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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
Q’

bare ramp


2395 bare ramp
tune

bare ramp




Snapback q
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
Faster snapback

bare ramp



2395 bare ramp
1545

Tune modulation up ramp

bare ramp


Tune 1545
Tune 1545

bare ramp


Tune correction 1545
Tune correction 1545

Tune feedback on – some small correction of modulation

bare ramp






Observations
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