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567 results on '"Tokuzawa, T."'

53. Development and application of radar reflectometer using micro to infrared waves

Author

Mase, A., primary, Kogi, Y., additional, Kuwahara, D., additional, Nagayama, Y., additional, Ito, N., additional, Maruyama, T., additional, Ikezi, H., additional, Wang, X., additional, Inutake, M., additional, Tokuzawa, T., additional, Kohagura, J., additional, Yoshikawa, M., additional, Shinohara, S., additional, Suzuki, A., additional, Sakai, F., additional, Yamashika, M., additional, Tobias, B. J., additional, Muscatello, C., additional, Ren, X., additional, Chen, M., additional, Domier, C. W., additional, and Luhmann, N. C., additional

Published
2018
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54. Progress of Experimental Study on Negative Hydrogen Ion Production and Extraction

Author

Kisaki M., Tsumori K., Ikeda K., Nakano H., Geng S., Tokuzawa T., Osakabe M., Nagaoka K., Agostinetti P., Brombin M., Hatayama A., Nishioka S., Sartori E., Serianni G., Veltri P., Kaneko O., and Takeiri Y.

Abstract

Development of the high performance negative hydrogen ion source is a fundamental demand in realizing fusion reactor. In order to clarify the extraction mechanism of H´, temporal and spatial variations of the negative ions and electrons in the extraction region are intensively surveyed at NIFS. In addition, the beam acceleration experiments have been performed by changing the accelerator configuration in order to improve the voltage holding capability and to study the negative ion beam optics. In a caesiated hydrogen plasma, it was observed that the negative hydrogen ion density (nH´) becomes one order higher in magnitude than the electron density (n e) in the vicinity of the plasma grid (PG). The response of negative-ion rich plasmas to the extraction field was investigated by measuring the plasma potential (V p) profiles in the axis perpendicular to the PG before and during beam extraction. The V p increases with applying the extraction field, and the influence of the extraction field on the V p was observed at 30 mm from the PG. As for the nH´, it was also observed that the extraction field affects on the nH´ at 30 mm from the PG, where the nH´ decreases simultaneously with the beam extraction. These observations indicate that the extraction field affects the particle dynamics in the wide region extending over 30 mm from the PG. This feature is completely different from that of electron-ion plasmas. We also found that the negative ion production efficiency becomes twice higher by changing the shape of grounded grid holes without any modification on the plasma chamber. We assumed that the behaviour of the back-streaming ion was affected by changing the GG. The back-streaming ion trajectory was analyzed with the beam trajectory simulation, and it was found that the back-streaming ion distributes in the larger area on the back plate with the slot GG. This implies that some part of condensed Cs on the back plate was more effectively evaporated by the back-streaming ion with the slot GG and that Cs flux onto the PG surface increased, which resulted in the enhancement of the negative ion production. This result suggests that the accelerator configuration is one of the key factors to determine the negative ion production efficiency and that the Cs consumption can be reduced by the Cs recycling from the wall of the ion source chamber.

Published
2016

55. Extension of the operational regime of the LHD towards a deuterium experiment

Author

Takeiri, Y., primary, Morisaki, T., additional, Osakabe, M., additional, Yokoyama, M., additional, Sakakibara, S., additional, Takahashi, H., additional, Nakamura, Y., additional, Oishi, T., additional, Motojima, G., additional, Murakami, S., additional, Ito, K., additional, Ejiri, A., additional, Imagawa, S., additional, Inagaki, S., additional, Isobe, M., additional, Kubo, S., additional, Masamune, S., additional, Mito, T., additional, Murakami, I., additional, Nagaoka, K., additional, Nagasaki, K., additional, Nishimura, K., additional, Sakamoto, M., additional, Sakamoto, R., additional, Shimozuma, T., additional, Shinohara, K., additional, Sugama, H., additional, Watanabe, K.Y., additional, Ahn, J.W., additional, Akata, N., additional, Akiyama, T., additional, Ashikawa, N., additional, Baldzuhn, J., additional, Bando, T., additional, Bernard, E., additional, Castejón, F., additional, Chikaraishi, H., additional, Emoto, M., additional, Evans, T., additional, Ezumi, N., additional, Fujii, K., additional, Funaba, H., additional, Goto, M., additional, Goto, T., additional, Gradic, D., additional, Gunsu, Y., additional, Hamaguchi, S., additional, Hasegawa, H., additional, Hayashi, Y., additional, Hidalgo, C., additional, Higashiguchi, T., additional, Hirooka, Y., additional, Hishinuma, Y., additional, Horiuchi, R., additional, Ichiguchi, K., additional, Ida, K., additional, Ido, T., additional, Igami, H., additional, Ikeda, K., additional, Ishiguro, S., additional, Ishizaki, R., additional, Ishizawa, A., additional, Ito, A., additional, Ito, Y., additional, Iwamoto, A., additional, Kamio, S., additional, Kamiya, K., additional, Kaneko, O., additional, Kanno, R., additional, Kasahara, H., additional, Kato, D., additional, Kato, T., additional, Kawahata, K., additional, Kawamura, G., additional, Kisaki, M., additional, Kitajima, S., additional, Ko, W.H., additional, Kobayashi, M., additional, Kobayashi, S., additional, Kobayashi, T., additional, Koga, K., additional, Kohyama, A., additional, Kumazawa, R., additional, Lee, J.H., additional, López-Bruna, D., additional, Makino, R., additional, Masuzaki, S., additional, Matsumoto, Y., additional, Matsuura, H., additional, Mitarai, O., additional, Miura, H., additional, Miyazawa, J., additional, Mizuguchi, N., additional, Moon, C., additional, Morita, S., additional, Moritaka, T., additional, Mukai, K., additional, Muroga, T., additional, Muto, S., additional, Mutoh, T., additional, Nagasaka, T., additional, Nagayama, Y., additional, Nakajima, N., additional, Nakanishi, H., additional, Nakano, H., additional, Nakata, M., additional, Narushima, Y., additional, Nishijima, D., additional, Nishimura, A., additional, Nishimura, S., additional, Nishitani, T., additional, Nishiura, M., additional, Nobuta, Y., additional, Noto, H., additional, Nunami, M., additional, Obana, T., additional, Ogawa, K., additional, Ohdachi, S., additional, Ohno, M., additional, Ohno, N., additional, Ohtani, H., additional, Okamoto, M., additional, Oya, Y., additional, Ozaki, T., additional, Peterson, B.J., additional, Preynas, M., additional, Sagara, S., additional, Saito, K., additional, Sakaue, H., additional, Sanpei, A., additional, Satake, S., additional, Sato, M., additional, Saze, T., additional, Schmitz, O., additional, Seki, R., additional, Seki, T., additional, Sharov, I., additional, Shimizu, A., additional, Shiratani, M., additional, Shoji, M., additional, Skinner, C., additional, Soga, R., additional, Stange, T., additional, Suzuki, C., additional, Suzuki, Y., additional, Takada, S., additional, Takahata, K., additional, Takayama, A., additional, Takayama, S., additional, Takemura, Y., additional, Takeuchi, Y., additional, Tamura, H., additional, Tamura, N., additional, Tanaka, H., additional, Tanaka, K., additional, Tanaka, M., additional, Tanaka, T., additional, Tanaka, Y., additional, Toda, S., additional, Todo, Y., additional, Toi, K., additional, Toida, M., additional, Tokitani, M., additional, Tokuzawa, T., additional, Tsuchiya, H., additional, Tsujimura, T., additional, Tsumori, K., additional, Usami, S., additional, Velasco, J.L., additional, Wang, H., additional, Watanabe, T.-H., additional, Watanabe, T., additional, Yagi, J., additional, Yajima, M., additional, Yamada, H., additional, Yamada, I., additional, Yamagishi, O., additional, Yamaguchi, N., additional, Yamamoto, Y., additional, Yanagi, N., additional, Yasuhara, R., additional, Yatsuka, E., additional, Yoshida, N., additional, Yoshinuma, M., additional, Yoshimura, S., additional, and Yoshimura, Y., additional

