Longitudinal instability in HIF beams

Author

Smith, Lloyd

Author_Institution

Lawrence Berkeley Lab., California Univ., Berkeley, CA, USA

fYear

1991

fDate

6-9 May 1991

Firstpage

1064

Abstract

The longitudinal instability which is certain to occur in the heavy ion fusion (HIF) beams in an induction linac (linear accelerator) and is currently considered to be a major question as to the feasibility of the induction linac as an option in accelerator design is discussed. The instability in question is a close relative of the well-known microwave instability in circular accelerators but with distinctive features in this unfamiliar parameter range. That it should occur in a linear accelerator is due to the fact the ions are non-relativistic all the way (10 GeV at mass 200 to 50 MeV/nucleon to beta =0.3) and regenerative bunching can occur at an unpleasant rate in a kiloampere beam subjected to the impedance of the accelerating modules themselves. The author presents the results of analytic and computational work on module impedances, growth rates and feedback (forward) systems.<>

Keywords

beam handling techniques; collective accelerators; ion accelerators; HIF beams; accelerating modules; accelerator design; circular accelerators; computational work; feedback; growth rates; heavy ion fusion; induction linac; linear accelerator; longitudinal instability; microwave instability; module impedances; regenerative bunching; Acceleration; Feeds; Fuels; Impedance; Inertial confinement; Ion accelerators; Linear accelerators; Magnetic materials; Particle accelerators; Particle beams;

fLanguage

English

Publisher

ieee

Conference_Titel

Particle Accelerator Conference, 1991. Accelerator Science and Technology., Conference Record of the 1991 IEEE

Conference_Location

San Francisco, CA, USA

Print_ISBN

0-7803-0135-8

Type

conf

DOI

10.1109/PAC.1991.164537

Filename

164537