Improvements in D− ion extraction in a multicusp ion source
- Mr. Anand Mathai GEORGE
- Mr. Anand Mathai GEORGE (D-Pace, University of Auckland)
D-Pace's multi-cusp ion source achieves high DC beam currents for negative hydrogen ions in both the TRIUMF licensed filament-powered ion source (~18mA) and the University of Jyväskylä licensed RF ion source (~8mA). However, the DC beam currents achieved from this source for negative deuterium ions is only 1/3 that of negative hydrogen ions. An earlier study  revealed that it is possible to extract more negative deuterium ions from the source by increasing the intensity of the magnetic dipole filter field in the plasma chamber, which enables the reduction of plasma electron density and electron temperature. In this paper, we investigate the effect of this increased field on the negative deuterium beam current achieved from the source and also the effect of adding an einzel lens for focusing of the beam.
 A. George, S. Melanson, D. Potkins, M. Dehnel, N. Broderick, H. McDonald and C. Philpott,"Optimisation of D− ion production in a multicusp ion source ," in Proc. 9th Int. Particle Accelerator Conf. (IPAC'18)[To be published]