Week 34: Machine coordinators: Gianluigi Arduini and Ralph Assmann
Luminosity production, 90m optics run and Machine Development
Adiabatically increase beam intensity
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Day |
Summary |
Link to report from morning meeting |
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Monday 29th August |
· 09:00 Lost cryo maintain in Sector 78. Again problem on temperature sensor for RQTL9.R7B1. Access in Sector 78 again. · 04:42 Beam dump due to collimator position in LSS7. End of MD#3 and preparation for technical stop. · 06:00 Start of Technical Stop |
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Sunday 28th August |
· 01:43 Cryo recover and start-precycle · 02:48 Lost cryo maintain in MR2 - pre-cycle matching section again. In the shadow test of the collimator functions for the tight collimator settings. · 04:15 Injection of B1. No Beam 2 problem due to vacuum problem in TI8 (some ion pumps stopped) · 06:13 Trip of sector 67 (main quadrupole trip due to loss of communication with QPS controller MQ.24R6). Access to repair: F3 circuit breaker spurious opening · 09:00 Lost cryo maintain in Sector 78. Again problem on temperature sensor for RQTL9.R7B1. Access in Sector 78 again. · 15:20 Injection. MD beta*=1m - Part 2 |
9:00 meeting |
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Saturday 27th August |
· Cryo recovery in Sector 23. In the shadow intervention on temperature sensor for RQTL9.R7B1 (access from 13:30 to 20:30 for connector repair) |
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Friday 26th August |
· 01:00 MD transverse damper emittance blow-up. · 07:00 Collimator problem. · 08:00 MD triplet aperture. · 16:00 MD 25 ns injection · 17:00-21:00 Trip due due to thunderstorms and recover · 22:50 Lost cryogenics in Sector 23 due to a trip of the 3.3 kV · Cryo recovery in Sector 23 |
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Thursday 25th August |
· 05:00 MD beam instrumentation. · 13:00 Short access for ADT. Several issues afterwards: IR8L triplet tripped, ADT issues. · 18:40 MD long-range beam-beam. First fill lost during squeeze, second fill provided 1h time for measurements. |
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Wednesday 24th August |
· 01:06 All TCTs aligned · 04:53 All TOTEM vertical roman pots aligned. Problem with ALFA roman pot position reading. · 05:16 Power glitch. Trip of compensators in point 2 and 8 · Ramp-down and preparation of 1m beta* MD · START OF MD SESSION #3 · 07:00 MD beta*=1m · 07:45 Squeezed to 1.5 m (1 pilot per beam) · 08:15 Loading of functions and checks before squeezing to 1 m · 09:15 Squeezed to 1 m OK. Start beta beating measurements. · 18:30 Electrical glitch. Several sectors tripped. Recovery. · 23:54 MD long bunch length. |
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Tuesday 23th August |
· 02:30 Reverted back to previous ADT firmware and prepare access for orbit corrector FGC · 05:30 Ready to inject for RF study in preparation of the MD. In parallel preparation of the settings for the 90 ms optics run. · 09:00 Start 90 m optics run. · 10:30 Ready for injection. Problems in the orbit acquisition due to the selected filling scheme with bunches of different intensity. · 14:00 Fill with 5 bunches with 6x1010 p/bunch · 15:00 Lost beam during the ramp due to a problem on an RF frequency distribution module requiring a reboot · 17:00 refill after fixing problem with RF module · 18:30 Beam dump during the squeeze due to a trip of a triplet orbit corrector. Traced back to a problem in LSA function trims · 20:00 Filling (3 bunches with ~7-8x1010 p/bunch) · 21:47 90 m beta* · 23:47 Beams colliding at all IPs and start TCT alignment |
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Monday 22nd August |
· 00:07 stable beams · 18:00 Programmed dump. End of physics #2040. ~83 pb-1 in ~18 hours · Test of the coupling functions for the squeeze to 1 m. · Trip of Sector 78 during the ramp-down (noise on QPS board) · Loading of new damper firmware for controlled emittance blow-up, RF measurements without beams and ATLAS access during recovery form Sector 78 trip · 21:00 Ready for injection but problem with injection kicker (generator not charging the PFNs Beam 2) and later with LBDS (tracking fault on Beam 1) · 22:45 Ready for injection. Issues with the transverse damper settings and with the RF of beam 1 · Problems with RF Module 1 Beam 1 (2 trips) and MKB generator Beam2 |