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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Presentation Transcript
slide3
Q’

bare ramp

slide4
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

slide10
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

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