5TeV: UFO in IR8R during squeeze.

·        20h54 Stable beams. Fill #1844. Lumi ~1.1e33.

·        21h17 Beam dump: Undulator IR4 tripped. Reset was needed. Length of stable beams: 0h23.

·        23h30 Cryo back for ML4.

09:00 meeting

Thursday, 2nd June

·        00:31 Injection

·        01:29 Ramp

·        02:03 Stable beams. Fill #1836. Lumi ~1.2e33.

·        16:58 Beams dumped by EIC. Stable beams for 14h55. Produced 46 pb-1.

·        21:17 During ramp: UFO in IR8R. At 12% of dump threshold. Survived.

·        21h46 Stable beams. Fill #1839. Lumi ~1.2e33.

·        21h50 Beam dump: UFO IR8. Stable beams for 0h04.

09:00 meeting

Wednesday, 1st June

·        01:45 ramp & squeeze

·        02:10 Beam dump @3.5TeV: QPS trigger (Quench of Q9R5 ? )

·        05:51 injection for physics, ramp & squeeze

·        06:53 Beam dump @3.5TeV: RF trip (radiation-induced arc detector signal?)

·        07:45 Injection for physics

·        09:17 Ramp. Dump during ramp: collimator temperature

·        10:16 Injection pilot bunch. Increase bunch length target from 1.2ns to 1.25ns.

·        10:20 SPS intervention as planned. No beam for injection.

·        11:36 Injection setup 144b. A few injectors issues on the way. Injection of 1092b with 144b batches. Beam dump test. All fine (vacuum, …).

·        17:04 Injection for physics with 108b batches.

·        18:50 Ramp.

·        19:31 Stable beams. Fill #1835. Lumi ~1.2e33.

·        20:37 Beam dump: Collimation crate IR5R down (SEU?). Length stable beams: 1h06. Lost cryo maintain S78 (SEU?). S78 tripped. Access for collimation crate.

·        22:44 Cycling

08:30 meeting

Tuesday, 31st May

·        01:47 Injection

·        02:25 Emittance blowup. 450 GeV beams in LHC dumped. Booster optimizing.

·        03:36 Injection 1092b.

·        05:55 Stable beams #1822.

·        06:22 Beam dump. UFO IR2L. Length stable beams: 0h27.

·        07:16 Injection.

·        09:25 Stable beams #1823.

·        10:38 Beam dump: cryo lost in S56: communication with DFBAJ (SEU?). Length stable beams: 1h13.

·        15:00 - 17:00 check & optimisation of TCLIb

·        17:17 Cryo lost in S34

·        19:09 injection for physics, ramp & squeeze

·        22:20 Beam dump @3.5TeV: UFO IR2L.

·        23:15 Injection for physics.

08:30 meeting

Monday, 30th May

·        01:00 Injection for physics fill #1816

·        02:00 Stable beams fill #1816, luminosity ~1.2x1033 cm-2s-1

·        11:08 Beams dumped. Length of stable beams: ~9h00. QPS trigger on detector of RCBXH2.L1.
Circuit detector has been stalled prior to the event (cause not clear but radiation not excluded even likely) and automatically RESET by watchdog. The trip occurred during the RESET.

·        12:01 CMS access.

·        13:17 CMS access finished.

·        13:43 Injection of 2 nominal b per beam.

·        15:39 Beams in collisions, optics squeezed, RP at proposed physics settings.

·        15:43 Beams dumped @3.5TeV when switching off the RF for asynchronous dump test. New SIS interlock on RF voltage was not masked.

·        16:31 Injection of probe beam.

·        16:53 No further beam from PS. Parasitic MD to approach integer resonance. Reached 0.03…

·        18:49 Beam back from PS.

·        20:10 Adjust mode. Squeeze done.

·        20:20 Beams dumped @ 3.5TeV by FMCM: electrical glitch due to storm.

·        20:40 Another glitch: we tripped the RD34.LR3

·        21:41 Injection.

·        22:07 Ramp

·        22:58 Collision, squeeze done, RP’s in, RF off for debunching.

·        23:10 Asynchronous dump test.

08:30 meeting
PLC-Cryo issue