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Amundson, J.F.

Paper Title Page
MOPD40 Third Integer Resonance Slow Extraction Scheme for a mu->e Experiment at Fermilab 153
  • V.P. Nagaslaev, J.F. Amundson, J.A. Johnstone, L. Michelotti, C.S. Park, S.J. Werkema
    Fermilab, Batavia
  • M.J. Syphers
    MSU, East Lansing, Michigan

The current design of beam preparation for a proposed mu->e conversion experiment at Fermilab is based on slow resonant extraction of protons from the Debuncher. The Debuncher ring will have to operate with beam intensities of 2-3 x 10**{12} particles, approximately four orders of magnitude larger than its current value. The most challenging requirements on the beam quality are the spill uniformity and low losses in the presence of large space charge and momentum spread. We present results from simulations of third integer resonance extraction assisted by RF knock-out (RFKO), a technique developed for medical accelerators. Tune spreads up to 0.05 have been considered.

WEO2C05 Wake Functions for Laminated Magnets and Applications for Fermilab Booster Synchrotron 529
  • A. Macridin, J.F. Amundson, P. Spentzouris
    Fermilab, Batavia
  • D.O. McCarron
    IIT, Chicago, Illinois
  • L.K. Spentzouris
    Illinois Institute of Technology, Chicago, Illinois

The Fermilab Booster beam is exposed to magnet laminations, resulting in impedance effects much larger than resistive wall effects in a beam pipe. We present a calculation of wake functions in laminated magnets, which show large values at distances of the order of a few meters, but decrease quickly to zero beyond that. Therefore, strong in-bunch and nearest-bunch effects are present. We show realistic Synergia simulations of the Booster using these wake functions and space-charge solvers appropriate for the various geometries of the constituent elements of the machine. The simulation of tune shifts is in good agreement with experimental data. We find that wake fields in the Booster magnet laminations strongly increase beam emittance and have the potential to cause significant beam loss.


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