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Diagnosis of the FNAL Tevatron Lattice Using an AC Dipole

Diagnosis of the FNAL Tevatron Lattice Using an AC Dipole. Ryoichi Miyamoto UT Austin Fermilab Users Meeting June 7, 2007. x. What is β Function ?. s. F 1. D 1. F 2. D 2. F 1. 3 rd turn. 1 st turn. x [mm]. 2 nd turn. β Function. After 100 turns. After 7 turns.

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Diagnosis of the FNAL Tevatron Lattice Using an AC Dipole

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  1. Diagnosis of the FNAL Tevatron Lattice Using an AC Dipole Ryoichi Miyamoto UT Austin Fermilab Users Meeting June 7, 2007

  2. x What is β Function ? s F1 D1 F2 D2 F1 3rd turn 1st turn x [mm] 2nd turn β Function After 100 turns After 7 turns

  3. Luminosity pbar p Abeam peak luminosity (1030 cm2/sec) number of anti-protons (1010) 300 400 factor of ~10 factor of ~2.5 200 200 100 0 0 July 02 July07 July 07 July 02

  4. Ztot ~ 8 Ω Tevatron AC Dipole System Zmagnet ~ 1 Ω 20 kHz kick p beam B

  5. Excitation Created by the AC Dipole • Recent upgrade of the Tevatron BPM system • allows to measure ~8000 revolutions of • turn-by-turn positions with 20 μm resolutions. adiabatic ramp vertical displacement [mm]

  6. Measured β Function @ 118 BPM Locations

  7. AC Dipole as a Driving Oscillator

  8. An Example of Diagnosis Δβ / βdesign

  9. Summary • Understanding and measuring the Tevatron lattice is important for increasing the Luminosity. • An AC dipole excites driven oscillations of a beam in synchrotron and creates large sustained signals for lattice measurements. • We have verified operations of an AC dipole do not increase the beam size. Non-destructive nature of the AC dipole improves the efficiency of measurements.

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