Equivalent circuit study of beam-loading using a moment method

Author

Wang, T.F. ; Machida, S. ; Mori, Y. ; Ohmori, C.

Author_Institution

Los Alamos Nat. Lab., NM, USA

Volume

2

fYear

1997

fDate

12-16 May 1997

Firstpage

1670

Abstract

In this work, we present a formalism by considering the perturbations in the moments of a bunched beam for the equivalent circuit model to include all harmonics of the synchrotron oscillation in a beam-cavity interaction system. The linear coupling among all longitudinal modes under the influence of a narrow-band impedance can be naturally incorporated in this new approach. We used this method to re-examine the coupling between the dipole and the quadrupole modes. The dispersion relation obtained by this new method was compared with that derived from the linearized Vlasov equation up to the second harmonic of the synchrotron motion. We found excellent qualitative agreements between these two approaches

Keywords

Vlasov equation; accelerator cavities; equivalent circuits; particle beam bunching; particle beam dynamics; beam-cavity interaction system; beam-loading; bunched beam; dipole modes; dispersion relation; equivalent circuit study; linear coupling; linearized Vlasov equation; longitudinal modes; moment method; narrow-band impedance; perturbations; quadrupole modes; second harmonic; synchrotron motion; synchrotron oscillation; Coupling circuits; Equations; Equivalent circuits; Moment methods; Narrowband; Particle beams; Power system modeling; Stability; Synchrotrons; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Particle Accelerator Conference, 1997. Proceedings of the 1997

Conference_Location

Vancouver, BC

Print_ISBN

0-7803-4376-X

Type

conf

DOI

10.1109/PAC.1997.750796

Filename

750796