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1545

1545. Tune 1545. Tune correction 1545. 1580: QPH correction. 1580: QPV correction. Naked versus correction. 1584 – no tune feedback. Observations. Tunes and chromaticities more-or-less identical for both beams

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1545

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  1. 1545 LHC startup progress

  2. Tune 1545 LHC startup progress

  3. Tune correction 1545 LHC startup progress

  4. 1580: QPH correction

  5. 1580: QPV correction

  6. Naked versus correction

  7. 1584 – no tune feedback

  8. Observations • Tunes and chromaticities more-or-less identical for both beams • Watch carefully de-convolution of tune correction of tune modulation given by RF frequency modulation • Pseudo spikes at start of ramp; offset in estimate • b3 snapback correction 50% of total swing • Approx total swing: H -34.8 V 25.42 • Snapback time constant looks more or less OK • Most of it’s over after around 21 seconds

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