Published
2017
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56. Hysteresis and fast timescales in transport relations of toroidal plasmas

Author

Itoh, K., primary, Itoh, S.-I., additional, Ida, K., additional, Inagaki, S., additional, Kamada, Y., additional, Kamiya, K., additional, Dong, J.Q., additional, Hidalgo, C., additional, Evans, T., additional, Ko, W.H., additional, Park, H., additional, Tokuzawa, T., additional, Kubo, S., additional, Kobayashi, T., additional, Kosuga, Y., additional, Sasaki, M., additional, Yun, G.S., additional, Song, S.D., additional, Kasuya, N., additional, Nagashima, Y., additional, Moon, C., additional, Yoshinuma, M., additional, Makino, R., additional, Tsujimura, T., additional, Tsuchiya, H., additional, and Stroth, U., additional

Published
2017
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59. Flow damping due to stochastization of the magnetic field

Author

Ida, K., Yoshinuma, M., Tsuchiya, H., Kobayashi, T., Suzuki, C., Yokoyama, M., Shimizu, A., Nagaoka, K., Inagaki, S., Itoh, K., Akiyama, T., Goto, M., Goto, T., Hasuo, M., Hidalgo, C., Ichiguchi, K., Ishizawa, A., Jakubowski, M., Kamiya, K., Kasahara, H., Kawamura, G., Pablant, N., Kato, D., Kobayashi, M., Morita, S., Mukai, K., Murakami, I., Murakami, S., Narushima, Y., Nunami, M., Ohdach, S., Ohno, N., Sakakibara, S., Osakabe, M., Seki, T., Shimozuma, T., Shoji, M., Sudo, S., Tanaka, K., Tokuzawa, T., Todo, Y., Wang, H., Fujita, T., Yamada, H., Takeiri, Y., Mutoh, T., Imagawa, S., Mito, T., Nagayama, Y., Watanabe, K. Y., Ashikawa, N., Chikaraishi, H., Ejiri, A., Hamaguchi, S., Furukawa, M., Igami, H., Isobe, M., Masuzaki, S., Morisaki, T., Motojima, G., Nagasaki, K., Nakano, H., Oya, Y., Yamamoto, T., Suzuki, Y., Sakamoto, R., Sakamoto, M., Sanpei, A., Takahashi, H., Tokitani, M., Ueda, Y., Yoshimura, Y., Yamamoto, S., Nishimura, K., Idei, H., Sugama, H., Isayama, A., Kitajima, S., Masamune, S., Shinohara, K., Bawankar, P. S., Bernard, E., Von Berkel, M., Funaba, H., Nishimura, S., Huang, X. L., Ii, T., Ido, T., Ikeda, K., Kamio, S., Kumazawa, R., Moon, C., Muto, S., Miyazawa, J., Ming, T., Ogawa, K., Nakamura, Y., Ozaki, T., Oishi, T., Ohno, M., Pandya, S., Seki, R., Sano, R., Saito, K., Sakaue, H., Emoto, M., Takemura, Y., Tsumori, K., Tamura, N., Tanaka, H., Toi, K., Wieland, B., Yamada, I., Yasuhara, R., Zhang, H., Kaneko, O., Evans, T., Komori, A., Dinklage, A., Du, X., and Fujii, K.

Subjects
Physics::Fluid Dynamics, Physical sciences, Physics::Plasma Physics, Fluids and plasma physics, food and beverages, sense organs, equipment and supplies, human activities
Abstract

The driving and damping mechanism of plasma flow is an important issue because flow shear has a significant impact on turbulence in a plasma, which determines the transport in the magnetized plasma. Here we report clear evidence of the flow damping due to stochastization of the magnetic field. Abrupt damping of the toroidal flow associated with a transition from a nested magnetic flux surface to a stochastic magnetic field is observed when the magnetic shear at the rational surface decreases to 0.5 in the large helical device. This flow damping and resulting profile flattening are much stronger than expected from the Rechester-Rosenbluth model. The toroidal flow shear shows a linear decay, while the ion temperature gradient shows an exponential decay. This observation suggests that the flow damping is due to the change in the non-diffusive term of momentum transport.

Published
2015

60. Experimental study of particle transport and density fluctuations in LHD

Author

Tanaka, K, Michael, C, Sanin, AL, Vyacheslavov, LN, Kawahata, K, Murakami, S, Wakasa, A, Okajima, S, Yamada, H, Shoji, M, Miyazawa, J, Morita, S, Tokuzawa, T, Akiyama, T, Goto, M, Ida, K, Yoshinuma, M, Yamada, I, Yokoyama, M, Masuzaki, S, Morisaki, T, Sakamoto, R, Funaba, H, Inagaki, S, Kobayashi, M, and Komori, A

Published
2006

61. Spatial structure of low-frequency fluctuations throughout the transition of poloidal flow velocity in edge plasmas of LHD.

Author

Moon, C., Kobayashi, T., Ida, K., Tokuzawa, T., Hidalgo, C., Yoshinuma, M., Ogawa, K., Itoh, K., and Fujisawa, A.

Subjects
TRANSITION flow, FLOW velocity, PLASMA devices, PLASMA boundary layers, POLOIDAL magnetic fields
Abstract

It is observed that a low-frequency (∼2 kHz) density fluctuation is excited in a transition of the poloidal flow velocity (Vθ) in the edge magnetic stochastic region of the Large Helical Device plasmas. Furthermore, it is found that the propagation velocity becomes approximately zero in the proximity of the appearance region of the low-frequency fluctuation by using the edge multichannel microwave Doppler reflectometer system. In particular, the low-frequency fluctuation is considered to be transmitted in both directions (inward and outward) away from the excitation position of the fluctuation, which behaves as the precursor of a magnetic fluctuation burst. Afterward, the edge H α signal intensity is sharply increased. [ABSTRACT FROM AUTHOR]

Published
2019
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62. Compatibility between high energy particle confinement and magnetohydrodynamic stability in the inward-shifted plasmas of the Large Helical Device

Author

KANEKO, O., KOMORI, A., YAMADA, H., OHYABU, N., KAWAHATA, K., NAKAMURA, Y., IDA, K., MURAKAMI, S., MUTOH, T., SAKAKIBARA, S., Masuzaki, S., Ashikawa, N., Emoto, M., Funaba, H., Goto, M., Idei, H., Ikeda, K., Inagaki, S., Inoue, N., Isobe, M., Khlopenkov, K., Kubo, S., Kumazawa, R., Minami, T., Miyazawa, J., Morisaki, T., Morita, S., Muto, S., Nagayama, Y., Nakajima, N., Nakanishi, H., Narihara, K., Nishimura, K., Noda, N., Notake, T., Kobuchi, T., Liang, Y., Ohdachi, S., Oka, Y., Osakabe, M., Ozaki, T., Peterson, B. J., Sagara, A., Saito, K., Sakamoto, R., Sasao, M., Sato, K., Sato, M., Seki, T., SHIMOZUKA, T., SHOJI, M., Suzuki, H., Takechi, M., Takeiri, Y., Tamura, N., Tanaka, K., Toi, K., Tokuzawa, T., Torii, Y., Tsumori, K., Yamada, I., Yamamoto, S., Yokoyama, M., Yoshimura, Y., Yoshinuma, M., Watanabe, K.Y., Watari, T., Xu, Y., Itoh, K., Matsuoka, K., Ohkubo, K., Ohtake, I., Satow, T., Sudo, S., Yamazaki, K., Hamada, Y., Motojima, O., Fujiwara, M., O., Kaneko, A., KOMORI, H., YAMADA, N., Ohyabu, K., Kawahata, Y., Nakamura, K., Ida, S., Murakami, T., Mutoh, S., Sakakibara, S., Masuzaki, N., Ashikawa, M., Emoto, H., Funaba, M., Goto, H., Idei, K., Ikeda, S., Inagaki, N., Inoue, M., Isobe, K., Khlopenkov, S., Kubo, R., Kumazawa, T., Minami, J., Miyazawa, T., Morisaki, S., Morita, S., Muto, Y., Nagayama, N., Nakajima, H., Nakanishi, K., Narihara, K., Nishimura, N., Noda, T., Notake, T., Kobuchi, Y., Liang, S., Ohdachi, Y., Oka, M., Osakabe, T., Ozaki, B.J., Peterson, A., Sagara, K., Saito, R., Sakamoto, M., Sasao, K., Sato, M., Sato, T., Seki, T., Shimozuma, M., Shoji, H., Suzuki, M., Takechi, Y., Takeiri, N., Tamura, K., Tanaka, K., Toi, T., Tokuzawa, Y., Torii, K., Tsumori, I., Yamada, S., Yamamoto, M., Yokoyama, Y., Yoshimura, M., Yoshinuma, K.Y., Watanabe, T., Watari, Y., Xu, K., Itoh, K., Matsuoka, K., Ohkubo, I., Ohtake, T., Satow, S., Sudo, K., Yamazaki, Y., Hamada, O., Motojima, and M., Fujiwara

