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LHC Operations Report: Stable Beams and Challenges from Saturday to Sunday

This report covers the LHC operations from Saturday evening through Sunday morning, detailing key activities including the refill for the RP setup, Roman pot alignment, and loss map assessments. It highlights the challenges faced, including electrical perturbations and a thunderstorm that resulted in brief access requirements for safety systems. The report also notes successful target fill achievements, stable beams, and the nominal current restoration in the ATLAS toroid, alongside an initial luminosity of 5.9 x 10^33 cm^-2 s^-1 during fill 2816.

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LHC Operations Report: Stable Beams and Challenges from Saturday to Sunday

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  1. Saturday • 7ish – refill for RP set-up • 9:15 Going for Roman pot alignment. Stefano is coming. • 12:10 TOTEM: Alignment of horizontal RPs B2 finished, short period of data taking • 13:10 loss maps • 13:20 beams dump during off-momentum loss map • 14:10 Access for ATLAS (CMS in as well) • muon chamber TGC and safety detector system (sniffer) • 15:10 Access finished • 16:00 Injecting for physics • 17:35 Stable beams fill 2816 • Initial luminosity 5.9 e33 cm-2s-1 • ~1.43e11 ppb at start of fill LHC status

  2. Sunday morning • 02:55 ATLAS toroid back up to nominal current • 05:27 Fill 2816 lost to Electrical perturbation visible on several power converters. FMCM triggered first for RD1.LR5. • 144 pb-1 in 11 hours 51 minutes of stable beams • 06:16 filling again • 06:53 Thunderstorm. All sectors apart from sector 12 trip. • Access required for QPS – Q9.L6 – can’t reset QPS (remote power cycle not possible) • RF, collimators look OK LHC status

  3. 2816 Losses at start of squeeze and going into collision were at the 30-40% level, but there was no noticeable instabilities. Note that we used the I_measure values on RQTF.A12B2 as an indicator of the B2_H tune setting LHC status

  4. vertical emittance for some PSB rings was noticably larger LHC status

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