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Honda, Mitsuru; Takizuka, Tomonori; Fukuyama, Atsushi*; Ozeki, Takahisa
no journal, ,
One-dimensional transport code, TASK/TX, has been developed which can analyze the plasma rotation and the radial electric field self-consistently. The TASK/TX code solves the two-fluid equations in the quasi-toroidal coordinates coupled with Maxwell's equation, beam-ion slowing down equation and neutral diffusion equation by using the finite element method with a linear interpolation function. It is observed in JT-60U that due to the fast beam ion loss induced by the toroidal field ripple the plasma rotates in the counter direction near the peripheral even when the neutral beam is injected in the co direction. Numerical simulations including a ripple loss model have been done and the profiles observed in JT-60U are well reproduced. It is found by simulations that the ion toroidal flow profile is determined by not the direct loss of ripple trapped ions, but their transport.
Takizuka, Tomonori; Shimizu, Katsuhiro; Kawashima, Hisato
no journal, ,
no abstracts in English
Takizuka, Tomonori; Oyama, Naoyuki; Hosokawa, Masanari*
no journal, ,
no abstracts in English
Miyato, Naoaki; Kishimoto, Yasuaki; Li, J.*; Tokuda, Shinji
no journal, ,
Generation of zonal flow (ZF) and zonal magnetic field (ZMF) is investigated by global fluid simulations of electromagnetic ion temperature gradient (ITG) driven turbulence. It is known that the ZMFs are generated well at low order rational surfaces. In our specific cases the ZMFs are excited the most strongly at the q=2 surface, where q is the safety factor. The ZMFs are excited the most strongly at the q=1.5 surface in the case with only even toroidal modes. This is because even toroidal modes resonant at q=1.5 make the ZMF at the q=1.5 surface, while non-resonant odd modes damp the ZMF at q=1.5. On the other hand, since all modes are resonant at q=2, the ZMF at the q=2 surface does not change significantly by the coarse choice of toroidal modes. On ZF generation, the Reynolds stress mainly drives the ZFs and the geodesic transfer is a sink for the ZFs at low beta. It is found that the Reynolds stress and geodesic transfer contributions change sign at low order rational surfaces.
Ishii, Yasutomo; Smolyakov, A. I.*
no journal, ,
no abstracts in English
Ozeki, Takahisa
no journal, ,
no abstracts in English