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11 results on '"Yonenaga, R."'

4. High-speed imaging of edge plasma in the gamma 10 tandem mirror

Author

Nishino, N, Nakashima, Y, Takeda, H, Yonenaga, R, Hosoi, K, Ozawa, H, Ishii, T, Ichimura, M, Kariya, T, Katanuma, I, Minami, R, Miyata, Y, Yamaguchi, Y, Yoshikawa, M, and Imai, T

Subjects
Physics::Plasma Physics
Abstract

The dependence of the resonance position of the central-ECH (c-ECH) on plasma behavior was investigated using a fast camera. When the resonance positions were higher, low frequency fluctuation of∼6kHz was observed and at the same time the diamagnetic signal decreased. Also, the same frequency fluctuation was observed in the potential signal by Au beam probe. On the other hand this low frequency fluctuation was not appeared when the resonance position was seemed to be on the axis of the plasma. These results indicate that the convective ExB drift instabilities may be induced due to the off-axis heating by c-ECH.

Published
2016

5. Status and plan of GAMMA 10 tandem mirror program

Author

Imai, T, Ichimura, M, Nakashima, Y, Katanuma, I, Yoshikawa, M, Kariya, T, Minami, R, Miyata, Y, Yamaguchi, Y, Ikezoe, R, Shimozuma, T, Kubo, S, Yoshimura, Y, Takahashi, H, Mutoh, T, Sakamoto, K, Mizuguchi, M, Ota, M, Ozawa, H, Hosoi, K, Yaguchi, F, Yonenaga, R, Imai, Y, Murakani, T, and Yagi, K

Abstract

Recent progress and near future plan of GAMMA 10 efforts are presented. With high power plug electron cyclotron heating (ECH) up to ~ 400 kW, the ion confining potential of more than 2 kV was confirmed. The drift type low frequency fluctuations were suppressed by the positive radial electric field produced by plug ECH. It is found that the efficient EC heating on mirror devices from a strong B field side requires the minimization of the stray microwave in addition to the 100% X-mode excitation to avoid the enhancement of the ion loss. The development of a gyrotron, the key tool of these ECH experiments, has been made in collaboration with NIFS (National Institute for Fusion Science), More than 1.5 MWfor more than Is has been demonstrated at 77GHz. The plan of the boundary plasma research program with modification of GAMMA 10 is in progress. The new program includes the physics and technology studies of the divertor and SOL plasmas and PWI relevant to torus plasmas like ITER. The high heat flux experiments using the open end mirror throat has been started and we have obtained successful preliminary data, which include the heat flux of 8 MW/m2.

Published
2016

6. Edge Turbulence/Fluctuation Observation at “High Density Mode” in GAMMA 10 by Fast Camera

Author

Nishino, N., primary, Kawano, H., additional, Higashizono, Y., additional, Yonenaga, R., additional, Kigura, S., additional, Nakashima, Y., additional, Hosoi, K., additional, Ichimura, K., additional, Takeda, H., additional, Ueda, H., additional, Takahashi, S., additional, Ookawa, K., additional, Yoshikawa, M., additional, Ikezoe, R., additional, Kohagura, J., additional, Kariya, T., additional, Katanuma, I., additional, Hirata, M., additional, Numakura, T., additional, Minami, R., additional, Ichimura, M., additional, Sakamoto, M., additional, and Imai, T., additional

Published
2013
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7. Research Plan for Divertor Simulation Studies and Its Recent Results Using the GAMMA 10 Tandem Mirror

Author

Nakashima, Y., primary, Takeda, H., additional, Yonenaga, R., additional, Hosoi, K., additional, Ozawa, H., additional, Ishii, T., additional, Nishino, N., additional, Ichimura, M., additional, Kariya, T., additional, Katanuma, I., additional, Minami, R., additional, Miyata, Y., additional, Yamaguchi, Y., additional, Yoshikawa, M., additional, and Imai, T., additional

Published
2011
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8. Investigation of Plasma Behavior during the ECRH Injection in GAMMA 10

Author

Hosoi, K., primary, Nakashima, Y., additional, Kobayashi, S., additional, Higashizono, Y., additional, Ozawa, H., additional, Yonenaga, R., additional, Ishii, T., additional, Takeda, H., additional, Yamaguchi, Y., additional, Ichimura, M., additional, Ota, M., additional, Imai, Y., additional, murakami, T., additional, and Imai, T., additional

Published
2011
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9. High-Speed Imaging of Edge Plasma in the GAMMA 10 Tandem Mirror

Author

Nishino, N., primary, Nakashima, Y., additional, Takeda, H., additional, Yonenaga, R., additional, Hosoi, K., additional, Ozawa, H., additional, Ishii, T., additional, Ichimura, M., additional, Kariya, T., additional, Katanuma, I., additional, Minami, R., additional, Miyata, Y., additional, Yamaguchi, Y., additional, Yoshikawa, M., additional, and Imai, T., additional

Published
2011
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11. Status and Plan of GAMMA 10 Tandem Mirror Program

Author

Imai, T., Ichimura, M., Nakashima, Y., Katanuma, I., Yoshikawa, M., Kariya, T., Minami, R., Miyata, Y., Yamaguchi, Y., Ikezoe, R., Shimozuma, T., Kubo, S., Yoshimura, Y., Takahashi, H., Mutoh, T., Sakamoto, K., Mizuguchi, M., Ota, M., Ozawa, H., Hosoi, K., Yaguchi, F., Yonenaga, R., Imai, Y., Murakani, T., Yagi, K., Nakamura, T., Aoki1, H., Iizumi, H., Ishii, T., Kondou, H., Takeda, H., Ichioka, N., Masaki, S., and Yokoyama, T.

Abstract

AbstractRecent progress and near future plan of GAMMA 10 efforts are presented. With high power plug electron cyclotron heating (ECH)up to ~400 kW, the ion confining potential of more than 2 kV was confirmed. The drift type low frequency fluctuations were suppressed by the positive radial electric field produced by plug ECH. It is found that the efficient EC heating on mirror devices from a strong B field side requires the minimization of the stray microwave in addition to the 100% X-mode excitation to avoid the enhancement of the ion loss. The development of a gyrotron, the key tool of these ECH experiments, has been made in collaboration with NIFS (National Institute for Fusion Science), More than 1.5 MW for more than 1s has been demonstrated at 77GHz. The plan of the boundary plasma research program with modification of GAMMA 10 is in progress. The new program includes the physics and technology studies of the divertor and SOL plasmas and PWI relevant to torus plasmas like ITER. The high heat flux experiments using the open end mirror throat has been started and we have obtained successful preliminary data, which include the heat flux of 8 MW/m2.

Published
2011
Full Text
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