2395 bare ramp
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2395 – bare ramp. Q’. tune. Snapback – Q’. Fit snapback: I(t) – MB current at time t I injection – injection value of current b 3 and I are fitting constants b 3 and I are correlated. Sextupole compensation during snap-back in collaboration with FNAL – Luca Bottura.

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2395 – bare ramp

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2395 – bare ramp

bare ramp


bare ramp


Q’

bare ramp


tune

bare ramp


bare ramp


bare ramp


Snapback – Q’

  • Fit snapback:

  • I(t) – MB current at time t

  • Iinjection – injection value of current

  • b3 and Iare fitting constants

  • b3 and Iare correlated

Sextupole compensation during snap-back in collaboration with FNAL – Luca Bottura

bare ramp


Faster snapback

bare ramp


Naked versus correction

bare ramp


1545

Tune modulation up ramp

bare ramp


Tune 1545

bare ramp


Tune correction 1545

Tune feedback on – some small correction of modulation

bare ramp


1580: QPH correction

bare ramp


1580: QPV correction

bare ramp


Naked versus correction

bare ramp


1584 – no tune feedback

bare ramp


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

bare ramp


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