Subjects
Physics, High energy particle, Cyclotron, Plasma, Condensed Matter Physics, Neutral beam injection, Magnetic field, law.invention, Large Helical Device, law, Physics::Plasma Physics, Magnetohydrodynamic drive, Magnetohydrodynamics, Atomic physics
Abstract

The experimentally optimized magnetic field configuration of the Large Helical Device [A. Iiyoshi et al., Nucl. Fusion 39, 1245 (1999)], where the magnetic axis is shifted inward by 15 cm from the early theoretical prediction, reveals 50% better global energy confinement than the prediction of the scaling law. This configuration has been investigated further from the viewpoints of high energy particle confinement and magnetohydrodynamic (MHD) stability. The confinement of high energy ions is improved as expected. The minority heating of ion cyclotron range of frequency was successful and the heating efficiency was improved by the inward shift. The confinement of passing particles by neutral beam injection was also improved under low magnetic field strength, and there could be obtained an almost steady high beta discharge up to 3% in volume average. This was a surprising result because the observed pressure gradient exceeded the Mercier unstable limit. The observed MHD activities became as high as beta but they did not grow enough to deteriorate the confinement of high energy ions or the performance of the bulk plasma, which was still 50% better than the scaling. According to these favorable results, better performance would be expected by increasing the heating power because the neoclassical transport can also be improved there.

Published
2002

67. Progress of long pulse discharges by ECH in LHD

Author

Yoshimura, Y., primary, Kasahara, H., additional, Tokitani, M., additional, Sakamoto, R., additional, Ueda, Y., additional, Ito, S., additional, Okada, K., additional, Kubo, S., additional, Shimozuma, T., additional, Igami, H., additional, Takahashi, H., additional, Tsujimura, T.I., additional, Makino, R., additional, Kobayashi, S., additional, Mizuno, Y., additional, Akiyama, T., additional, Ashikawa, N., additional, Masuzaki, S., additional, Motojima, G., additional, Shoji, M., additional, Suzuki, C., additional, Tanaka, H., additional, Tanaka, K., additional, Tokuzawa, T., additional, Tsuchiya, H., additional, Yamada, I., additional, Goto, Y., additional, Yamada, H., additional, Mutoh, T., additional, Komori, A., additional, and Takeiri, Y., additional

Published
2016
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70. Physics-based Investigation of Negative Ion Behavior in a Negative-ion-rich Plasma using Integrated Diagnostics.

Author

Tsumori, K., Takeiri, Y., Ikeda, K., Nakano, H., Geng, S., Kisaki, M., Nagaoka, K., Tokuzawa, T., Wada, M., Sasaki, K., Nishiyama, S., Goto, M., and Osakabe, M.

Subjects
ANIONS, PLASMA instabilities, PLASMA beam injection heating, HYDROGEN ions, EXTRACTION (Chemistry)
Abstract

Total power of 16 MW has been successfully delivered to the plasma confined in the Large Helical Device (LHD) from three Neutral Beam Injectors (NBIs) equipped with negative hydrogen (H-) ion sources. However, the detailed mechanisms from production through extraction of H- ions are still yet to be clarified and a similar size ion source on an independent acceleration test bench called Research and development Negative Ion Source (RNIS) serves as the facility to study physics related to H- production and transport for further improvement of NBI. The production of negative-ion-rich plasma and the H- ions behavior in the beam extraction region in RNIS is being investigated by employing an integrated diagnostic system. Flow patterns of electrons, positive ions and H- ions in the extraction region are described in a two-dimensional map. The measured flow patterns indicate the existence a stagnation region, where the H- flow changes the direction at a distance about 20 mm from the plasma grid. The pattern also suggested the H- flow originated from plasma grid (PG) surface that turned back toward extraction apertures. The turning region seems formed by a layer of combined magnetic field produced by the magnetic filter field and the Electron-Deflection Magnetic (EDM) field created by magnets installed in the extraction electrode. [ABSTRACT FROM AUTHOR]

Published
2017
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72. Observation of distorted Maxwell-Boltzmann distribution of epithermal ions in LHD.

Author

Ida, K., Kobayashi, T., Yoshinuma, M., Akiyama, T., Tokuzawa, T., Tsuchiya, H., and Itoh, K.

Subjects
ION energy, MAGNETIC flux, FORCE & energy, MAGNETIC fields, SPECTRUM analysis
Abstract

A distorted Maxwell-Boltzmann distribution of epithermal ions is observed associated with the collapse of energetic ions triggered by the tongue shaped deformation. The tongue shaped deformation is characterized by the plasma displacement localized in the toroidal, poloidal, and radial directions at the non-rational magnetic flux surface in toroidal plasma. Moment analysis of the ion velocity distribution measured with charge exchange spectroscopy is studied in order to investigate the impact of tongue event on ion distribution. A clear non-zero skewness (3rd moment) and kurtosis (4th moment -3) of ion velocity distribution in the epithermal region (within three times of thermal velocity) is observed after the tongue event. This observation indicates the clear evidence of the distortion of ion velocity distribution from Maxwell-Boltzmann distribution. This distortion from Maxwell-Boltzmann distribution is observed in one-third of plasma minor radius region near the plasma edge and disappears in the ion-ion collision time scale. [ABSTRACT FROM AUTHOR]

Published
2017
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73. Characteristics of MHD instabilities limiting the beta value in LHD

Author

Sakakibara, S., primary, Watanabe, K.Y., additional, Takemura, Y., additional, Okamoto, M., additional, Ohdachi, S., additional, Suzuki, Y., additional, Narushima, Y., additional, Ida, K., additional, Yoshinuma, M., additional, Tanaka, K., additional, Tokuzawa, T., additional, Yamada, I., additional, Yamada, H., additional, and Takeiri, Y., additional

Published
2015
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74. Research progress on ionic plasmas generated in an intense hydrogen negative ion source

Author

Takeiri, Y., primary, Tsumori, K., additional, Ikeda, K., additional, Nakano, H., additional, Kisaki, M., additional, Nagaoka, K., additional, Tokuzawa, T., additional, Geng, S., additional, Osakabe, M., additional, Kaneko, O., additional, Kondo, T., additional, Sato, M., additional, Shibuya, M., additional, Komada, S., additional, and Sekiguchi, H., additional

Published
2015
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77. Overview of transport and MHD stability study: focusing on the impact of magnetic field topology in the Large Helical Device

