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Your search keyword '"Kado, S."' showing total 19 results
Start Over Author "Kado, S." Journal physics of plasmas
19 results on '"Kado, S."'

2. Response of a core coherent density oscillation on electron cyclotron resonance heating in Heliotron J plasma

Author

Kobayashi, T., primary, Kobayashi, S., additional, Lu, X. X., additional, Kenmochi, N., additional, Ida, K., additional, Ohshima, S., additional, Yamamoto, S., additional, Kado, S., additional, Kokubu, D., additional, Nagasaki, K., additional, Okada, H., additional, Minami, T., additional, Otani, Y., additional, and Mizuuchi, T., additional

Published
2018
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3. Application of the Zeeman patterns in Ov and H-alpha spectra to the local plasma diagnostics of the TRIAM-1M tokamak

Author

Shikama, T, Kado, S, Zushi, H, Iwamae, A, and Tanaka, S

Subjects
Physics::Atomic Physics
Abstract

The positions of emission of berylliumlike oxygen ions in the core region as well as the hydrogen atoms in the boundary region of the limiter shadow have been measured by means of the difference of the Zeeman patterns in the spectral shape in the poloidal section of the TRIAM-1M super conductingtokamak [H. Zushi et al., Nucl. Fusion 43, 1600 (2003)]. For determining magnetic field strength, the σ components of the Zeemanspectra are resolved by a linear polarizer. In addition to the emission region, the local hydrogen neutral temperature and the recycling flow velocity are measured in the boundary region, and the bulk ion temperature is measured in the core region.

Published
2004

4. Neoclassical parallel flow calculation in the presence of external parallel momentum sources in Heliotron J

Author

Nishioka, K., primary, Nakamura, Y., additional, Nishimura, S., additional, Lee, H. Y., additional, Kobayashi, S., additional, Mizuuchi, T., additional, Nagasaki, K., additional, Okada, H., additional, Minami, T., additional, Kado, S., additional, Yamamoto, S., additional, Ohshima, S., additional, Konoshima, S., additional, and Sano, F., additional

Published
2016
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5. Effect of supersonic molecular-beam injection on edge fluctuation and particle transport in Heliotron J

Author

Ohshima, S., primary, Mizuuchi, T., additional, Nishino, N., additional, Yamamoto, S., additional, Kasajima, K., additional, Hashimoto, K., additional, Sha, M., additional, Takeuchi, M., additional, Mukai, K., additional, Lee, H. Y., additional, Kenmochi, N., additional, Nagasaki, K., additional, Kado, S., additional, Okada, H., additional, Minami, T., additional, Kobayashi, S., additional, Shi, N., additional, Konoshima, S., additional, Nakamura, Y., additional, and Sano, F., additional

Published
2014
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11. Improved plasma performance on Large Helical Device

Author

Komori, A., primary, Ohyabu, N., additional, Yamada, H., additional, Kaneko, O., additional, Kawahata, K., additional, Ashikawa, N., additional, deVaries, P., additional, Emoto, M., additional, Funaba, H., additional, Goto, M., additional, Ida, K., additional, Idei, H., additional, Ikeda, K., additional, Inagaki, S., additional, Inoue, N., additional, Isobe, M., additional, Kado, S., additional, Khlopenkov, K., additional, Kobuchi, T., additional, Kubo, S., additional, Kumazawa, R., additional, Liang, Y., additional, Masuzaki, S., additional, Matsumoto, Y., additional, Minami, T., additional, Miyazawa, J., additional, Morisaki, T., additional, Morita, S., additional, Murakami, S., additional, Muto, S., additional, Mutoh, T., additional, Nagayama, Y., additional, Nakamura, Y., additional, Nakanishi, H., additional, Narihara, K., additional, Narushima, Y., additional, Nishimura, K., additional, Noda, N., additional, Notake, T., additional, Ohdachi, S., additional, Oka, Y., additional, Okamoto, M., additional, Osakabe, M., additional, Ozaki, T., additional, Pavlichenko, R. O., additional, Peterson, B. J., additional, Sagara, A., additional, Saito, K., additional, Sakakibara, S., additional, Sakamoto, R., additional, Sasao, H., additional, Sasao, M., additional, Sato, K., additional, Sato, M., additional, Seki, T., additional, Shimozuma, T., additional, Shoji, M., additional, Suzuki, H., additional, Takechi, M., additional, Takeiri, Y., additional, Tamura, N., additional, Tanaka, K., additional, Toi, K., additional, Tokuzawa, T., additional, Torii, Y., additional, Tsumori, K., additional, Yamada, I., additional, Yamaguchi, S., additional, Yamamoto, S., additional, Yokoyama, M., additional, Yoshimura, Y., additional, Watanabe, K. Y., additional, Watanabe, T., additional, Watari, T., additional, Hamada, Y., additional, Itoh, K., additional, Matsuoka, K., additional, Ohkubo, K., additional, Satow, T., additional, Sudo, S., additional, Yamazaki, K., additional, Motojima, O., additional, and Fujiwara, M., additional

