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1. RF sources for ITER Ion Cyclotron H&CD system

Author

Kazarian, F., Beaumont, B., Arambhadiya, B., Gassmann, T., Lamalle, Ph., Rathi, D., Mukherjee, A., Ajesh, P., Machchhar, H., Patadia, D., Patel, M., Rajnish, K., Singh, R., Suthar, G., Trivedi, R., Kumazawa, R., Seki, T., Saito, K., Kasahara, H., Mutoh, T., Shimpo, F., and Nomura, G.

Published
2011
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10. Results of lower hybrid wave experiments using a dielectric loaded waveguide array antenna on TST-2

Author

Wakatsuki, T., primary, Ejiri, A., additional, Shinya, T., additional, Takase, Y., additional, Furui, H., additional, Hiratsuka, J., additional, Imamura, K., additional, Inada, T., additional, Kakuda, H., additional, Kasahara, H., additional, Nagashima, Y., additional, Nakamura, K., additional, Nakanishi, A., additional, Oosako, T., additional, Saito, K., additional, Seki, T., additional, Shimpo, F., additional, Sonehara, M., additional, Togashi, H., additional, Tsuda, S., additional, Tsujii, N., additional, and Yamaguchi, T., additional

Published
2014
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12. First ICRF Heating Experiment in the Large Helical Device

Author

Mutoh, T., Kumazawa, R., Seki, T., Saito, K., Shimpo, F., Nomura, G., Watari, T., Jikang, X., Cattanei, G., Okada, H., Ohkubo, K., Sato, M., Kubo, S., Shimozuma, T., Idei, H., Yoshimura, Y., Kaneko, O., Takeiri, Y., Osakabe, M., Oka, Y., Tsumori, K., Komori, A., Yamada, H., Watanabe, K., Sakakibara, S., Shoji, M., Sakamoto, R., Inagaki, S., Miyazawa, J., Morita, S., Tanaka, K., Peterson, B., Murakami, S., Minami, T., Ohdachi, S., Kado, S., Narihara, K., Sasao, H., Suzuki, H., Kawahata, K., Ohyabu, N., Nakamura, Y., Funaba, H., Masuzaki, S., Muto, S., Sato, K., Morisaki, T., Sudo, S., Nagayama, Y., Watanabe, T., Sasao, M., Ida, K., Noda, N., Yamazaki, K., Akaishi, K., Sagara, A., Nishimura, K., Ozaki, T., Toi, K., Motojima, O., Fujiwara, M., Iiyoshi, A., LHD Exp. Group 1, and LHD Exp. Group 2

Published
1999

13. ICRF HEATING AND ION TAIL FORMATION IN LHD

Author

Saito, K., Kumazawa, R., Seki, T., Kasahara, H., Osakabe, M., Isobe, M., Shimpo, F., Nomura, G., Watari, T., Murakami, S., Sasao, M., Mutoh, T., Saito, K., Kumazawa, R., Seki, T., Kasahara, H., Osakabe, M., Isobe, M., Shimpo, F., Nomura, G., Watari, T., Murakami, S., Sasao, M., and Mutoh, T.

Published
2010

14. ICRF HEATING AND ION TAIL FORMATION IN LHD

Author

40249967, Saito, K., Kumazawa, R., Seki, T., Kasahara, H., Osakabe, M., Isobe, M., Shimpo, F., Nomura, G., Watari, T., Murakami, S., Sasao, M., Mutoh, T., 40249967, Saito, K., Kumazawa, R., Seki, T., Kasahara, H., Osakabe, M., Isobe, M., Shimpo, F., Nomura, G., Watari, T., Murakami, S., Sasao, M., and Mutoh, T.