Author

Ida, K., Nagaoka, K., Inagaki, S., Kasahara, H., Evans, T., Yoshinuma, M., Kamiya, K., Ohdach, S., Osakabe, M., Kobayashi, M., Sudo, S., Itoh, K., Akiyama, T., Emoto, M., Dinklage, A., Du, X., Fujii, K., Goto, M., Goto, T., Hasuo, M., Hidalgo, C., Ichiguchi, K., Ishizawa, A., Jakubowski, M., Kawamura, G., Kato, D., Morita, S., Mukai, K., Murakami, I., Murakami, S., Narushima, Y., Nunami, M., Ohno, N., Pablant, N., Sakakibara, S., Seki, T., Shimozuma, T., Shoji, M., Tanaka, K., Tokuzawa, T., Todo, Y., Wang, H., Yokoyama, M., Yamada, H., Takeiri, Y., Mutoh, T., Imagawa, S., Mito, T., Nagayama, Y., Watanabe, K.Y., Ashikawa, N., Chikaraishi, H., Ejiri, A., Furukawa, M., Fujita, T., Hamaguchi, S., Igami, H., Isobe, M., Masuzaki, S., Morisaki, T., Motojima, G., Nagasaki, K., Nakano, H., Oya, Y., Suzuki, C., Suzuki, Y., Sakamoto, R., Sakamoto, M., Sanpei, A., Takahashi, H., Tsuchiya, H., Tokitani, M., Ueda, Y., Yoshimura, Y., Yamamoto, S., Nishimura, K., Sugama, H., Yamamoto, T., Idei, H., Isayama, A., Kitajima, S., Masamune, S., Shinohara, K., Bawankar, P.S., Bernard, E., von Berkel, M., Funaba, H., Huang, X.L., Ii, T., Ido, T., Ikeda, K., Kamio, S., Kumazawa, R., Kobayashi, T., Moon, C., Muto, S., Miyazawa, J., Ming, T., Nakamura, Y., Nishimura, S., Ogawa, K., Ozaki, T., Oishi, T., Ohno, M., Pandya, S., Shimizu, A., Seki, R., Sano, R., Saito, K., Sakaue, H., Takemura, Y., Tsumori, K., Tamura, N., Tanaka, H., Toi, K., Wieland, B., Yamada, I., Yasuhara, R., Zhang, H., Kaneko, O., Komori, A., and Collaborators

Subjects
Nuclear and High Energy Physics, Electron density, topology, Materials science, Plasma, Electron, Condensed Matter Physics, Topology, 7. Clean energy, 01 natural sciences, 010305 fluids & plasmas, Ion, Magnetic field, Momentum, Large Helical Device, transport, 0103 physical sciences, Atomic physics, Magnetohydrodynamics, 010306 general physics, helical
Abstract

The progress in the understanding of the physics and the concurrent parameter extension in the large helical device since the last IAEA-FEC, in 2012 (Kaneko O et al 2013 Nucl. Fusion 53 095024), is reviewed. Plasma with high ion and electron temperatures (Ti(0) ~ Te(0) ~ 6 keV) with simultaneous ion and electron internal transport barriers is obtained by controlling recycling and heating deposition. A sign flip of the nondiffusive term of impurity/momentum transport (residual stress and convection flow) is observed, which is associated with the formation of a transport barrier. The impact of the topology of three-dimensional magnetic fields (stochastic magnetic fields and magnetic islands) on heat momentum, particle/impurity transport and magnetohydrodynamic stability is also discussed. In the steady state operation, a 48 min discharge with a line-averaged electron density of 1 × 1019 m−3 and with high electron and ion temperatures (Ti(0) ~ Te(0) ~ 2 keV), resulting in 3.36 GJ of input energy, is achieved.

Published
2015

78. Recent progress in Large Helical Device experiments

Author

Komori, A., Morisaki, T., Mutoh, T., Sakakibara, S., Takeiri, Y., Kumazawa, R., Kubo, S., Ida, K., Morita, S., Narihara, K., Shimozuma, T., Tanaka, K., Watanabe, K., Yamada, H., Yoshinuma, M., Akiyama, T., Ashikawa, N., Beidler, C., Emoto, M., Fujita, T., Funaba, H., Goncharov, P., Goto, M., Ido, T., Ikeda, K., Inagaki, S., Isayama, A., Isobe, M., Igami, H., Ishii, K., Itoh, K., Kaneko, O., Kawahata, K., Kawazome, H., Kobuchi, T., Masuzaki, S., Matsuoka, K., Minami, T., Miyazawa, J., Murakami, S., Muto, S., Nagayama, Y., Nakamura, Y., Nakanishi, H., Narushima, Y., Nishimura, K., Nishiura, M., Nishizawa, A., Noda, N., Notake, T., Ohdachi, S., Oka, Y., Okajima, S., Osakabe, M., Ohyabu, N., Ozaki, T., Peterson, B., Sagara, A., Saito, K., Sakamoto, M., Sakamoto, R., Sakamoto, Y., Sasao, M., Sato, K., Seki, T., Shoji, M., Sudo, S., Takeuchi, N., Takenaga, H., Tamura, N., Toi, K., Tokuzawa, T., Torii, Y., Tsumori, K., Uda, T., Watari, T., Yamada, I., Yokoyama, M., Yoshimura, Y., Motojima, O., and LHD Experimental Group

Published
2006

79. Recent progress on confinement improvement study and ion heating experiments in LHD

Author

Morita, S., Goto, M., Morisaki, T., Takeiri, Y., Tanaka, K., Masuzaki, S., Miyazawa, J., Murakami, S., Muto, S., Mutoh, T., Narihara, K., Nozato, H., M.Osakabe, M., Sakakibara, S., Sakamoto, R., Yamazaki, K., Yokoyama, M., Ashikawa, N., Funaba, H., Ida, K., Ikeda, K., Inagaki, S., Kaneko, O., Kawahata, K., Kubo, S., Kumazawa, R., Nagaoka, K., Nagayama, Y., Nakamura, Y., Narushima, Y., Nishimura, K., Ohdachi, S., Ohkubo, K., Ohyabu, N., Oka, Y., Ozaki, T., Peterson, B.J., Saito, K., Sato, K., Seki, T., Shzuma, T., Shoji, M., Tamura, N., Toi, K., Tokuzawa, T., Tsumori, K., Watanabe, K.Y., Watari, T., Yamada, H., Yamada, I., Yoshimura, Y., Yoshinuma, M., Komori, A., and Motojima, O.

Subjects
Magnetic confinement
Abstract

Experimental efforts have been extensively done in Large Helical Device (LHD) to find the key for confinement improvement like H-mode and ITB seen in tokamaks. In outwardly shifted configuration (Rax=4.00m) having an m/n=1/1 rational surface at the ergodic layer an H-mode-like transition was obtained with rapid density rise and appearance of ELM-like Hα bursts, when the PNBI was decreased from 8 to 5MW. A density window of 4-8x10¹³cm⁻³ existed for the H-mode-like transition. The ELM-like Hα bursts may be drived by a pressure gradient at the 1/1 position. On the other hand, Ne and Ar discharges were adopted to increase the ion heating power per ion and to perform the density peaking. As a result, high ion temperatures up to 10keV were obtained with a large enhancement of toroidal rotation (~40km/s). A clear reduction of the ion thermal diffusivity was found in the Ar discharge with large toroidal rotations in comparison with the Ne discharge with a small toroidal rotation (

Published
2005

80. Extension and its characteristics of ECRH plasma in the LHD

Author

Kubo, Shin, Shimozuma, T., Yoshimura, Y., Notake, T., Idei, H., Inagaki, S., Yokoyama, M., Ohkubo, K., Kumazawa, R., Nakamura, Y., Saito, K., Seki, T., Mutoh, T., Watari, T., Narihara, K., Yamada, I., Ida, K., Takeiri, Y., Funaba, H., Ohyabu, N., Kawahata, K., Kaneko, O., Yamada, H., Itoh, K., Ashikawa, N., Emoto, M., Goto, M., Hamada, Y., Ido, T., Ikeda, K., Isobe, M., Khlopenkov, K., Kobuchi, T., Masuzaki, S., Minami, T., Miyazawa, J., Morisaki, T., Morita, S., Murakami, S., Muto, S., Nagaoka, K., Nagayama, Y., Nakanishi, H., Narushima, Y., Nishimura, K., Nishiura, M., Noda, N., Ohdachi, S., Oka, Y., Osakabe, M., Ozaki, T., J. Peterson, B., Sagara, A., Sakakibara, S., Sakamoto, R., Shoji, M., Sudo, S., Takeuchi, N., Tamura, N., Tanaka, K., Toi, K., Tokuzawa, T., Tsumori, K., Watanabe, K., Watanabe, T., Yamazaki, K., Yoshinuma, M., Komori, A., Motojima, O., National Institute for Fusion Science (NIFS), Advanced Fusion Research Center, Kyushu University [Fukuoka]-Research Institute for Applied Mechanics, Department of Nuclear Engineering, and Kyoto University [Kyoto]-Faculty of Engineering

