LHC 2012 - latest news

Week 17: Machine coordinators: Bernhard Holzer, Gianluigi Arduini

Plan for the week: Recover from technical stop

Plan for the restart (latest)

Date	Summary	Link to report from morning meeting
Monday 30 April	BPM checks test ramp for LHCb neg. leveling plane	8:30 meeting
Sunday 29 April	Start re-commissioning tests on RQF.A12 14:00h Hardware checks for RQF.A12 done, restart the machine 15:00h prepare injection 17:30-21:30 Machine protection checks (BLMs) and tune and orbit feedback chacks 21:30-03:00 Pilot ramp/squeeze: tune, chromaticity, coupling correction check ADT tests for the FMCM	09:00 meeting
Saturday 28 April	00:35 Trip of triplet L5 during squeeze (Power converter). Collimator functions OK during squeeze and collision process 02:00 Access for RBXWTV.L2. Found cooling water valves closed. 02:40 Access finished Several problems (Injection handshake, functions for RCDs, BLM sanity checks sequence, SIS interlocks) 06:30 staring injection and transfer line steering. 09:30 Steering completed 09:30-12:04 TDI checks 12:04: Trip of RQF.A12. Earth fault. 12:04-01:30: Investigation of earth fault on RQF.A12. Short circuit between water cooled cable and metallic box	8:30 meeting
Friday 27 April	Technical stop 18:30 Machine closed. End of patrols Problem with the Beam Imminent Warning Problem with RAMSES in the injectors and LHC requiring accesses in the injectors and LHC. ATLAS toroid trip and leak on a Xe gas line 22:40 Access finished. Still problem with BIW. Start a dry ramp in the mean time to verify machine and collimator functions . Temperature interlock on RBXWTV.L2	Tentative plan presented at the 08:30 meeting
Thursday 26 April	Technical stop
Wednesday 25 April	Technical stop
Tuesday 24 April	Technical stop
Monday 23 April	01:00 Start ADT MD 06:00 Start of TS	8:30 meeting MD1 report