Published
2001
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12. Experimental test of the radial force balance equation in the compact helical system

Author

Ida, K., primary, Fujisawa, A., additional, Iguchi, H., additional, Yoshimura, Y., additional, Minami, T., additional, Okamura, S., additional, Nishimura, S., additional, Isobe, M., additional, Kado, S., additional, Liang, Y., additional, Nomura, I., additional, Tanaka, K., additional, Osakabe, M., additional, Takahashi, C., additional, and Matsuoka, K., additional

Published
2001
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13. Experimental study of the bifurcation nature of the electrostatic potential of a toroidal helical plasma

Author

Fujisawa, A., primary, Iguchi, H., additional, Minami, T., additional, Yoshimura, Y., additional, Tanaka, K., additional, Itoh, K., additional, Sanuki, H., additional, Lee, S., additional, Kojima, M., additional, Itoh, S.-I., additional, Yokoyama, M., additional, Kado, S., additional, Okamura, S., additional, Akiyama, R., additional, Ida, K., additional, Isobe, M., additional, Nishimura, S., additional, Osakabe, M., additional, Nomura, I., additional, Shimizu, A., additional, Takahashi, C., additional, Toi, K., additional, Matsuoka, K., additional, Hamada, Y., additional, and Fujiwara, M., additional

Published
2000
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14. Thermal transport barrier in heliotron-type devices (Large Helical Device and Compact Helical System)

Author

Ohyabu, N., primary, Fujisawa, A., additional, Ashikawa, N., additional, deVries, P., additional, Emoto, M., additional, Funaba, H., additional, Goto, M., additional, Hamada, Y., additional, Iguchi, H., additional, Ida, K., additional, Itoh, K., additional, Isobe, M., additional, Idei, H., additional, Inagaki, S., additional, Inoue, N., additional, Ikeda, K., additional, Kado, S., additional, Kubo, S., additional, Kumazawa, R., additional, Khlopenkov, K., additional, Kaneko, O., additional, Kawahata, K., additional, Komori, A., additional, Kobuchi, T., additional, Lee, S., additional, Liang, Y., additional, Minami, T., additional, Miyazawa, J., additional, Masuzaki, S., additional, Matsuoka, K., additional, Morisaki, T., additional, Morita, S., additional, Murakami, S., additional, Mutoh, T., additional, Muto, S., additional, Narihara, K., additional, Nagayama, Y., additional, Nakamura, Y., additional, Nakanishi, H., additional, Nishimura, K., additional, Nishimura, S., additional, Noda, N., additional, Nomura, I., additional, Notake, T., additional, Okamura, S., additional, Ohdachi, S., additional, Ohkubo, K., additional, Oka, Y., additional, Osakabe, M., additional, Ozaki, T., additional, Peterson, B. J., additional, Pavlichenko, R. O., additional, Sagara, A., additional, Sakakibara, S., additional, Sakamoto, R., additional, Sasao, M., additional, Sato, K., additional, Sanuki, H., additional, Saito, K., additional, Sato, M., additional, Seki, T., additional, Shimizu, A., additional, Shimozuma, T., additional, Shoji, M., additional, Suzuki, H., additional, Sudo, S., additional, Sasao, H., additional, Takeiri, Y., additional, Tanaka, K., additional, Toi, K., additional, Tokuzawa, T., additional, Tsumori, K., additional, Tsuzuki, K., additional, Takechi, M., additional, Tamura, N., additional, Torii, Y., additional, Yamada, I., additional, Yamada, H., additional, Yamaguchi, S., additional, Yamazaki, K., additional, Yokoyama, M., additional, Yoshimura, Y., additional, Yamamoto, S., additional, Watanabe, K. Y., additional, Watanabe, T., additional, Watari, T., additional, Motojima, O., additional, and Fujiwara, M., additional

Published
2000
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15. Effect of supersonic molecular-beam injection on edge fluctuation and particle transport in Heliotron J.

