Tuesday morning 08:30-09:00 Squeeze with probe.

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Presentation transcript:

Tuesday morning 08:30-09:00 Squeeze with probe. Very nice and stable orbit – only one ‘spiky’ excursion in the fist part of the squeeze. New parabolic rounding of correctors involved in Xing and separation bumps seems to pay off. Small RT corrections after a few iterations of feed-forward (each at the level of ~60%). Trim by hand 610 out of 925 seconds 2/25/2019 LHC 8:30 meeting

Morning - access 09:00 Just as we wanted to move to collisions, beam dump from access system in Pt8 – shielding wall seen open. Beam gone, 3 sectors OFF from SIS access interlock. Investigation by GS – problem was traced to a cable fault inside a LASS rack. During the investigations, lost all patrols in Pt8. EIS Pt8 seen in bad state during repair  no access possible in the ring. 13:00 New dry test of 90 m un-squeeze. Trip of Q4.R5. Have to lengthen the functions a bit more… 14:00 Machine patrolled. Many thanks to EN/MEF for help with the patrols ! 2/25/2019 LHC 8:30 meeting

Afternoon 15:00 Another access in Pt6 for vacuum (pressure sensor). Pre-cycle, beam back just before 18:00. 18:00: TCDQ angular alignment. Not minimum found for B2 on angle. Decide to remain with ‘0’ angle. B1 TCDQ angle -60 urad, compatible with -100 urad found previously. Apply -100 urad angle. >> new function needed and test ramp. 22:00 TCDI validation prepared ( tonight). Calibration of losses behind collimators. 2/25/2019 LHC 8:30 meeting

Night 23:00 Test ramp and squeeze dumped in ramp – lost S56 & S67, Valves closed, LBDS off due to 400V problem in UA63/67. Cause of trip is not understood. 00:40 400 V back, switching on again. 02:00 Problem with TCSGs in Pt6 – lost steps. STI piquet could reset. 03:30 Ramp finally starting… 04:00 Beam lost in the squeeze, apparently on TCTs in IR8 – collimator functions? Worse than before when the collimator were left in place. 2/25/2019 LHC 8:30 meeting

We can do better.. 2/25/2019 LHC 8:30 meeting

Squeeze 2/25/2019 LHC 8:30 meeting

Losses start ~6m (IR1/5), become massive ~3m (IR1/5) 2/25/2019 LHC 8:30 meeting

Early morning 05:40 S78 trip. Cause unclear… Access needed to restore communication to QPS controller. Next: Collimator setup at 4 TeV (evening) Injection protection validation (night) Thursday: collisions with nominal bunch – only after squeeze problem is understood (another test with probe). 2/25/2019 LHC 8:30 meeting