TY - JOUR
T1 - Dynamics of edge limit cycle oscillation in the JFT-2M Tokamak
AU - Kobayashi, T.
AU - Itoh, K.
AU - Ido, T.
AU - Kamiya, K.
AU - Itoh, Sanae
AU - Miura, Y.
AU - Nagashima, Y.
AU - Fujisawa, A.
AU - Shigeru, Inagaki
AU - Ida, K.
AU - Kasuya, N.
AU - Hoshino, K.
N1 - Copyright:
Copyright 2014 Elsevier B.V., All rights reserved.
PY - 2014/7
Y1 - 2014/7
N2 - In the JFT-2M tokamak (JFT standing for JAERI Fusion Torus), the limit cycle oscillation (LCO), together with several variables, i.e., the electrostatic potential, radial electric field, electron density, turbulence intensity, and Dα emission from the divertor region, is observed before the L-to-H transition. The spatiotemporal dynamics of the LCO is analysed in detail. Zonal flows are not seen, while modulation is observed in the edge-localized poloidal flow and density gradient. Modulation is also seen in the Reynolds stress, caused by that in the turbulence intensity and turbulence wavenumber. However, flow acceleration cannot be explained by the modulation in the Reynolds stress. Rapid inward propagation is also observed for the density gradient and turbulence packet. The characteristics of the propagation are verified by means of turbulence spreading theory and diffusion theory.
AB - In the JFT-2M tokamak (JFT standing for JAERI Fusion Torus), the limit cycle oscillation (LCO), together with several variables, i.e., the electrostatic potential, radial electric field, electron density, turbulence intensity, and Dα emission from the divertor region, is observed before the L-to-H transition. The spatiotemporal dynamics of the LCO is analysed in detail. Zonal flows are not seen, while modulation is observed in the edge-localized poloidal flow and density gradient. Modulation is also seen in the Reynolds stress, caused by that in the turbulence intensity and turbulence wavenumber. However, flow acceleration cannot be explained by the modulation in the Reynolds stress. Rapid inward propagation is also observed for the density gradient and turbulence packet. The characteristics of the propagation are verified by means of turbulence spreading theory and diffusion theory.
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U2 - 10.1088/0029-5515/54/7/073017
DO - 10.1088/0029-5515/54/7/073017
M3 - Article
AN - SCOPUS:84901258277
SN - 0029-5515
VL - 54
JO - Nuclear Fusion
JF - Nuclear Fusion
IS - 7
M1 - 073017
ER -