Friday March 4 th 01-03-2011 LHC morning report the short story: from a global point of view...... we had basically only one access !!!

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Presentation transcript:

Friday March 4 th LHC morning report the short story: from a global point of view we had basically only one access !!!

Ahead LHC morning report DayShift Time (h) Activity 3THU7:457 Prepare access. 3THU15:005 Ramp to 3.5 TeV with pilot bunch. 3THU20:004 Transverse damper for multi-bunch 4FRI0:008 Beta beat, coupling, beta* correction at 3.5 TeV, pilot bunch 4FRI8:001 BLM tests of new software 4FRI9:008 Trial ramp to 3.5 TeV with 1 nominal bunch (RF blowup, orbit, emittance, damper,...) 4FRI17:008 Collimation setup 3.5 TeV before squeeze, 1 nominal bunch 4SAT1:006 Qualification dump protection, injection protection, collimation 4SAT7:008 Injection and dump setup (higher intensity, MP, …) 4SAT15:008 Collimation setup 3.5 TeV before squeeze, 1 nominal bunch 4SAT23:008 tbd 5SUN7:008 Collimation setup 3.5 TeV before squeeze, 1 nominal bunch 5SUN15:008 tbd 11 hours access in last 24h and more to come…

Friday March 4 th LHC morning report a bit more in detail: Thu 7:00h Access LBDS problem (blocking injection) Access started in pt 2 and 8. Mr Grawer in point 2 Giorgio d'Angelo and RP piquet in point 8 Etienne entering pt 6. QPS RBAC token given to Zinur until 12: in addition gong through the complete access list on the white board. (it’s white now.)

Friday March 4 th LHC morning report Thu 12:00h LBDS problem (blocking injection) Etienne and colleagues are here in the CCC. They reverted to the 2010 version of the code for the detection of the frequencies. in the background: updated the sequences to drive the squeeze (both in one step of in several steps): the PREPARE TUNE FB FOR SQUEEZE has been removed and replaced by a combined task with the sent timing event and the load dynamic ref orbit change. Now, no need to switch OFF tune Feedbacks at the beginning of the squeeze, the change of tune ref and windows will be triggered at the same time as the timing event.... to be checked.

Friday March 4 th LHC morning report Thu 13:21 We can try and close the LHC again. All PCs are fault-less now and prepared for powering, apart from the RD34s and now the story starts: Preparing to precycle, a couple of trips on the way to standby: RSD1.A67B1 RCBCH7.R8B2For these we call the PO piquet. RQT5.R3 RCBWH5.L8B1 These two we reset and restart as they are warm magnets.

Friday March 4 th LHC morning report Thu 13:56 RCD.A12B2 tripped also Piquet role given to B. Dubois (piquet EPC) 14:03 RCBXV2.L8 tripped also 14:04 RCBCV7.L2B2 tripped also. That makes 5 cold and 2 warm.... just for the fun of it: Effect of ignoring the tripped corrector RCBV.7L2.B2.

Friday March 4 th LHC morning report Thu 17:26 LHC SEQ: inj handshake status: experiments and LHC ready for injection 18:22 Both beams injected ok (1 pilot bunch) but: IQC on the injection of the second pilot bunches 19:00 BEAM MODE > Ramp BEAM MODE > flat top BEAM MODE > squeeze

Friday March 4 th LHC morning report Thu 19:00 BEAM MODE > Ramp BEAM MODE > flat top BEAM MODE > squeeze Q and Q' during ramp and first step of the squeeze with dynamic reference for the Q feedback... and it works !!!

Friday March 4 th LHC morning report Thu 19:47 Lost B2. First channel was the MKQA (which was masked, and still is). It looks like a glitch of the SBF Thu 20:36 Thu 21:50 Kicker b1 tripped during the softstrart. We call the BT piquet. Injection & Ramp, Beam dump on top of the ramp. Was due to the loss of a corrector circuit (RQTF.A23B2)

Friday March 4 th LHC morning report Thu 21:50 Beam dump on top of the ramp. Was due to the loss of a corrector circuit (RQTF.A23B2) ref_rate limit apparently exceeded. BEAM MODE > Injection Probe Beam Beam2 dumped by self-triggering of the LBDS. Experts investigating. According to FRANCESCO CASTRONUOVO we did an asynchronous dump, so the specialists want to check-we are preparing for access at 2h00 Thu 23:54 23:55 02:00

Friday March 4 th LHC morning report Fri 04:05... never give up: LHC RUN CTRL: BEAM MODE changed to INJECTION PROBE BEAM Channel number 6 of injection BIC is not ok for both beams. it is again the LBDS According to Alain Antoine, the LBDS is not receiving the power permit. Following the suggestion of Alain, we called Etienne Carlier, who thinks that the problem is on the software side. Fri 07:00... guess what... preparing access

Proposal LHC morning report DayShift Time (h) Activity 4Fri7:457 Prepare access. 4Fri15:005 Ramp to 3.5 TeV with pilot bunch. 4Fri20:004 Transverse damper for multi-bunch 5Sa0:008 Beta beat, coupling, beta* correction at 3.5 TeV, pilot bunch 5Sa8:001 BLM tests of new software 5Sa9:008 Trial ramp to 3.5 TeV with 1 nominal bunch (RF blowup, orbit, emittance, damper,...) 8 Collimation setup 3.5 TeV before squeeze, 1 nominal bunch 6 Qualification dump protection, injection protection, collimation 8 Injection and dump setup (higher intensity, MP, …) 8 Collimation setup 3.5 TeV before squeeze, 1 nominal bunch 8 tbd 8 Collimation setup 3.5 TeV before squeeze, 1 nominal bunch 8 tbd 11 hours access in last 24h and more to come…