Design and initial operation of a shallow-focusing, annular, extraction applied-magnetic-field diode

Author

Neri, J.M. ; Young, F.C. ; Boller, J.R. ; Fischer, R.C. ; Greenly, J.G. ; Hinshelwood, D.D. ; Jones, T.G. ; Oliver, B.V. ; Ottinger, P.F.

Author_Institution

Div. of Plasma Phys., Naval Res. Lab., Washington, DC, USA

Volume

2

fYear

1997

fDate

June 29 1997-July 2 1997

Firstpage

1351

Abstract

A 150-cm/sup 2/ applied-magnetic-field diode has been designed and fielded on Gamble II to produce a focused proton beam for self-pinched ion-beam-transport studies. For a beam divergence of 20 mrad, the diode should focus 200 kA of protons to <2-cm radius at 70 cm from the anode. The diode is insulated with magnetic-fields from two coils driven by a main current of up to 50 kA and 100-/spl mu/s risetime. An opposite-polarity current pulse of 2-ms half-period, prior to the main pulse, is used to position the B-field separatrix near the anode and remove angular momentum from the extracted beam.

Keywords

focused ion beam technology; magnetic devices; power supplies to apparatus; proton beams; proton sources; pulse generators; pulsed power technology; 100 mus; 2 ms; 200 kA; 50 kA; 70 cm; B-field separatrix; Gamble II pulsed power generator; anode; applied-magnetic-field diode; focused proton beam production; opposite-polarity current pulse; pulsed power supplies; self-pinched ion-beam-transport studies; Anodes; Coils; Diodes; Hardware; Insulation; Ion beams; Particle beams; Physics; Protons; Structural beams;

fLanguage

English

Publisher

ieee

Conference_Titel

Pulsed Power Conference, 1997. Digest of Technical Papers. 1997 11th IEEE International

Conference_Location

Baltimore, MA, USA

Print_ISBN

0-7803-4213-5

Type

conf

DOI

10.1109/PPC.1997.674590

Filename

674590