Active fast ion charge exchange measurements using a neutral particle analyzer and multiple beam species in C-2W

Author:

Kamio S.12ORCID,Granstedt E. M.2ORCID,Clary R.2ORCID,Player G.12ORCID,Korepanov S.2,

Affiliation:

1. University of California Irvine, Irvine, California 92610, USA

2. TAE Technologies, Foothill Ranch, California 92697, USA

Abstract

In order to measure the fast ion using neutral particle analyzers (NPAs) in the low neutral density core region of a magnetic confinement fusion device, active change exchange measurements are often performed using a neutral beam (NB) as a charge-exchange (CX) target. One of the complications with this approach is that an NB injected as a CX target can also contribute to the total fast ion source. C-2W has a unique solution to this difficulty in that it is equipped with both eight NB injectors, which can inject beams of different particle species, and an electro-magnetic NPA (EM-NPA), which can measure multiple ion species simultaneously. This enables the active and passive fast ion CX components to be clearly distinguished. The decrease in amplitude of the CX spectra when a hydrogen NB is terminated was clearly observed by the EM-NPA in both hydrogen and deuterium channels. This reduction of observed fast ion flux was mainly caused by the diminished fast ion source, not crosstalk or a general reduction in fast ion confinement. As an example application of this technique on C-2W, fast ion behavior during a periodic density drop is explored. The large difference between the active and passive CX components of the EM-NPA signals clearly demonstrates the usefulness of the active fast ion CX measurement.

Publisher

AIP Publishing

Subject

Instrumentation

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