Published
2010

16. Plasma Curent Start-up Experiment using Waves in the Lower Hybrid Frequency Range in TST-2

Author

Takase, Y., primary, Wakatsuki, T., additional, Ejiri, A., additional, Kakuda, H., additional, Moeller, C. P., additional, Ambo, T., additional, Hanashima, K., additional, Hiratsuka, J., additional, Kasahara, H., additional, Kumazawa, R., additional, Nagashima, Y., additional, Saito, K., additional, Sakamoto, T., additional, Seki, T., additional, Shimpo, F., additional, Shino, R., additional, Sonehara, M., additional, Watanabe, O., additional, Yamaguchi, T., additional, Phillips, Cynthia K., additional, and Wilson, James R., additional

Published
2011
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17. Parametric decay instability during high harmonic fast wave heating experiments on the TST-2 spherical tokamak

Author

Oosako, T., primary, Takase, Y., additional, Ejiri, A., additional, Nagashima, Y., additional, Adachi, Y., additional, Kasahara, H., additional, Yamada, T., additional, Watanabe, O., additional, Tojo, H., additional, Kainaga, S., additional, Sugiyama, J., additional, Yamaguchi, T., additional, An, B., additional, Hayashi, H., additional, Kobayashi, H., additional, Kurashina, H., additional, Matsuzawa, H., additional, Yamada, K., additional, Kumazawa, R., additional, Shimpo, F., additional, Ono, Y., additional, Masuda, T., additional, and Sasaki, M., additional

Published
2009
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18. Non-inductive plasma current start-up by EC and RF power in the TST-2 spherical tokamak

Author

Ejiri, A., primary, Takase, Y., additional, Oosako, T., additional, Yamaguchi, T., additional, Adachi, Y., additional, Watanabe, O., additional, Nagashima, Y., additional, An, B.I., additional, Kobayashi, H., additional, Kurashina, H., additional, Hayashi, H., additional, Matsuzawa, H., additional, Yamada, K., additional, Tojo, H., additional, Masuda, T., additional, Sasaki, M., additional, Kumazawa, R., additional, Kasahara, H., additional, and Shimpo, F., additional

Published
2009
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19. The observation of nonlinear ion cyclotron wave excitation during high-harmonic fast wave heating in the large helical device

Author

Kasahara, H., primary, Seki, T., additional, Kumazawa, R., additional, Saito, K., additional, Mutoh, T., additional, Kubo, S., additional, Shimozuma, T., additional, Igami, H., additional, Yoshimura, Y., additional, Takahashi, H., additional, Yamada, I., additional, Tokuzawa, T., additional, Ohdachi, S., additional, Morita, S., additional, Nomura, G., additional, Shimpo, F., additional, Komori, A., additional, Motojima, O., additional, Oosako, T., additional, Takase, Y., additional, Zhao, Y., additional, and Kwak, J., additional

Published
2008
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21. Steady-state operation and high energy particle production of MeV energy in the Large Helical Device

Author

Mutoh, T., primary, Kumazawa, R., additional, Seki, T., additional, Saito, K., additional, Kasahara, H., additional, Nakamura, Y., additional, Masuzaki, S., additional, Kubo, S., additional, Takeiri, Y., additional, Shimozuma, T., additional, Yoshimura, Y., additional, Igami, H., additional, Watanabe, T., additional, Ogawa, H., additional, Miyazawa, J., additional, Shoji, M., additional, Ashikawa, N., additional, Nishimura, K., additional, Osakabe, M., additional, Tsumori, K., additional, Ikeda, K., additional, Nagaoka, K., additional, Oka, Y., additional, Chikaraishi, H., additional, Funaba, H., additional, Morita, S., additional, Goto, M., additional, Inagaki, S., additional, Narihara, K., additional, Tokuzawa, T., additional, Sakamoto, R., additional, Morisaki, T., additional, Peterson, B.J., additional, Tanaka, K., additional, Nakanishi, H., additional, Nishiura, M., additional, Ozaki, T., additional, Shimpo, F., additional, Nomura, G., additional, Takahashi, C., additional, Yokota, M., additional, Zhao, Y.P., additional, Kwak, J.G., additional, Murakami, S., additional, Okada, H., additional, Yamada, H., additional, Kawahata, K., additional, Ohyabu, N., additional, Kaneko, O., additional, Ida, K., additional, Nagayama, Y., additional, Watanabe, K.Y., additional, Noda, N., additional, Komori, A., additional, Sudo, S., additional, and Motojima, O., additional

Published
2007
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22. Long-pulse plasma discharge on the Large Helical Device

