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December 14, 2009: Beam Adjustments and Challenges in Cryogenic and QPS Systems

On December 14, 2009, we faced various challenges with the QPS system after recovering from a cryogenic fault. Despite initial struggles, issues with QPS were eventually resolved, and we were able to complete pre-cycles. After several adjustments, including tune and chromaticity settings, we witnessed beam loss and further difficulties that required recycle measures. The day ended with successful preparations for new fills, beam dumps, and plans for the upcoming week, including collider setups and commissioning tasks aimed at enhancing luminosity production and optimizing performance.

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December 14, 2009: Beam Adjustments and Challenges in Cryogenic and QPS Systems

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  1. 14.12.2009 -07:00: recovered from cryo fault but still struggling with QPS system -18:30: finally solved QPS issues and finished pre-cylces -19:15: inject beam and adjust tune and Q’ -20:30: tripped sector 12 due loss in cryo maintain due to faulty temperature reading  need to recycle -22:15: ready to re-inject again -22:40: start ramp -22:45: lost Beam2 at 800 GeV triggered by BPMinterlock even though it was masked in the BIC Caused by problem of the BCT Continue measurements on Beam1: -chromaticity and tune; orbit; beta-beat; dispersion; RF loop for online Q’ measurement; beam dump for Beam1 -00:40: Try second ramp Summary of 14.12.2009

  2. 14.12.2009: Q & Q’ after correction before ramp Beam1: Horizontal Q‘ for Beam2 requiredtrim of -15! Beam2: Summary of 14.12.2009

  3. 14.12.2009: Synchrotron light monito Beam2: Summary of 14.12.2009

  4. 14.12.2009: Raw orbit at end of ramp Beam1: Summary of 14.12.2009

  5. 14.12.2009: Q and Q’ at end of ramp Beam1: Beam2 Chromaticities trimmedby of -13 / +12! Beam2: Summary of 14.12.2009

  6. 14.12.2009: beta-beat at end of ramp Beam1: beta-beat within 20% Summary of 14.12.2009

  7. 14.12.2009: beta-beat comparison 450 GeV toend of ramp Summary of 14.12.2009

  8. 14.12.2009: dispersionat end of ramp Beam1: Beam2: Summary of 14.12.2009

  9. 14.12.2009: Radial modulation for Q’ measurement Beam1: Summary of 14.12.2009

  10. 14.12.2009: Beam dump Beam1: Summary of 14.12.2009

  11. 14.12.2009 -00:40: Communication problems with RF at end of pre-cylce finished pre-cycle and ready for next ramp: -02:00: Preparing new fill: some collimators were in park position after cycle -02:20: Start new fill: switched Q-FB on for both beams, references: B1: Qx = 0.280; Qv = 0.315 B2: Qx = 0.280; Qv = 0.310 -02:40: Both beams at top energy with excellent lifetimes measurements -04:00: Declaring quiet beams -06:00: Dump both beams  all sectors tripped Summary of 14.12.2009

  12. 14.12.2009: Tune second ramp Beam2: Summary of 14.12.2009

  13. 14.12.2009: Second ramp Summary of 14.12.2009

  14. 14.12.2009: Second ramp Summary of 14.12.2009

  15. 14.12.2009: Second ramp BLMs Summary of 14.12.2009

  16. 14.12.2009: Second ramp Orbit movement Summary of 14.12.2009

  17. 14.12.2009: Second ramp Orbit movement Summary of 14.12.2009

  18. 14.12.2009: Second ramp dump Summary of 14.12.2009

  19. 14.12.2009:Plans for rest of year: -MPS and beam dumping system at 1.1 TeV (end of ramp?) -Protection devices and collimation system setup at 1.1 TeV -intermediate energy dumps -Finish luminosity production at 450 GeV with 16 on 16 bunches bumps at TOTEM Roman Pots at end of fill -Turn separation bumps on at IPs -High intensity at 450 GeV: 16 x 5 1010 per beam -abort gap cleaner commissioning -Orbit bumps at synchrotron light monitor (end of fill) -test b* knobs and squeeze at 450 GeV Summary of 14.12.2009

  20. 14.12.2009: Plan for the weekend: • -ATLAS aperture re-check in horizontal plane • Other miscellaneous work: • -finish circuit polarity checks • -finish kick response measurements • -orbit feedback commissioning • -nQPS quench threshold test with beam (bunch intensity < 2 109) Summary of 14.12.2009

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