Author

Zang, L., Ohshima, S., Mizuuchi, T., Nishino, N., Yamamoto, S., Kasajima, K., Hashimoto, K., Sha, M., Takeuchi, M., Mukai, K., Lee, H. Y., Kenmochi, N., Nagasaki, K., Kado, S., Okada, H., Minami, T., Kobayashi, S., Shi, N., Konoshima, S., and Nakamura, Y.

Subjects
MOLECULAR beams, BEAM injection, FLUCTUATIONS (Physics), ENERGY storage, GAUSSIAN beams, PHASE transitions
Abstract

Edge fluctuation in a supersonic molecular-beam injection (SMBI) fueled plasma has been measured using an electrostatic probe array. After SMBI, the plasma stored energy (Wp) temporarily decreased then started to increase. The local plasma fluctuation and fluctuation induced particle transport before and after SMBI have been analyzed. In a short duration (4 ms) just after SMBI, the density fluctuation of broad-band low frequency increased, and the probability density function (PDF) changed from a nearly Gaussian to a positively skewed non-Gaussian one. This suggests that intermittent structures were produced due to SMBI. Also the fluctuation induced particle transport was greatly enhanced during this short duration. About 4ms after SMBI, the low frequency broad-band density fluctuation decreased, and the PDF returned to a nearly Gaussian shape. Also the fluctuation induced particle transport was reduced. Compared with conventional gas puff, Wp degradation window is very short due to the short injection period of SMBI. After this short degradation window, fluctuation induced particle transport was reduced and Wp started the climbing phase. Therefore, the short period of the influence to the edge fluctuation might be an advantage of this novel fueling technique. On the other hand, although their roles are not identified at present, coherent MHD modes are also suppressed as well by the application of SMBI. These MHD modes are thought to be de-exited due to a sudden change of the edge density and/or excitation conditions. [ABSTRACT FROM AUTHOR]

Published
2014
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16. Initial physics achievements of large helical device experiments

Author

Motojima, O., primary, Yamada, H., additional, Komori, A., additional, Ohyabu, N., additional, Kawahata, K., additional, Kaneko, O., additional, Masuzaki, S., additional, Ejiri, A., additional, Emoto, M., additional, Funaba, H., additional, Goto, M., additional, Ida, K., additional, Idei, H., additional, Inagaki, S., additional, Inoue, N., additional, Kado, S., additional, Kubo, S., additional, Kumazawa, R., additional, Minami, T., additional, Miyazawa, J., additional, Morisaki, T., additional, Morita, S., additional, Murakami, S., additional, Muto, S., additional, Mutoh, T., additional, Nagayama, Y., additional, Nakamura, Y., additional, Nakanishi, H., additional, Narihara, K., additional, Nishimura, K., additional, Noda, N., additional, Kobuchi, T., additional, Ohdachi, S., additional, Oka, Y., additional, Osakabe, M., additional, Ozaki, T., additional, Peterson, B. J., additional, Sagara, A., additional, Sakakibara, S., additional, Sakamoto, R., additional, Sasao, H., additional, Sasao, M., additional, Sato, K., additional, Sato, M., additional, Seki, T., additional, Shimozuma, T., additional, Shoji, M., additional, Suzuki, H., additional, Takeiri, Y., additional, Tanaka, K., additional, Toi, K., additional, Tokuzawa, T., additional, Tsumori, K., additional, Tsuzuki, K., additional, Yamada, I., additional, Yamaguchi, S., additional, Yokoyama, M., additional, Watanabe, K. Y., additional, Watari, T., additional, Hamada, Y., additional, Matsuoka, K., additional, Murai, K., additional, Ohkubo, K., additional, Ohtake, I., additional, Okamoto, M., additional, Satoh, S., additional, Satow, T., additional, Sudo, S., additional, Tanahashi, S., additional, Yamazaki, K., additional, Fujiwara, M., additional, and Iiyoshi, A., additional

Published
1999
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17. Molecular Zeeman spectroscopy for H2 Fulcher-α band spectra as a local measurement of rovibrational structures.

