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LARP AC Dipole Task

LARP AC Dipole Task. Deliverable Current hardware design: FNAL approach Resonant pulsed kicker 20 kwatt power amplifier to achieve the field For future: BNL approach High Q magnet with tunable circuitry. LARP AC Dipole Task. Deliverable Software AC dipole control application FNAL

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LARP AC Dipole Task

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  1. LARP AC Dipole Task • Deliverable • Current hardware design: FNAL approach • Resonant pulsed kicker • 20 kwatt power amplifier to achieve the field • For future: BNL approach • High Q magnet with tunable circuitry

  2. LARP AC Dipole Task • Deliverable • Software • AC dipole control application • FNAL • Accelerator physics application • linear optics measurements/corrections • Non-linear resonance driving term

  3. RHIC AC Dipole Status • Requires two more ac dipoles@Qacd=0.5 • Magnet specs: • Amplitude of the field: 100 Gauss-m • Frequency range: +-390Hz@39kHz • Explore the switched capacitor technique for continuous tuning (P. Oddo(BNL)) Binary switched capacitor scheme Peter is testing single capacitor scheme for which a biased voltage is applied to the capacitor to adjust the capacitance

  4. Linear optics measurement and corrections • Analyze the RHIC 2007 optics data • Dedicate optics data sets taken with single quadrupole error. • Currently, the RHIC beta function and phase advance measurements by ac dipole are calculated by fitting the 1024 turns of TBT data with

  5. RHIC ac dipole optics data – 2007baseline

  6. RHIC ac dipole optics data – 2007bo8-tq5=0.005

  7. RHIC ac dipole optics data – 2007difference

  8. Plan for AP • Re-analyze the RHIC 2007 optics data • Need to add the term of (1-Qacd) to the fitting to take into account the effect of the driven oscillation at (1-Qacd) which can be significant when betatron tune gets closer to 0.5 according to R. Miyamoto(FNAL)

  9. δ ν νd 1-νd 0 1 From R. Miyamoto (FNAL) Analytic Expression of the Driven Oscillation

  10. From R. Miyamoto (FNAL) Measuredβ For RHIC and LHC, the effect can be as large as 6%

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