Plasma and Fusion Research
Volume 6, 2405086 (2011)
Regular Articles
- Department of Applied Quantum Physics and Nuclear Engineering, Kyushu University, 744 Motooka, Fukuoka 819-0395, Japan
- 1)
- Liberal Arts Education Center, Kumamoto Campus, Tokai University, 9-1-1 Toroku, Kumamoto 862-8652, Japan
- 2)
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki, 509-5292, Japan
Abstract
Alpha-particle slowing-down behaviors at low-temperature, high-density operation points in force-free helical reactors (FFHRs) are examined on the basis of a Fokker-Planck (FP) simulation that simultaneously consider the balance among generation, slowing down, and loss from the plasma in parallel with the density dependence of the Alfvén speed. An accurate treatment of the boundary velocity region between thermal and non-thermal components is shown to be important in evaluating the alpha particle population that can induce instability. In a typical high-density, low-temperature operation point in an FFHR, this population is reduced.
Keywords
alpha-particle velocity distribution function, Fokker-Planck equation, Alfvén eigenmode, MHD instability, force-free helical reactor (FFHR)
Full Text
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This paper may be cited as follows:
Hideaki MATSUURA, Osamu MITARAI, Akio SAGARA and Yasuyuki NAKAO, Plasma Fusion Res. 6, 2405086 (2011).