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End-to-end simulation: The front end

Published online by Cambridge University Press:  12 February 2003

I. HABER
Affiliation:
Icarus Research Inc., Bethesda, MD 20824-0780, USA Institute for Research in Electronics and Applied Physics, University of Maryland, College Park, MD 20742-3511, USA
F.M. BIENIOSEK
Affiliation:
Heavy Ion Fusion—Virtual National Laboratory, Berkeley, CA 97420, USA
C.M. CELATA
Affiliation:
Heavy Ion Fusion—Virtual National Laboratory, Berkeley, CA 97420, USA
A. FRIEDMAN
Affiliation:
Heavy Ion Fusion—Virtual National Laboratory, Berkeley, CA 97420, USA
D.P. GROTE
Affiliation:
Heavy Ion Fusion—Virtual National Laboratory, Berkeley, CA 97420, USA
E. HENESTROZA
Affiliation:
Heavy Ion Fusion—Virtual National Laboratory, Berkeley, CA 97420, USA
J.-L. VAY
Affiliation:
Heavy Ion Fusion—Virtual National Laboratory, Berkeley, CA 97420, USA
S. BERNAL
Affiliation:
Institute for Research in Electronics and Applied Physics, University of Maryland, College Park, MD 20742-3511, USA
R.A. KISHEK
Affiliation:
Institute for Research in Electronics and Applied Physics, University of Maryland, College Park, MD 20742-3511, USA
P.G. O'SHEA
Affiliation:
Institute for Research in Electronics and Applied Physics, University of Maryland, College Park, MD 20742-3511, USA
M. REISER
Affiliation:
Institute for Research in Electronics and Applied Physics, University of Maryland, College Park, MD 20742-3511, USA
W.B. HERRMANNSFELDT
Affiliation:
Stanford Linear Accelerator Center, Stanford University, Stanford, CA 94305, USA

Abstract

For the intense beams in heavy ion fusion accelerators, details of the beam distribution as it emerges from the source region can determine the beam behavior well downstream. This occurs because collective space-charge modes excited as the beam is born remain undamped for many focusing periods. Traditional studies of the source region in particle beam systems have emphasized the behavior of averaged beam characteristics, such as total current, rms beam size, or emittance, rather than the details of the full beam distribution function that are necessary to predict the excitation of the collective modes. Simulations of the beam in the source region and comparisons to experimental measurements at Lawrence Berkeley National Laboratory and the University of Maryland are presented to illustrate some of the complexity in beam characteristics that has been uncovered as increased attention has been devoted to developing a detailed understanding of the source region. Also discussed are methods of using the simulations to infer characteristics of the beam distribution that can be difficult to measure directly.

Type
Research Article
Copyright
© 2002 Cambridge University Press

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