Phys. Rev. ST Accel. Beams 9, 034001 (2006) [11 pages]Minimizing longitudinal distortion in a nearly isochronous linear nonscaling fixed-field alternating gradient accelerator
J. Scott Berg * Received 27 September 2005; published 16 March 2006 Linear nonscaling FFAGs (fixed-field alternating gradient accelerators) are machines that use linear magnets to achieve an extremely large energy acceptance (generally a factor of 2 or more). This paper examines the longitudinal dynamics in such a machine, focusing on the longitudinal acceptance, the phase space area that is transmitted without excessive distortion. The paper shows how to compute the distortion in two ways: computing the emittance growth, and computing the distortion of an initial ellipse from an elliptical shape. The paper will describe a model for the longitudinal dynamics in a linear nonscaling FFAG, show how to compute the longitudinal distortion in such a machine using a Dragt-Finn factorization, examine the accuracy of the calculation, and describe how longitudinal acceptance can interact with other performance criteria for an FFAG. ©2006 The American Physical Society
URL: http://link.aps.org/doi/10.1103/PhysRevSTAB.9.034001 * Email address: jsberg@bnl.gov Electronic address: http://pubweb.bnl.gov/people/jsberg/ [ Abstract | Previous article | Next article | Issue 3 ] |
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