Subjects
Plasma Physics (physics.plasm-ph), [PHYS.PHYS.PHYS-PLASM-PH]Physics [physics]/Physics [physics]/Plasma Physics [physics.plasm-ph], Physics::Plasma Physics, FOS: Physical sciences, Physics - Plasma Physics
Abstract

One of the main objectives of the LHD is to extend the plasma confinement database for helical systems and to demonstrate such extended plasma confinement properties to be sustained in steady state. Among the various plasma parameter regimes, the study of confinement properties in the collisionless regime is of particular importance. Electron cyclotron resonance heating (ECRH) has been extensively used for these confinement studies of the LHD plasma from the initial operation. The system optimizations including the modification of the transmission and antenna system are performed with the special emphasis on the local heating properties. As the result, central electron temperature of more than 10 keV with the electron density of 0.6 x 10$^{19}$ m$^{-3}$ is achieved near the magnetic axis. The electron temperature profile is characterized by a steep gradient similar to those of an internal transport barrier observed in tokamaks and stellarators. 168 GHz ECRH system demonstrated efficient heating at over the density more than 1.0 x 10$^{20}$ m$^{-3}$. CW ECRH system is successfully operated to sustain 756 s discharge., 12th International Congress on Plasma Physics, 25-29 October 2004, Nice (France)

Published
2004

81. Quasilinear carbon transport in an impurity hole plasma in LHD

Author

Mikkelsen, D. R., primary, Tanaka, K., additional, Nunami, M., additional, Watanabe, T.-H., additional, Sugama, H., additional, Yoshinuma, M., additional, Ida, K., additional, Suzuki, Y., additional, Goto, M., additional, Morita, S., additional, Wieland, B., additional, Yamada, I., additional, Yasuhara, R., additional, Tokuzawa, T., additional, Akiyama, T., additional, and Pablant, N. A., additional

Published
2014
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85. Reflectometric measurement of plasma imaging and applications

Author

Mase, A., Ito, N., Oda, M., Komada, Y., Nagae, D., Zhang, D., Kogi, Y., Tobimatsu, S., Maruyama, T., Shimazu, H., Sakata, E., Sakai, F., Kuwahara, D., Yoshinaga, T., Tokuzawa, T., Nagayama, Y., Kawahata, K., Yamaguchi, S., Tsuji-lio, S., Domier, C.W., Luhmann, N.C., Park, H.K., Yun, G., Lee, W., Padhi, Shantanu, Kim, K.W., Mase, A., Ito, N., Oda, M., Komada, Y., Nagae, D., Zhang, D., Kogi, Y., Tobimatsu, S., Maruyama, T., Shimazu, H., Sakata, E., Sakai, F., Kuwahara, D., Yoshinaga, T., Tokuzawa, T., Nagayama, Y., Kawahata, K., Yamaguchi, S., Tsuji-lio, S., Domier, C.W., Luhmann, N.C., Park, H.K., Yun, G., Lee, W., Padhi, Shantanu, and Kim, K.W.

Abstract

Progress in microwave and millimeter-wave technologies has made possible advanced diagnostics for application to various fields, such as, plasma diagnostics, radio astronomy, alien substance detection, airborne and spaceborne imaging radars called as synthetic aperture radars, living body measurements. Transmission, reflection, scattering, and radiation processes of electromagnetic waves are utilized as diagnostic tools. In this report we focus on the reflectometric measurements and applications to biological signals (vital signal detection and breast cancer detection) as well as plasma diagnostics, specifically by use of imaging technique and ultra-wideband radar technique.

Published
2012

86. Polarized Radiative Transfer of Electron Cyclotron Wave in LHD

Author

Idei, H., Kubo, S., Shimozuma, T., Tsumori, K., Takita, Y., Kobayashi, S., Ito, S., Mizuno, Y., Sato, M., Ohkubo, K., Yoshimura, Y., Leuterer, F., Notake, T., Watari, T., De Vries, P., Emoto, M., Funaba, H., Goto, M., Ida, K., Ikeda, K., Inagaki, S., Kado, S., Kobuchi, T., Kumazawa, R., Masuzaki, S., Minami, T., Miyazawa, J., Morisaki, T., Morita, S., Murakami, S., Muto, S., Mutoh, T., Nagayama, Y., Nakamura, Y., Nakanishi, H., Narihara, K., Nishimura, K., Noda, N., Ohdachi, S., Oka, Y., Osakabe, M., Ozaki, T., Peterson, B., Saito, K., Sagara, A., Sakakibara, S., Sakamoto, R., Sasao, H., Sasao, M., Sato, K., Seki, T., Shoji, M., Suzuki, H., Takechi, M., Takeiri, Y., Tanaka, K., Toi, K., Tokuzawa, T., Torii, Y., Watanabe, K., Yamada, I., Yamaguchi, S., Yamamoto, S., Yamazaki, K., Yokoyama, M., Kaneko, O., Kawahata, K., Komori, A., Ohyabu, N., Yamada, H., Motojima, O., and LHD Experimental Group

Published
2000

87. Observation of Reversed-Shear Alfven Eigenmodes Excited by Energetic Ions in a Helical Plasma

Author

Toi, K., Watanabe, F., Tokuzawa, T., Ida, K., Morita, S., Ido, T., Shimizu, A., Isobe, M., Ogawa, K., Spong, D. A., Todo, Y., Watari, T., Ohdachi, S., Sakakibara, S., Yamamoto, S., Inagaki, S., Narihara, K., Osakabe, M., Nagaoka, K., Narushima, Y., Watanabe, K. Y., Funaba, H., Goto, M., Ikeda, K., Ito, T., Kaneko, O., Kubo, S., Murakami, S., Minami, T., Miyazawa, J., Nagayama, Y., Nishiura, M., Oka, Y., Sakamoto, R., Shimozuma, T., Takeiri, Y., Tanaka, K., Tsumori, K., Yamada, I., Yoshinuma, M., Kawahata, K., Komori, A., Toi, K., Watanabe, F., Tokuzawa, T., Ida, K., Morita, S., Ido, T., Shimizu, A., Isobe, M., Ogawa, K., Spong, D. A., Todo, Y., Watari, T., Ohdachi, S., Sakakibara, S., Yamamoto, S., Inagaki, S., Narihara, K., Osakabe, M., Nagaoka, K., Narushima, Y., Watanabe, K. Y., Funaba, H., Goto, M., Ikeda, K., Ito, T., Kaneko, O., Kubo, S., Murakami, S., Minami, T., Miyazawa, J., Nagayama, Y., Nishiura, M., Oka, Y., Sakamoto, R., Shimozuma, T., Takeiri, Y., Tanaka, K., Tsumori, K., Yamada, I., Yoshinuma, M., Kawahata, K., and Komori, A.

Published
2010

88. PARTICLE TRANSPORT OF LHD

Author

Tanaka, K., Kawahata, K., Tokuzawa, T., Akiyama, T., Yokoyama, M., Shoji, M., Michael, C. A., Vyacheslavov, L. N., Murakami, S., Wakasa, A., Mishchenko, A., Muraoka, K., Okajima, S., Takenaga, H., Tanaka, K., Kawahata, K., Tokuzawa, T., Akiyama, T., Yokoyama, M., Shoji, M., Michael, C. A., Vyacheslavov, L. N., Murakami, S., Wakasa, A., Mishchenko, A., Muraoka, K., Okajima, S., and Takenaga, H.

