Analysis techniques for diagnosing runaway ion distributions in the reversed field pinch

作者：Kim J^*; Anderson J K; Capecchi W; Bonofiglo P J; Sears S H

来源：Review of Scientific Instruments, 2016, 87(11): 11D819.

DOI：10.1063/1.4960422

An advanced neutral particle analyzer (ANPA) on the Madison Symmetric Torus measures deuterium ions of energy ranges 8-45 keV with an energy resolution of 2-4 keV and time resolution of 10 mu s. Three different experimental configurations measure distinct portions of the naturally occurring fast ion distributions: fast ions moving parallel, anti-parallel, or perpendicular to the plasma current. On a radial-facing port, fast ions moving perpendicular to the current have the necessary pitch to be measured by the ANPA. With the diagnostic positioned on a tangent line through the plasma core, a chord integration over fast ion density, background neutral density, and local appropriate pitch defines the measured sample. The plasma current can be reversed to measure anti-parallel fast ions in the same configuration. Comparisons of energy distributions for the three configurations show an anisotropic fast ion distribution favoring high pitch ions. Published by AIP Publishing.

• 出版日期2016-11