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

2395 – bare ramp

bare ramp


2395 bare ramp

bare ramp


2395 bare ramp

Q’

bare ramp


2395 bare ramp

tune

bare ramp


2395 bare ramp

bare ramp


2395 bare ramp

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


Naked versus correction

Naked versus correction

bare ramp


2395 bare ramp

1545

Tune modulation up ramp

bare ramp


Tune 1545

Tune 1545

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Tune correction 1545

Tune correction 1545

Tune feedback on – some small correction of modulation

bare ramp


1580 qph correction

1580: QPH correction

bare ramp


1580 qpv correction

1580: QPV correction

bare ramp


Naked versus correction1

Naked versus correction

bare ramp


1584 no tune feedback

1584 – no tune feedback

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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