Published
2010

89. FAST-ION CONFINEMENT STUDIES ON LHD

Author

Osakabe, M., Isobe, M., Murakami, S., Kobayashi, S., Saito, K., Kumazawa, R., Mutoh, T., Ozaki, T., Nishiura, M., Veshchev, E., Seki, T., Takeiri, Y., Kaneko, O., Nagaoka, K., Tokuzawa, T., Ogawa, K., Toi, K., Yamamoto, S., Sasao, M., Watanabe, T., Osakabe, M., Isobe, M., Murakami, S., Kobayashi, S., Saito, K., Kumazawa, R., Mutoh, T., Ozaki, T., Nishiura, M., Veshchev, E., Seki, T., Takeiri, Y., Kaneko, O., Nagaoka, K., Tokuzawa, T., Ogawa, K., Toi, K., Yamamoto, S., Sasao, M., and Watanabe, T.

Published
2010

90. LOCAL TRANSPORT PROPERTY OF HIGH-BETA PLASMAS ON LHD

Author

Funaba, H., Watanabe, K. Y., Sakakibara, S., Murakami, S., Yamada, I., Narihara, K., Tanaka, K., Tokuzawa, T., Osakabe, M., Narushima, Y., Yokoyama, M., Ohdachi, S., Takeiri, Y., Yamada, H., Kawahata, K., Funaba, H., Watanabe, K. Y., Sakakibara, S., Murakami, S., Yamada, I., Narihara, K., Tanaka, K., Tokuzawa, T., Osakabe, M., Narushima, Y., Yokoyama, M., Ohdachi, S., Takeiri, Y., Yamada, H., and Kawahata, K.

Published
2010

91. IMPROVEMENT OF PLASMA CORE CONFINEMENT VIA ELECTRON-ROOT REALIZATION BY STRONGLY FOCUSED ECRH IN LHD: CORE ELECTRON-ROOT CONFINEMENT

Author

Shimozuma, T., Yokoyama, M., Ida, K., Takeiri, Y., Kubo, S., Murakami, S., Wakasa, A., Idei, H., Yoshimura, Y., Notake, T., Inagaki, S., Tamura, N., Toi, K., Ohyabu, N., Osakabe, M., Ikeda, K., Tsumori, K., Oka, Y., Nagaoka, K., Kaneko, O., Yamada, I., Narihara, K., Nagayama, Y., Muto, S., Tanaka, K., Tokuzawa, T., Morita, S., Goto, M., Yoshinuma, M., Funaba, H., Morisaki, T., Watanabe, K. Y., Miyazawa, J., Mutoh, T., Watari, T., Ohkubo, K., Shimozuma, T., Yokoyama, M., Ida, K., Takeiri, Y., Kubo, S., Murakami, S., Wakasa, A., Idei, H., Yoshimura, Y., Notake, T., Inagaki, S., Tamura, N., Toi, K., Ohyabu, N., Osakabe, M., Ikeda, K., Tsumori, K., Oka, Y., Nagaoka, K., Kaneko, O., Yamada, I., Narihara, K., Nagayama, Y., Muto, S., Tanaka, K., Tokuzawa, T., Morita, S., Goto, M., Yoshinuma, M., Funaba, H., Morisaki, T., Watanabe, K. Y., Miyazawa, J., Mutoh, T., Watari, T., and Ohkubo, K.

Published
2010

92. Observation of Reversed-Shear Alfven Eigenmodes Excited by Energetic Ions in a Helical Plasma

Author

40249967, Toi, K., Watanabe, F., Tokuzawa, T., Ida, K., Morita, S., Ido, T., Shimizu, A., Isobe, M., Ogawa, K., Spong, D. A., Todo, Y., Watari, T., Ohdachi, S., Sakakibara, S., Yamamoto, S., Inagaki, S., Narihara, K., Osakabe, M., Nagaoka, K., Narushima, Y., Watanabe, K. Y., Funaba, H., Goto, M., Ikeda, K., Ito, T., Kaneko, O., Kubo, S., Murakami, S., Minami, T., Miyazawa, J., Nagayama, Y., Nishiura, M., Oka, Y., Sakamoto, R., Shimozuma, T., Takeiri, Y., Tanaka, K., Tsumori, K., Yamada, I., Yoshinuma, M., Kawahata, K., Komori, A., 40249967, Toi, K., Watanabe, F., Tokuzawa, T., Ida, K., Morita, S., Ido, T., Shimizu, A., Isobe, M., Ogawa, K., Spong, D. A., Todo, Y., Watari, T., Ohdachi, S., Sakakibara, S., Yamamoto, S., Inagaki, S., Narihara, K., Osakabe, M., Nagaoka, K., Narushima, Y., Watanabe, K. Y., Funaba, H., Goto, M., Ikeda, K., Ito, T., Kaneko, O., Kubo, S., Murakami, S., Minami, T., Miyazawa, J., Nagayama, Y., Nishiura, M., Oka, Y., Sakamoto, R., Shimozuma, T., Takeiri, Y., Tanaka, K., Tsumori, K., Yamada, I., Yoshinuma, M., Kawahata, K., and Komori, A.

Abstract

Reversed-shear Alfvén eigenmodes were observed for the first time in a helical plasma having negative q0'' (the curvature of the safety factor q at the zero shear layer). The frequency is swept downward and upward sequentially via the time variation in the maximum of q. The eigenmodes calculated by ideal MHD theory are consistent with the experimental data. The frequency sweeping is mainly determined by the effects of energetic ions and the bulk pressure gradient. Coupling of reversed-shear Alfvén eigenmodes with energetic ion driven geodesic acoustic modes generates a multitude of frequency-sweeping modes.

Published
2010

93. IMPROVEMENT OF PLASMA CORE CONFINEMENT VIA ELECTRON-ROOT REALIZATION BY STRONGLY FOCUSED ECRH IN LHD: CORE ELECTRON-ROOT CONFINEMENT

Author

40249967, Shimozuma, T., Yokoyama, M., Ida, K., Takeiri, Y., Kubo, S., Murakami, S., Wakasa, A., Idei, H., Yoshimura, Y., Notake, T., Inagaki, S., Tamura, N., Toi, K., Ohyabu, N., Osakabe, M., Ikeda, K., Tsumori, K., Oka, Y., Nagaoka, K., Kaneko, O., Yamada, I., Narihara, K., Nagayama, Y., Muto, S., Tanaka, K., Tokuzawa, T., Morita, S., Goto, M., Yoshinuma, M., Funaba, H., Morisaki, T., Watanabe, K. Y., Miyazawa, J., Mutoh, T., Watari, T., Ohkubo, K., 40249967, Shimozuma, T., Yokoyama, M., Ida, K., Takeiri, Y., Kubo, S., Murakami, S., Wakasa, A., Idei, H., Yoshimura, Y., Notake, T., Inagaki, S., Tamura, N., Toi, K., Ohyabu, N., Osakabe, M., Ikeda, K., Tsumori, K., Oka, Y., Nagaoka, K., Kaneko, O., Yamada, I., Narihara, K., Nagayama, Y., Muto, S., Tanaka, K., Tokuzawa, T., Morita, S., Goto, M., Yoshinuma, M., Funaba, H., Morisaki, T., Watanabe, K. Y., Miyazawa, J., Mutoh, T., Watari, T., and Ohkubo, K.

