Global Minimization of Longitudinal Emittance in RF Linac Structures

Author

Lange, S. ; Clemens, M. ; Limberg, T. ; Dohlus, M.

Author_Institution

Dept. for Theor. of Electr. Eng. & Comput. Electromagn., Helmut-Schmidt-Univ., Hamburg

Volume

44

Issue

6

fYear

2008

fDate

6/1/2008 12:00:00 AM

Firstpage

1090

Lastpage

1093

Abstract

Relativistic electron bunches in linear accelerators are characterized by 6-D phase spaces. In most linear accelerators, the longitudinal phase space distribution does not interact significantly with the transverse distributions. This assumption allows the use of a 2-D design model of the longitudinal phase space. In this paper a global convergent parameter optimization is proposed to achieve an optimal bunch compression design with respect to an exact bunch energy, peak current and a vanishing skewness in the current profile, minimizing the longitudinal emittance by using a genetic algorithm and sequential quadratic programming hybrid formulation to find an optimal bunch.

Keywords

genetic algorithms; linear accelerators; minimisation; particle beam bunching; quadratic programming; relativistic electron beams; 6D phase spaces; RF linac structures; current profile; genetic algorithm; global convergent parameter optimization; linear accelerators; longitudinal emittance minimization; longitudinal phase space distribution; optimal bunch compression design; quadratic programming hybrid formulation; relativistic electron bunches; transverse distributions; Free electron laser; GA optimization; SQP optimization; linear accelerator; longitudinal phase space;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2007.915984

Filename

4526926