24th International Workshop on ECR Ion Sources (ECRIS'20)

A Theoretical Model of High-Bmin Instabilities and Experimental Tests of Its Predictions

29 Sept 2020, 11:15

25m

Oral

Speaker

Damon Todd (LBNL, Berkeley, California)

Description

It is well known that ECR ion sources exhibit
instabilities when the source's minimum magnetic
field is approximately 80% of the resonant field or
greater, but the reasons for this instability have yet
to be satisfactorily explained. In this paper we
present a simple theoretical model that has the highminimum-
B instability as a consequence. We show
that this model predicts modes of operation with
high-minimum B that avoid that instability (including
multiple-frequency heating), and present results from
experimental tests of some of these predicted stable
modes.