Published
2010

94. Observation of Reversed-Shear Alfven Eigenmodes Excited by Energetic Ions in a Helical Plasma

Author

70397529, Toi, K., Watanabe, F., Tokuzawa, T., Ida, K., Morita, S., Ido, T., Shimizu, A., Isobe, M., Ogawa, K., Spong, D. A., Todo, Y., Watari, T., Ohdachi, S., Sakakibara, S., Yamamoto, S., Inagaki, S., Narihara, K., Osakabe, M., Nagaoka, K., Narushima, Y., Watanabe, K. Y., Funaba, H., Goto, M., Ikeda, K., Ito, T., Kaneko, O., Kubo, S., Murakami, S., Minami, T., Miyazawa, J., Nagayama, Y., Nishiura, M., Oka, Y., Sakamoto, R., Shimozuma, T., Takeiri, Y., Tanaka, K., Tsumori, K., Yamada, I., Yoshinuma, M., Kawahata, K., Komori, A., 70397529, Toi, K., Watanabe, F., Tokuzawa, T., Ida, K., Morita, S., Ido, T., Shimizu, A., Isobe, M., Ogawa, K., Spong, D. A., Todo, Y., Watari, T., Ohdachi, S., Sakakibara, S., Yamamoto, S., Inagaki, S., Narihara, K., Osakabe, M., Nagaoka, K., Narushima, Y., Watanabe, K. Y., Funaba, H., Goto, M., Ikeda, K., Ito, T., Kaneko, O., Kubo, S., Murakami, S., Minami, T., Miyazawa, J., Nagayama, Y., Nishiura, M., Oka, Y., Sakamoto, R., Shimozuma, T., Takeiri, Y., Tanaka, K., Tsumori, K., Yamada, I., Yoshinuma, M., Kawahata, K., and Komori, A.

Published
2010

95. PARTICLE TRANSPORT OF LHD

Author

40249967, Tanaka, K., Kawahata, K., Tokuzawa, T., Akiyama, T., Yokoyama, M., Shoji, M., Michael, C. A., Vyacheslavov, L. N., Murakami, S., Wakasa, A., Mishchenko, A., Muraoka, K., Okajima, S., Takenaga, H., 40249967, Tanaka, K., Kawahata, K., Tokuzawa, T., Akiyama, T., Yokoyama, M., Shoji, M., Michael, C. A., Vyacheslavov, L. N., Murakami, S., Wakasa, A., Mishchenko, A., Muraoka, K., Okajima, S., and Takenaga, H.

Published
2010

96. FAST-ION CONFINEMENT STUDIES ON LHD

Author

40249967, 70397529, Osakabe, M., Isobe, M., Murakami, S., Kobayashi, S., Saito, K., Kumazawa, R., Mutoh, T., Ozaki, T., Nishiura, M., Veshchev, E., Seki, T., Takeiri, Y., Kaneko, O., Nagaoka, K., Tokuzawa, T., Ogawa, K., Toi, K., Yamamoto, S., Sasao, M., Watanabe, T., 40249967, 70397529, Osakabe, M., Isobe, M., Murakami, S., Kobayashi, S., Saito, K., Kumazawa, R., Mutoh, T., Ozaki, T., Nishiura, M., Veshchev, E., Seki, T., Takeiri, Y., Kaneko, O., Nagaoka, K., Tokuzawa, T., Ogawa, K., Toi, K., Yamamoto, S., Sasao, M., and Watanabe, T.

Published
2010

97. LOCAL TRANSPORT PROPERTY OF HIGH-BETA PLASMAS ON LHD

Author

40249967, Funaba, H., Watanabe, K. Y., Sakakibara, S., Murakami, S., Yamada, I., Narihara, K., Tanaka, K., Tokuzawa, T., Osakabe, M., Narushima, Y., Yokoyama, M., Ohdachi, S., Takeiri, Y., Yamada, H., Kawahata, K., 40249967, Funaba, H., Watanabe, K. Y., Sakakibara, S., Murakami, S., Yamada, I., Narihara, K., Tanaka, K., Tokuzawa, T., Osakabe, M., Narushima, Y., Yokoyama, M., Ohdachi, S., Takeiri, Y., Yamada, H., and Kawahata, K.

Published
2010

98. Development of net-current free heliotron plasmas in the Large Helical Device

Author

Komori, A., Yamada, H., Sakakibara, S., Kaneko, O., Kawahata, K., Mutoh, T., Ohyabu, N., Imagawa, S., Ida, K., Nagayama, Y., Shimozuma, T., Watanabe, K. Y., Mito, T., Kobayashi, M., Nagaoka, K., Sakamoto, R., Yoshida, N., Ohdachi, S., Ashikawa, N., Feng, Y., Fukuda, T., Igami, H., Inagaki, S., Kasahara, H., Kubo, S., Kumazawa, R., Mitarai, O., Murakami, S., Nakamura, Yuji, Nishiura, M., Hino, T., Masuzaki, S., Tanaka, K., Toi, K., Weller, A., Yoshinuma, M., Narushima, Y., Ohno, N., Okamura, T., Tamura, N., Saito, K., Seki, T., Sudo, S., Tanaka, H., Tokuzawa, T., Yanagi, N., Yokoyama, M., Yoshimura, Y., Akiyama, T., Chikaraishi, H., Chowdhuri, M., Emoto, M., Ezumi, N., Funaba, H., Garcia, L., Goncharov, P., Goto, M., Ichiguchi, K., Ichimura, M., Idei, H., Ido, T., Iio, S., Ikeda, K., Irie, M., Isayama, A., Ishigooka, T., Isobe, M., Ito, T., Itoh, K., Iwamae, A., Hamaguchi, S., Hamajima, T., Kitajima, S., Kado, S., Kato, D., Kato, T., Kobayashi, S., Kondo, K., Masamune, S., Matsumoto, Y., Matsunami, N., Minami, T., Michael, C., Miura, H., Miyazawa, J., Mizuguchi, N., Morisaki, T., Morita, S., Motojima, G., Murakami, I., Muto, S., Nagasaki, K., Nakajima, N., Nakamura, Y., Nakanishi, H., Nakano, H., Narihara, K., Nishimura, A., Nishimura, H., Nishimura, K., Nishimura, S., Nishino, N., Notake, T., Obana, T., Ogawa, K., Oka, Y., Ohishi, T., Okada, H., Okuno, K., Ono, K., Osakabe, M., Osako, T., Ozaki, T., Peterson, B. J., Sakaue, H., Sasao, M., Satake, S., Sato, K., Sato, M., Shimizu, A., Shiratani, M., Shoji, M., Sugama, H., Suzuki, C., Suzuki, Y., Takahata, K., Takahashi, H., Takase, Y., Takeiri, Y., Takenaga, H., Toda, S., Todo, Y., Tokitani, M., Tsuchiya, H., Tsumori, K., Urano, H., Veshchev, E., Watanabe, F., Watanabe, T., Watanabe, T. H., Yamada, I., Yamada, S., Yamagishi, O., Yamaguchi, S., Yoshimura, S., Yoshinaga, T., Motojima, O., Komori, A., Yamada, H., Sakakibara, S., Kaneko, O., Kawahata, K., Mutoh, T., Ohyabu, N., Imagawa, S., Ida, K., Nagayama, Y., Shimozuma, T., Watanabe, K. Y., Mito, T., Kobayashi, M., Nagaoka, K., Sakamoto, R., Yoshida, N., Ohdachi, S., Ashikawa, N., Feng, Y., Fukuda, T., Igami, H., Inagaki, S., Kasahara, H., Kubo, S., Kumazawa, R., Mitarai, O., Murakami, S., Nakamura, Yuji, Nishiura, M., Hino, T., Masuzaki, S., Tanaka, K., Toi, K., Weller, A., Yoshinuma, M., Narushima, Y., Ohno, N., Okamura, T., Tamura, N., Saito, K., Seki, T., Sudo, S., Tanaka, H., Tokuzawa, T., Yanagi, N., Yokoyama, M., Yoshimura, Y., Akiyama, T., Chikaraishi, H., Chowdhuri, M., Emoto, M., Ezumi, N., Funaba, H., Garcia, L., Goncharov, P., Goto, M., Ichiguchi, K., Ichimura, M., Idei, H., Ido, T., Iio, S., Ikeda, K., Irie, M., Isayama, A., Ishigooka, T., Isobe, M., Ito, T., Itoh, K., Iwamae, A., Hamaguchi, S., Hamajima, T., Kitajima, S., Kado, S., Kato, D., Kato, T., Kobayashi, S., Kondo, K., Masamune, S., Matsumoto, Y., Matsunami, N., Minami, T., Michael, C., Miura, H., Miyazawa, J., Mizuguchi, N., Morisaki, T., Morita, S., Motojima, G., Murakami, I., Muto, S., Nagasaki, K., Nakajima, N., Nakamura, Y., Nakanishi, H., Nakano, H., Narihara, K., Nishimura, A., Nishimura, H., Nishimura, K., Nishimura, S., Nishino, N., Notake, T., Obana, T., Ogawa, K., Oka, Y., Ohishi, T., Okada, H., Okuno, K., Ono, K., Osakabe, M., Osako, T., Ozaki, T., Peterson, B. J., Sakaue, H., Sasao, M., Satake, S., Sato, K., Sato, M., Shimizu, A., Shiratani, M., Shoji, M., Sugama, H., Suzuki, C., Suzuki, Y., Takahata, K., Takahashi, H., Takase, Y., Takeiri, Y., Takenaga, H., Toda, S., Todo, Y., Tokitani, M., Tsuchiya, H., Tsumori, K., Urano, H., Veshchev, E., Watanabe, F., Watanabe, T., Watanabe, T. H., Yamada, I., Yamada, S., Yamagishi, O., Yamaguchi, S., Yoshimura, S., Yoshinaga, T., and Motojima, O.

