A Quadrupole Beam Transport Experiment for Heavy Ions under Extreme Space Charge Conditions

Author

Chupp, W. ; Faltens, A. ; Hartwig, E.C. ; Keefe, D. ; Kim, C.H. ; Laslett, L.J. ; Nemetz, R. ; Pike, C. ; Rosenblum, S.S. ; Shiloh, J. ; Smith, L. ; Tiefenback, M. ; Vanecek, D.

Author_Institution

Lawrence Berkeley Laboratory University of California Berkeley, California 94720

Volume

30

Issue

4

fYear

1983

Firstpage

2549

Lastpage

2551

Abstract

A Cs ion-beam transport experiment is in progress to study beam behavior under extreme space charge conditions. A five-lens section matches the beam into a periodic electrostatic quadrupole FODO channel and its behavior is found to agree with predictions. With the available parameters (Â¿200 keV, Â¿20 mA, Â¿Â¿n Â¿ 10-7 Â¿ rad-m, up to 41 periods) the transverse (betatron) oscillation frequency (Â¿) can be depressed down to one-tenth of its zero current value (Â¿o), where Â¿2 = Â¿2o - Â¿2p/2, and Â¿p is the beam plasma frequency. The current can be controlled by adjustment of the gun and the emittance can be controlled independently by means of a set of charged grids.

Keywords

Costs; Current density; Electrostatics; Frequency; Laboratories; Optical beams; Particle beams; Physics; Plasma transport processes; Space charge;

fLanguage

English

Journal_Title

Nuclear Science, IEEE Transactions on

Publisher

ieee

ISSN

0018-9499

Type

jour

DOI

10.1109/TNS.1983.4332877

Filename

4332877