Y. Miura

Behavior of geodesic acoustic mode and limit-cycle oscillation approaching L-H transition in JFT-2M tokamak

T. Kobayashi, MAKOTO SASAKI, T. Ido, K. Kamiya et autres

Abstract In this paper, a phenomenology of competing behavior between the geodesic acoustic mode (GAM) and the limit-cycle oscillation (LCO) is presented. Before the LCO occurs, the GAM can grow to the observable amplitude via the turbulent Reynolds stress force. Approaching the …

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Practical Development of Accident Tolerant FeCrAl-ODS Fuel Claddings for BWRs in Japan

K. Sakamoto, Y. Miura, Hiroki Shibata, S. Asamoto et autres

Quantification of Turbulent Driving Forces for the Geodesic Acoustic Mode in the JFT-2M Tokamak

T. Kobayashi, MAKOTO SASAKI, T. Ido, K. Kamiya et autres

We investigate spatial structures of turbulence and turbulent transport modulated by the geodesic acoustic mode (GAM), from which the excitation mechanism of the GAM is discussed. The GAM is found to be predominantly excited through a localized Reynolds stress force, rather than …

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Turbulent transport reduction induced by transition on radial electric field shear and curvature through amplitude and cross-phase in torus plasma

T. Kobayashi, K. Itoh, T. Ido, K. Kamiya et autres

Spatiotemporal evolutions of radial electric field and turbulence are measured simultaneously in the H-mode transition, which is a prototypical example of turbulence structure formation in high-temperature plasmas. In the dynamical phase where transport barrier is established abruptly, the time-space-frequency-resolved turbulent particle flux …

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Model validation for radial electric field excitation during L–H transition in JFT-2M tokamak

T. Kobayashi, K. Itoh, T. Ido, K. Kamiya et autres

0000-0001-5669-1937

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Experimental Identification of Electric Field Excitation Mechanisms in a Structural Transition of Tokamak Plasmas

T. Kobayashi, K. Itoh, T. Ido, K. Kamiya et autres

Self-regulation between structure and turbulence, which is a fundamental process in the complex system, has been widely regarded as one of the central issues in modern physics. A typical example of that in magnetically confined plasmas is the Low confinement mode to …

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Edge plasma dynamics during L-H transition in the JFT-2M tokamak

T. Kobayashi, K. Itoh, T. Ido, K. Kamiya et autres

This article presents a radial electric field measurement by a heavy ion beam probe in the JFT-2M tokamak, during the L-H transition. An abrupt increase (time scale of O(100 µ s)) of the strong edge radial electric field (localized in the radius …

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Dynamics of edge limit cycle oscillation in the JFT-2M Tokamak

T. Kobayashi, K. Itoh, T. Ido, K. Kamiya et autres

Dynamics of edge limit cycle oscillation in the JFT-2M Tokamak, Kobayashi, T., Itoh, K., Ido, T., Kamiya, K., Itoh, S.-I., Miura, Y., Nagashima, Y., Fujisawa, A., Inagaki, S., Ida, K., Kasuya, N., Hoshino, K.

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Spatiotemporal Structures of Edge Limit-Cycle Oscillation before L-to-H Transition in the JFT-2M Tokamak

T. Kobayashi, K. Itoh, T. Ido, K. Kamiya et autres

In this Letter, we report analyses of spatiotemporal dynamics of turbulence and structure in the limit-cycle oscillation (LCO) that precedes an L-to-H transition. Zonal flows are not observed during LCO, and the oscillation is the periodic generations or decays of barrier with …

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Fast Potential Change at H-mode Transition on JFT-2M Tokamak Measured by a 500 keV HIBP

T. Ido, K. Kamiya, Yoshio Hamada, Akimitsu NISHIZAWA et autres

Boundary of the geodesic acoustic eigenmode in the vicinity of the magnetic separatrix

Yoshihiko Nagashima, K. Itoh, A. Fujisawa, K. Shinohara et autres

We present a detailed investigation of the geodesic acoustic eigenmode (GAEM) profile in the vicinity of the last closed flux surface (LCFS) in the JFT-2M tokamak. Envelope and spectral peak frequency of the GAEM vanish near the LCFS obtained by an equilibrium …

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Response of fusion gain to density in burning plasma simulation on JT-60U

H. Takenaga, H. Kubo, Michiharu Sueoka, Y. Kawamata et autres

A burning plasma simulation scheme has been developed with consideration for temperature dependence of the DT fusion reaction rate in JT-60U. The heating power for the simulation of alpha particle heating was calculated using real-time measurements of density and ion temperature. The …

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