Published
2009

99. Development of net-current free heliotron plasmas in the Large Helical Device

Author

20198245, 20237506, 50169116, Komori, A., Yamada, H., Sakakibara, S., Kaneko, O., Kawahata, K., Mutoh, T., Ohyabu, N., Imagawa, S., Ida, K., Nagayama, Y., Shimozuma, T., Watanabe, K. Y., Mito, T., Kobayashi, M., Nagaoka, K., Sakamoto, R., Yoshida, N., Ohdachi, S., Ashikawa, N., Feng, Y., Fukuda, T., Igami, H., Inagaki, S., Kasahara, H., Kubo, S., Kumazawa, R., Mitarai, O., Murakami, S., Nakamura, Yuji, Nishiura, M., Hino, T., Masuzaki, S., Tanaka, K., Toi, K., Weller, A., Yoshinuma, M., Narushima, Y., Ohno, N., Okamura, T., Tamura, N., Saito, K., Seki, T., Sudo, S., Tanaka, H., Tokuzawa, T., Yanagi, N., Yokoyama, M., Yoshimura, Y., Akiyama, T., Chikaraishi, H., Chowdhuri, M., Emoto, M., Ezumi, N., Funaba, H., Garcia, L., Goncharov, P., Goto, M., Ichiguchi, K., Ichimura, M., Idei, H., Ido, T., Iio, S., Ikeda, K., Irie, M., Isayama, A., Ishigooka, T., Isobe, M., Ito, T., Itoh, K., Iwamae, A., Hamaguchi, S., Hamajima, T., Kitajima, S., Kado, S., Kato, D., Kato, T., Kobayashi, S., Kondo, K., Masamune, S., Matsumoto, Y., Matsunami, N., Minami, T., Michael, C., Miura, H., Miyazawa, J., Mizuguchi, N., Morisaki, T., Morita, S., Motojima, G., Murakami, I., Muto, S., Nagasaki, K., Nakajima, N., Nakamura, Y., Nakanishi, H., Nakano, H., Narihara, K., Nishimura, A., Nishimura, H., Nishimura, K., Nishimura, S., Nishino, N., Notake, T., Obana, T., Ogawa, K., Oka, Y., Ohishi, T., Okada, H., Okuno, K., Ono, K., Osakabe, M., Osako, T., Ozaki, T., Peterson, B. J., Sakaue, H., Sasao, M., Satake, S., Sato, K., Sato, M., Shimizu, A., Shiratani, M., Shoji, M., Sugama, H., Suzuki, C., Suzuki, Y., Takahata, K., Takahashi, H., Takase, Y., Takeiri, Y., Takenaga, H., Toda, S., Todo, Y., Tokitani, M., Tsuchiya, H., Tsumori, K., Urano, H., Veshchev, E., Watanabe, F., Watanabe, T., Watanabe, T. H., Yamada, I., Yamada, S., Yamagishi, O., Yamaguchi, S., Yoshimura, S., Yoshinaga, T., Motojima, O., 20198245, 20237506, 50169116, Komori, A., Yamada, H., Sakakibara, S., Kaneko, O., Kawahata, K., Mutoh, T., Ohyabu, N., Imagawa, S., Ida, K., Nagayama, Y., Shimozuma, T., Watanabe, K. Y., Mito, T., Kobayashi, M., Nagaoka, K., Sakamoto, R., Yoshida, N., Ohdachi, S., Ashikawa, N., Feng, Y., Fukuda, T., Igami, H., Inagaki, S., Kasahara, H., Kubo, S., Kumazawa, R., Mitarai, O., Murakami, S., Nakamura, Yuji, Nishiura, M., Hino, T., Masuzaki, S., Tanaka, K., Toi, K., Weller, A., Yoshinuma, M., Narushima, Y., Ohno, N., Okamura, T., Tamura, N., Saito, K., Seki, T., Sudo, S., Tanaka, H., Tokuzawa, T., Yanagi, N., Yokoyama, M., Yoshimura, Y., Akiyama, T., Chikaraishi, H., Chowdhuri, M., Emoto, M., Ezumi, N., Funaba, H., Garcia, L., Goncharov, P., Goto, M., Ichiguchi, K., Ichimura, M., Idei, H., Ido, T., Iio, S., Ikeda, K., Irie, M., Isayama, A., Ishigooka, T., Isobe, M., Ito, T., Itoh, K., Iwamae, A., Hamaguchi, S., Hamajima, T., Kitajima, S., Kado, S., Kato, D., Kato, T., Kobayashi, S., Kondo, K., Masamune, S., Matsumoto, Y., Matsunami, N., Minami, T., Michael, C., Miura, H., Miyazawa, J., Mizuguchi, N., Morisaki, T., Morita, S., Motojima, G., Murakami, I., Muto, S., Nagasaki, K., Nakajima, N., Nakamura, Y., Nakanishi, H., Nakano, H., Narihara, K., Nishimura, A., Nishimura, H., Nishimura, K., Nishimura, S., Nishino, N., Notake, T., Obana, T., Ogawa, K., Oka, Y., Ohishi, T., Okada, H., Okuno, K., Ono, K., Osakabe, M., Osako, T., Ozaki, T., Peterson, B. J., Sakaue, H., Sasao, M., Satake, S., Sato, K., Sato, M., Shimizu, A., Shiratani, M., Shoji, M., Sugama, H., Suzuki, C., Suzuki, Y., Takahata, K., Takahashi, H., Takase, Y., Takeiri, Y., Takenaga, H., Toda, S., Todo, Y., Tokitani, M., Tsuchiya, H., Tsumori, K., Urano, H., Veshchev, E., Watanabe, F., Watanabe, T., Watanabe, T. H., Yamada, I., Yamada, S., Yamagishi, O., Yamaguchi, S., Yoshimura, S., Yoshinaga, T., and Motojima, O.

Published
2009

100. Density limit study focusing on the edge plasma parameters in LHD

Author

Miyazawa, J, Sakamoto, R, Masuzaki, S, Peterson, BJ, Tamura, N, Goto, M, Yamada, I, Narihara, K, Tanaka, K, Tokuzawa, T, Shoji, M, Kobayashi, M, Arimoto, H, Kondo, K, Murakami, S, Funaba, H, Sakakibara, S, Osakabe, M, Morita, S, Nagayama, Y, Ohyabu, N, Yamada, H, Komori, A, Motojima, O, Miyazawa, J, Sakamoto, R, Masuzaki, S, Peterson, BJ, Tamura, N, Goto, M, Yamada, I, Narihara, K, Tanaka, K, Tokuzawa, T, Shoji, M, Kobayashi, M, Arimoto, H, Kondo, K, Murakami, S, Funaba, H, Sakakibara, S, Osakabe, M, Morita, S, Nagayama, Y, Ohyabu, N, Yamada, H, Komori, A, and Motojima, O

Published
2008

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