LHC 2011 - latest news

Week 20: Machine coordinators: Gianluigi Arduini, Bernhard Holzer.

Goals of the week: re-establish physics conditions, alignment of RPs, increase intensity

LHC coordination vistar

Day	Summary	Link to report from morning meeting
Monday, 23^rd May	08:00 restart, set up injection	08:30 meeting
Sunday, 22^nd May	07:00 Beam dump: end of STABLE BEAMS #1799: 25 pb^-1. Record integrated luminosity in 24 hours: 33.33 pb^-1 Power glitch at 09:09. Trip of sector 67 and 81 11:00 - 13:00. Injection. Observation of blow-up dump and refill with lowr chormaticity 14:24 Stable beams #1800: 912 bunches/train - Initial luminosity 9.4x10^32 cm^-2s^-1 15:40. ALICE solenoid trip and RF dump. End of fill #1800. 4.4 pb^-1 in 1.4 h. 20:40 Stable beams #1801: 912 bunches/train - Initial luminosity7.7x10^32 cm^-2s^-1. Blow-up observed during the ramp B1V. 21:27. RF dump. End of fill #1801. 02:13. Stable beams #1802. 912 bunches/train - Initial luminosity1.1x10^33 cm^-2s^-1 05:25. RF dump. End of stable beams #1802.  11.3 pb^-1 in 2 h.	.09:00 meeting
Saturday, 21^st May	3:08 stable beams, 768 x 768. 108 b/train. Initial luminosity: 7.5x10^32 cm^-2s^-1. 12:00 End of stable beams #1798. RF end of fill test. 18.9 pb^-1 in 9 hours 13:55 Beam dumped after RF test (switch 15:00-18:00 Access for ATLAS and QPS piquet (reset of QPS controller) 20:34 STABLE BEAMS #1799 - 912 bunches/train - Initial luminosity 8.5x10^32 cm^-2s^-1. More than 10^14 p/beam in collision.	09:00 meeting
Friday, 20^th May	7:44 beam dump due to cryo problem in point 81 (controller of DFBAA cryo-valves) Luminosity until then 18.5 pb^-1 in 8.1 h. Access for replacement of the controller for the DFBAA cryo-valves 12:00h restart: check injection losses for 72 bunch transfer / 108 bunch transfer 14:00 injection of 768 x 768 bunches, dump for IP6 BPM interlock test 15:00h injection of 768 x 768 bunches (108 bunch trains) for luminosity  ramp,squeeze, collisions 16:00 stable luminosity 16:46 beam dump, QPS problem in RQ10.L1.B1 17:00-20:30 Investigations on Q10.L1QPS trip 20:30-23:30 trip of triplet power converters. Recovery.	08:30 meeting
Thursday, 19^th May	00:00 - 01:00 loss maps at injection 01:00 - 06:00 Attempts to fill for physics with 768 bunches/beam (72 bunches/train). Vacuum instabilities jn the triplet L8 related to beam screen temperature fluctuations. 06:00 - 11:00 Investigations from vacuum and cryogenics 11:20 Trip of sector 67 (QPS) 11:20 - 15:00 Access for QPS intervention 15:00-17:00 Setting-up of injection with 108 bunches 17:00-20:00 Injection of large number of bunches 20:00 1308 bunch/beam injected 21:20 Beam dump due to vacuum spike close to D1.R2 23:30 Stable beams #1795. Peak luminosity 7.7x10^32 cm^-2s^-1.	08:30 meeting
Wednesday, 18^th May	01:00-06:30 Fill #1787 – 480 bunches with 72 bunches/train – 4.4x10^32 cm^-2s^-1 initial luminosity – 3.4 pb^-1 in 2.3 hours. End of fill test of measurement of transient beam loading when switching off a cavity. 06:30 - 21:30 ALPHA/TOTEM roman pot beam based alignment. Loss maps done (except off-momentum) 21:30 - 24:00 - Ramp-down and modification of the acceleration rate for the RF frequency trims.	08:30 meeting
Tuesday, 17^th May	01:30-03:30 Access for replacing the power trigger unit of MKB B1 03:30-05:00 pre-cycle and prepare for injection 05:00-06:00 Injection of trains of 72 bunches for preparing the fill with 480 bunches. Losses at injection 06:00 Start preparation for roman port alignment (ALPHA and TOTEM) 10:00 3.5 TeV - colliding. Start roman pot alignment ... 10:54 beam dump due to roman pot movement 11:50 sector 81 & 12 tripped during pre-cycle (SPS main quadrupole power supply tests) 13:06 end of pre-cycle, trip of sector 78 13:00 - 18:00 Investigations on the trips of Sector 78 main quadrupoles. 18:30 finally successful pre-cycle after restoring threshold on nQPS (B11.L8) 18:30 No injection permit from CMS 19:00 Injection of B2. Power converter problem on RBIH.610337 19:30-01:00 Injection setting-up of up to 144 bunches/train	8:30 meeting
Monday, 16^th May	Overnight Sunday to Monday: 50 ns inojection optimization, issues with transverse damper settings, ramp lost to electrical network glitch early morning 11:26 STABLE BEAMS #1785 (228 bunches/beam - 36 bunches/injection) - peak lumi 1.9x10^32 cm^-2s^-1 Length scale calibration in ATLAS 15:00 ADJUST MODE: end of fill #1785 (1.8 pb^-1) test to see effect of a trip of a klystron. Issues with logging of abort gap population 17:00 Beams dumped by operator. 17:30 trip of triplets power converters in point 8. Access for Power Converter piquest and for QPS piquet for replacement of QH power supply switch in Sector 56 21:30 end of access. 22:20 Accidental CMS operator dump 22:30-23:30. Abort Gap Keeper check. Last bunch that can be systematically injected. 23:30-01:30 Loss maps: Horizontal for B1 and B2. Vertical for B2. Off momentum@+/-1kHz for B2. LBDS self-trigger. Access	8:30 meeting VdM run summary (MFL)