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Friday 31 st August & night

Friday 31 st August & night. 00:03 Stable beams #3016. Initial luminosity ~6.7x10^33 cm -2 s -1 . 08:59 Electrical network glitch - Beam dump - ~125 pb-1 in 9 hours . Lost 3 sectors (1-4) with fast abort of the mains and trip of the dipoles of ALICE and LHCb

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Friday 31 st August & night

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  1. Friday 31st August & night • 00:03 Stable beams #3016. Initial luminosity ~6.7x10^33 cm-2s-1. • 08:59 Electrical network glitch - Beam dump - ~125 pb-1 in 9 hours. • Lost 3 sectors (1-4) with fast abort of the mains and trip of the dipoles of ALICE and LHCb • 11:36 At the end of the pre-cycle another electrical problem appeared in point 8 • Problems with the beams from the BOOSTER and a vacuum spike in the SPS extraction kicker (LSS4) • 14:33 Injection physics beams • Large emittances from the injector chain, up to 2.6um for B2V. • 15:33 Lost beam at the very end of the ramp (3.9 TeV) • Trip of IT.R1: the module RTQX2.R1 went in VS_fault, with an overcurrent reading. OK on the next pre-cycle. • 18:55 Stable beam fill #3018, initial lumi 6.6e33 cm-2s-1 • 08:03 Operator dump, integrated lumi’s 173 pb-1 • 08:40 Trip of RQX.R1, same as yesterday afternoon – waiting for news LHC 9:00 meeting

  2. Large beams from the injectors Very likely the cause of the losses end of ramp and the squeeze of the fills Thursday night as well. LHC 9:00 meeting

  3. Fill # 3018 Slightly better emittances from the injectors B2 lifetime suffering during squeeze Initial lumi’s around 6.7 / 6.5 e33 cm-2s-1: suffering from reduced brightness. LHC 9:00 meeting

  4. Check abort gap population by cleaning Effect on measured BLM losses at the collimators is very reproducible B1 Matteo & Lasse B2 LHC 9:00 meeting

  5. Effect on beam current & lumi Matteo & Lasse LHC 9:00 meeting

  6. BSRT B1, out position, stays cold. LHC 9:00 meeting

  7. Injection kicker temperatures Not running long enough to get the injection kickers hot, yet LHC 9:00 meeting

  8. Ahead • Physics • SPS EDF intervention • Monday morning around 9 h for about two hours • Close to CCR again – same test took computers in CCR down • Will only allow safe beams in the LHC • Candidate tests • Rogelio skew sextupole polarity • Rogelio triplet octupole correct circuit tests & polarity • On the waiting list • Totem in at end of fill • RF batch-by-batch blow-up LHC 9:00 meeting

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