Intense electron beam disruption due to ion release from surfaces

Author

Davis, H.A. ; Vermare, C. ; Hughes, T.P. ; Moir, D.C. ; Olson, R.T. ; Wood, W.M.

Author_Institution

Los Alamos Nat. Lab., NM, USA

Volume

5

fYear

2001

fDate

2001

Firstpage

3290

Abstract

A major concern for the DARHT second axis (2 kA, 18.6 MeV, 2000 ns) is that ions or ionized neutrals released from solid surfaces (e.g., apertures, septums, dumps, and targets) by beam impact can be accelerated and trapped by the beam potential. This positive charge could disrupt the beam. To study this, experiments were performed on the DARHT first axis. The beam, focused to a range of diameters, is transmitted through thin foils made of various materials. The time-dependent beam radial profile is measured downstream of the target. For low current density, the downstream-beam profile is time invariant as expected. At higher current density, the downstream-beam radius changes during the pulse followed by the transverse instability

Keywords

electron accelerators; linear accelerators; particle beam diagnostics; particle beam stability; 18.6 MeV; DARHT; downstream-beam profile; downstream-beam radius; electron accelerators; electron beam disruption; foils; ion release; linear induction accelerators; surfaces; time-dependent beam radial profile; Acceleration; Current density; Electron beams; Laser excitation; Materials testing; Particle beams; Radiography; Solenoids; Structural beams; Titanium;

fLanguage

English

Publisher

ieee

Conference_Titel

Particle Accelerator Conference, 2001. PAC 2001. Proceedings of the 2001

Conference_Location

Chicago, IL

Print_ISBN

0-7803-7191-7

Type

conf

DOI

10.1109/PAC.2001.988087

Filename

988087