Author

Kumazawa, R, primary, Mutoh, T, additional, Saito, K, additional, Seki, T, additional, Nakamura, Y, additional, Kubo, S, additional, Shimozuma, T, additional, Yoshimura, Y, additional, Igami, H, additional, Ohkubo, K, additional, Takeiri, Y, additional, Oka, Y, additional, Tsumori, K, additional, Osakabe, M, additional, Ikeda, K, additional, Nagaoka, K, additional, Kaneko, O, additional, Miyazawa, J, additional, Morita, S, additional, Narihara, K, additional, Shoji, M, additional, Masuzaki, S, additional, Kobayashi, M, additional, Ogawa, H, additional, Goto, M, additional, Morisaki, T, additional, Peterson, B.J, additional, Sato, K, additional, Tokuzawa, T, additional, Ashikawa, N, additional, Nishimura, K, additional, Funaba, H, additional, Chikaraishi, H, additional, Watari, T, additional, Watanabe, T, additional, Sakamoto, M, additional, Ichimura, M, additional, Takase, Y, additional, Notake, T, additional, Takeuchi, N, additional, Torii, Y, additional, Shimpo, F, additional, Nomura, G, additional, Takahashi, C, additional, Yokota, M, additional, Kato, A, additional, Zhao, Y, additional, Kwak, J.G, additional, Yoon, J.S, additional, Yamada, H, additional, Kawahata, K, additional, Ohyabu, N, additional, Ida, K, additional, Nagayama, Y, additional, Noda, N, additional, Komori, A, additional, Sudo, S, additional, Motojima, O, additional, and group, LHD experiment, additional

Published
2006
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23. ICRF Heated Long-Pulse Plasma Discharges in LHD

Author

Kumazawa, R, primary, Seki, T, additional, Mutoh, T, additional, Saito, K, additional, Watari, T, additional, Nakamura, Y, additional, Sakamoto, M, additional, Watanabe, T, additional, Kubo, S, additional, Shimozuma, T, additional, Yoshimura, Y, additional, Igami, H, additional, Takeiri, Y, additional, Oka, Y, additional, Tsumori, K, additional, Osakabe, M, additional, Ikeda, K, additional, Nagaoka, K, additional, Kaneko, O, additional, Miyazawa, J, additional, Morita, S, additional, Narihara, K, additional, Shoji, M, additional, Masuzaki, S, additional, Goto, M, additional, Morisaki, T, additional, Peterson, B J, additional, Sato, K, additional, Tokuzawa, T, additional, Ashikawa, N, additional, Nishimura, K, additional, Funaba, H, additional, Chikaraishi, H, additional, Notake, T, additional, Torii, Y, additional, Okada, H, additional, Ichimura, M, additional, Higaki, H, additional, Takase, Y, additional, Kasahara, H, additional, Shimpo, F, additional, Nomura, G, additional, Takahashi, C, additional, Yokota, M, additional, Kato, A, additional, Yanping, Zhao, additional, Yoon, J S, additional, Kwak, J G, additional, Yamada, H, additional, Kawahata, K, additional, Ohyabu, N, additional, Ida, K, additional, Nagayama, Y, additional, Noda, N, additional, Komori, A, additional, Sudo, S, additional, Motojima, O, additional, and Group, the LHD Experimental, additional

Published
2006
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24. Studies of the Electrical Properties of the LHD Combline Antenna

Author

Takeuchi, N., primary, Seki, T., additional, Saito, K., additional, Watari, T., additional, Kumazawa, R., additional, Mutoh, T., additional, Torii, Y., additional, Nomura, G., additional, Kato, A., additional, Shimpo, F., additional, Takase, Y., additional, Kasahara, H., additional, Taniguchi, T., additional, Wada, H., additional, Kasuya, N., additional, Yamagishi, K., additional, Moeller, C. P., additional, Saigusa, M., additional, and Yanping, Z., additional

Published
2005
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25. Experiments using ICRF Heating Antenna with Toroidal Phase Control Capability on LHD.

Author

Kumazawa, R., Seki, T., Mutoh, T., Saito, K., Kasahara, H., Nomura, G., Shimpo, F., Zhao, Y., and Kwak, J. G.

