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Pace, D. C.*; Austin, M. E.*; Bass, E. M.*; Budny, R.*; Heidbrink, W. W.*; Hillesheim, J. C.*; Holcomb, C. T.*; Gorelenkova, M.*; Grierson, B. A.*; McCune, D. C.*; et al.
Physics of Plasmas, 20(5), p.056108_1 - 056108_18, 2013/05
Times Cited Count：33 Percentile：82.22(Physics, Fluids & Plasmas)Energetic ion transport due to microturbulence is investigated in MHD-quiescent plasmas by way of neutral beam injection in the DIII-D tokamak. A range of on-axis and off-axis beam injection scenarios are employed to vary relevant parameters such as the character of the background microturbulence and the value of Eb/Te, where Eb is the energetic ion energy and Te the electron temperature. In all cases it is found that any transport enhancement due to microturbulence is too small to observe experimentally. These transport effects are modeled using numerical and analytic expectations that calculate the energetic ion diffusivity due to microturbulence. It is determined that energetic ion transport due to coherent modes, including possible reductions in neutral beam current drive, is a considerably larger effect and should therefore be considered more important for ITER.
Hada, Kazuyoshi*; Nagasaki, Kazunobu*; Masuda, Kai*; Kinjo, Ryota*; Ide, Shunsuke; Isayama, Akihiko
no journal, ,
no abstracts in English
Kishimoto, Yasuaki; Sugiyama, Yuichi*; Iwata, Natsuyo*; Uchida, Tomoyuki*; Fukuda, Yuji
no journal, ,
Recently, signatures of high energy ion acceleration with 10-20 MeV per nucleon were observed in a clustered medium. A channeling over Rayleigh length was also detected. Here, we studied the characteristics of clustered medium irradiated by high power lasers using a particle based integrated code, EPIC3D, where key physical processes such as ionization, collisional relaxation, radiation damping, etc. are taken into account. The interaction is dominated not only by the averaged quantities, e.g. averaged cluster size and packing fraction, but also by their probabilistic configuration. The generation of high energy ions which range is the same order as the experiments was observed. We also study the propagation dynamics of laser regulated by the cluster expansion and associated complex density profile with high fluctuation level.