Author

Shikama, T., Kado, S., Zushi, H., and Tanaka, S.

Subjects
*MAGNETIC fields, *ZEEMAN effect, *HYDROGEN, *SPECTRUM analysis, *PHYSICAL & theoretical chemistry, *MAGNETICS, *EMISSIONS (Air pollution)
Abstract

A diagnostic technique for the local measurement of emissions from the molecular hydrogen has been developed. In the presence of an external magnetic field, the emission position can be deduced from the Zeeman patterns in the spectral line shape, and with the aid of the coronal model the rovibronic emission intensity provides the local rovibrational temperatures. In order to evaluate the Zeeman effect on the hydrogen molecule, a quantum-mechanical calculation is performed. The experimentally observed Fulcher-α rovibronic band spectra under a magnetic field strength of about 7 T are well represented by the calculation. The temporal evolution of the emission position as well as the rovibrational temperatures are measured in the 8.2 GHz lower hybrid current drive discharges of the TRIAM-1M tokamak [H. Zushi et al., Nucl. Fusion 45, S142 (2005)]. The measured emission is found to originate from the region where the plasma comes in contact with the limiter, and the observed increase in the rotational temperature suggests a rise in the limiter surface temperature. [ABSTRACT FROM AUTHOR]

Published
2007
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18. Observation of radial phase shift of the edge harmonic oscillation in the edge transport barrier discharges in the Compact Helical System using beam emission spectroscopy.

Author

Oishi, T., Kado, S., Yoshinuma, M., Ida, K., Akiyama, T., Minami, T., Nagaoka, K., Shimizu, A., Okamura, S., and Tanaka, S.

Subjects
*PLASMA oscillations, *TOKAMAKS, *ELECTRON transport, *EMISSION spectroscopy, *MAGNETIC fields, *PLASMA confinement
Abstract

In the present study, a coherent density fluctuation similar to the edge harmonic oscillation (EHO) in tokamaks was observed in the edge transport barrier discharge in the Compact Helical System (CHS) [K. Matsuoka et al., Plasma Physics and Controlled Nuclear Fusion Research, 1988 (International Atomic Energy Agency, Vienna, 1989), Vol. 2, pp. 441] using beam emission spectroscopy (BES). The fluctuation had both fundamental (f=4.5 kHz) and second-harmonic (2f=9 kHz) frequencies. EHO in CHS had a peak amplitude at approximately ρ=0.95. The mode has a continuous phase shift in the radial direction. If this is interpreted as the radial propagation, the mode propagates in the outer radial direction at an apparent phase velocity of several hundreds of meters per second, which is a characteristic similar to the radial phase shift of EHO in tokamaks. [ABSTRACT FROM AUTHOR]

Published
2006
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19. Application of the Zeeman patterns in Ov and Hα spectra to the local plasma diagnostics of the TRIAM-1M tokamak.

Author

Shikama, T., Kado, S., Zushi, H., Iwamae, A., and Tanaka, S.

Subjects
*TOKAMAKS, *PLASMA diagnostics, *SPECTRUM analysis, *HYDROGEN, *MAGNETIC fields, *IONS
Abstract

The positions of emission of berylliumlike oxygen ions in the core region as well as the hydrogen atoms in the boundary region of the limiter shadow have been measured by means of the difference of the Zeeman patterns in the spectral shape in the poloidal section of the TRIAM-1M super conducting tokamak [H. Zushi et al., Nucl. Fusion 43, 1600 (2003)]. For determining magnetic field strength, the σ components of the Zeeman spectra are resolved by a linear polarizer. In addition to the emission region, the local hydrogen neutral temperature and the recycling flow velocity are measured in the boundary region, and the bulk ion temperature is measured in the core region. [ABSTRACT FROM AUTHOR]

Published
2004
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