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Wednesday 14 th July

Wednesday 14 th July. Stable beams 11:26 All Roman pots to 30 sigma Modification to the longitudinal damper: increase of max amplitude from 0.6 deg rms to 1 deg rms @ 40 MHz. 17:03 Lost beams Multiple FMCM Instability on the electrical network 17:02:53. Evening

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Wednesday 14 th July

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  1. Wednesday 14th July • Stable beams • 11:26 All Roman pots to 30 sigma • Modification to the longitudinal damper: increase of max amplitude from 0.6 deg rms to 1 deg rms @ 40 MHz. • 17:03 Lost beams • Multiple FMCM • Instability on the electrical network 17:02:53. • Evening • There is no more limit on the range of acceptable injection bucket number. The previous problem with bucket 29701 is solved... • Alice compensators trip. TI confirmed an electrical instability at the same time (21:47) the two experimental compensators tripped.

  2. Wednesday evening • With a huge effort and a "temporary fix" the MPS team have the supply up and running once more. • “The MPS experts have all understood this temporary fix” • 22:15 Final PSB problem – inverted quadrupole polarity • 22:45 Beam back • 23:49 RF problem at the PS and the injected indiv in the SPS is not clean (it has satellite bunches...).

  3. Thursday 15th July morning • 04:18 Stable beams – fill 1226 • 13 bunches 8_8_8 – providing a truly non-colliding bunch • Scan CMS, LHCb, Atlas, adjust Alice • 1.2 Hz microbarn-1 • 05:55 Totem: All pots are now at 30 sigmas. Starting the acquisitions. • 06:52 All vertical pots moved to 25 sigmas. • Note some FESA issues

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  5. Hump

  6. Today • Stop physics midday • Hump investigations at 450 GeV • GSM off in tunnel ~ 2 hours • [Multi-bunch injection from SPS] • Bren & co – 1 shift – pushed to Friday • Physics • LHCf would like some more low pile-up data - will be tried with one additional colliding pair at IP1/5 with about half nominal intensity - requires some checks at injection. • Single_14b_9_8_8 (with a low pile-up bunch in RF bucket 1) or variant ghosts…

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