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| P06 · Observation of CX Neutral Particle Flux Injected by Diagnostic Neutral Beam in CHS H. Matsushita1, K. Ida2, S. Okamura2, M. Isobe2, R. Akiyama2, CHS Group 1The Graduate University for Advanced Studies, Toki 509-5292, Japan
Abstract: Diagnostic neutral beam (DNB) is applied to study a confinement of energetic ion in the compact helical system (CHS). The DNB can vary the injection angle in order to study confinement of energetic ions with different pitch angle. A charge-exchange (CX) neutral particle analyzer (NPA) to measure energetic ions injected by the DNB is also scannable and varies the observation angle on the equatorial plane in CHS. Combination of horizontally scannable DNB and NPA provides the information on whether the energetic ions with different pitch angle are confined in the plasma or immediately lost. When DNB is injected at loss cone region, observed neutral flux is significantly decreased. The experimental results are consistent with the prediction of single particle full orbit calculation. The good confinement of helically trapped ions is expected in the configuration with strong inward shift in CHS. Experimental result shows better confinement of perpendicularly injected energetic ions in the inward shifted configuration compared with that in the outward shifted configuration.
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