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Published byAshley Kelley Modified over 5 years ago
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Aims for the week Recover from technical stop and precycle at 10A/s
Status Monday morning Pilot and nominal injection OK Pilot bunch ramped to 3.5 TeV Beam dump requalified at 450 GeV and 3.5 TeV Optics OK at 450 GeV Recover LHC operation with nominal bunch Recover 13b operation stable beams for ATLAS in present configuration ATLAS and CMS magnets back to normal configuration. Multi-bunch injection increase intensity factor 2 25b operation Afterward: stable running period with 25 b (~1.5 MJ)… 2/22/2019 LHC status
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Monday - Recover LHC operation with nominal bunch
Access until 14:00 RCS.A45B1 Cryo instrumentation RQD.A23 and RQTL9.R7B1 BLM intervention on SR8.R Mains bus bar detector communication problem in 56 CMS ALICE In the shadow Trajectory corrections in TT60+TI2 Trajectory corrections in TT40+TI8 Beam from 16:00 Setup and short time injecting nominal for injection checks Ramp probe beam for chromaticity measurements Problems with orbit feedback during ramp, orbit degrades Beam 1 dumped by SIS position interlock on TCDQ-TCS Beta-beat measurements at 3.5 TeV with beam 2 2/22/2019 LHC status
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Monday - Recover LHC operation with nominal bunch
Beam again from 20:30 Injection of probes Ramp – no losses, no FB issues, Q’ measurement on the way. Minimized tune RT trims & incorporated into ramp. Beta-beat measurements on the flat top. Very reproducible. Squeeze to 3.5 m. Beta-beat measurement. Very reproducible. Observed ‘erratic’ jumps in the RF frequency (up to 1 permill) from the RT system. Lost beam 2 with this. 2/22/2019 LHC status
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Chromaticity measured through fill 1244
2/22/2019 LHC status
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Beta-beat B1 on flat top (10/11 m)
2/22/2019 LHC status
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Beta-beat B2 on flat top (10/11 m)
2/22/2019 LHC status
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Beta-beat B1 at 3.5 m 2/22/2019 LHC status
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Monday - Recover LHC operation with nominal bunch
Trip of RQT13.R1B2, beams dumped at 01.30 Access needed to fix Beam again at 5.30 Ramp nominal bunches, transverse dampers on Issues again with the RT feedback, but ramp OK Beams lost while preparing squeeze, RQ9.R2 2/22/2019 LHC status
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Tuesday Multi-bunch injection (up to 4 bunches/injection)
Update of BLM thresholds around injection areas by BI-BLM (no beam for 20 minutes). SPS-LHC energy matching fine tuning. Attempt for physics fill with 13b. 2/22/2019 LHC status
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Interventions BLM crate exchange IR7 (to be done before physics with 24b) 4-5 hours (including system tests). 2/22/2019 LHC status
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