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Wednesday - day

Wednesday - day. Off-momentum loss map validated. TDI beam1 alignment. New settings defined and applied for both TDIs. Angles [ urad ] to be applied to have jaws parallel:          left     right B1       -70      -750 B2       -190     -110

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Wednesday - day

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  1. Wednesday - day • Off-momentum loss map validated. • TDI beam1 alignment. • New settings defined and applied for both TDIs. • Angles [urad] to be applied to have jaws parallel:          left     right B1       -70      -750 B2       -190     -110 • 13:30: Injection of 336b with 72b per injection. • No vacuum problems in MKIs ~ 1E-9. • 14:15: Ramp. • Beam lost at 3 TeV. • Sudden horizontal instability (2-3 second risetime of losses) on beam2 leading to dump on BLM of TCSG in IR7 (too low threshold?). • VIP intermezzo… LHC 8:30 meeting

  2. Beam 2 instability LHC 8:30 meeting

  3. Loss only visible on 36b batch LHC 8:30 meeting

  4. Wednesday - evening • 22:00: Injection of 336b with 72b per injection. • No vacuum problems in MKIs. • H damper gains increased, 20% stronger octupoles in upper part of ramp. • Ramp ok with signs of transverse H coupled bunch activity, lost QV signal for some time in early part of ramp. QV pushed onto QH for beam1 – ok for the ramp. • Increase octupoles for collisions by factor 2 wrt earlier fills. • Reduced H chromaticity for next ramp ~650 GeV. • 23:55: First stable beams with 72b/train. Fill 1727. • Not a record, but it worked ! 1.1E11/b on average. • Vacuum ok. • 06:00: FBCT B2 gives crazy readings… LHC 8:30 meeting

  5. 72b/train … finally LHC 8:30 meeting

  6. Beam1 emittances after ramp LHC 8:30 meeting

  7. Beam2 emittances after ramp LHC 8:30 meeting

  8. Today • Physics with 480b / 36b per injection. • Coming days: • Physics 480 b/36 b per injection • Physics 336 b/72 b per injection – consolidate LHC 8:30 meeting

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