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The role of the focusing field profile on the stability of periodically focused particle beams

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The role of the focusing field profile on the stability of periodically focused particle beams

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Título The role of the focusing field profile on the stability of periodically focused particle beams
Autor Moraes, Jorge da Silva
Rizzato, Felipe Barbedo
Pakter, Renato
Abstract In this paper, the role of the focusing field profile on the stability of periodically focused particle beams is investigated, paying special attention to the transport within the new regions of stability found recently for vacuum-phase advances well above 90° [R. Pakter and F. B. Rizzato, Phys. Rev. Lett. 87, 044801 (2001)]. In particular, a solenoidal focusing field profile that goes from a smooth sinusoidal-like function to a sharp-edged step-funcion as a continuous parameter is varied is considered. It is shown that the new regions are always present, but may be very sensitive to changes in the focusing field profile. Specifically, as the focusing field becomes more localized, the new regions become narrower, occur at higher vacuum phase advances, and present a larger number of nonlinear resonances and chaos in the beam envelope phase space. Although in all the cases analyzed here it was found that there is a relatively thick layer of regular trajectories isolating the matched solution from the chaotic region, self-consistent simulations show that envelope phase-space chaos may affect beam dynamics, leading to some small emittance growth.
Contido em Physics of plasmas. Melville. Vol. 10, no. 12 (Dec. 2003), p. 4811-4817
Assunto Óptica de partículas
Origem Estrangeiro
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/141207
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