Subjects
ION cyclotron resonance spectrometry, PHYSICS experiments, ANTENNAS (Electronics), TOROIDAL magnetic circuits, MICROWAVE heating, ELECTRIC discharges, HYDROGEN ions, ELECTRIC resistance
Abstract

The large helical device (LHD) has fourteen experiment cycles so far. The ion cyclotron range of frequencies (ICRF) heating has been carried out successfully on LHD; High RF power heating up to 3MW and the long pulse plasma discharge up to about one hour (54 minutes) have been achieved using the poloidal array (PA) antennas. In the 14th experiment cycle (2010) a new one pair of ICRF heating antennas was installed in LHD. This pair consists of two antennas arrayed in the toroidal direction and has a controllability of the wave number along the magnetic field line k∥ with changing the phase difference between them. The target plasma consisted of the helium plasma as the majority with the hydrogen-ion minority. Several experiment results were obtained and compared with those obtained using the PA antenna (no capability of changing k∥). The fast wave with a large k∥ is excited with (0, π) phasing between two antennas, and a small wave-number of k∥ with (0, 0) phasing. The plasma loading resistance in (0, π) was found to be smaller than that of (0, 0) phasing. On the other hand the plasma heating efficiency in (0, π) phasing was much better than that in (0, 0) phasing. The plasma heating efficiency was assessed using the modulated RF power and the variation of plasma stored energy in the RF power modulation method. [ABSTRACT FROM AUTHOR]

Published
2011
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26. Plasma Curent Start-up Experiment using Waves in the Lower Hybrid Frequency Range in TST-2.

Author

Takase, Y., Wakatsuki, T., Ejiri, A., Kakuda, H., Moeller, C. P., Ambo, T., Hanashima, K., Hiratsuka, J., Kasahara, H., Kumazawa, R., Nagashima, Y., Saito, K., Sakamoto, T., Seki, T., Shimpo, F., Shino, R., Sonehara, M., Watanabe, O., and Yamaguchi, T.

Subjects
PLASMA gases, ELECTRIC currents, RADIO frequency, ELECTRIC displacement, TOKAMAKS, PERMITTIVITY, STATISTICAL bootstrapping, ELECTRONIC excitation, ELECTRON temperature
Abstract

Noninductive plasma current (Ip) start-up experiments using RF power in the lower hybrid frequency range are being conducted on the TST-2 spherical tokamak. The lower hybrid wave (LHW) has demonstrated efficient current drive in conventional tokamaks. However, in spherical tokamak (ST) plasmas with very high dielectric constants (;[variant_greek_epsilon]∼ωpe2/Ωe2>1), accessibility of the LHW to the plasma core is severely limited. Our approach is to keep the plasma density low (such that [variant_greek_epsilon]∼1) during Ip ramp-up. Once Ip reaches a level sufficiently high for neutral beam current drive, plasma can be densified and transformed into an advanced tokamak plasma dominated by the self-driven bootstrap current. Initial plasma start-up experiments were performed on TST-2 using a combline antenna which excites a traveling fast wave. After formation of toroidal flux surfaces, RF power and vertical field were ramped up to increase Ip. Up to 12 kA of Ip has been obtained by this method. Soft X-ray measurements indicate that the electron temperature increases as Ip increases, and hard X-ray spectroscopy indicates that energetic electrons build up as Ip is ramped up. [ABSTRACT FROM AUTHOR]

Published
2011
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27. Ion cyclotron range of frequencies heating and high-energy particle production in the Large Helical Device

Author

Mutoh, T, primary, Kumazawa, R, additional, Seki, T, additional, Saito, K, additional, Watari, T, additional, Torii, Y, additional, Takeuchi, N, additional, Yamamoto, T, additional, Shimpo, F, additional, Nomura, G, additional, Yokota, M, additional, Osakabe, M, additional, Sasao, M, additional, Murakami, S, additional, Ozaki, T, additional, Saida, T, additional, Zhao, Y.P, additional, Okada, H, additional, Takase, Y, additional, Fukuyama, A, additional, Ashikawa, N, additional, Emoto, M, additional, Funaba, H, additional, Goncharov, P, additional, Goto, M, additional, Ida, K, additional, Idei, H, additional, Ikeda, K, additional, Inagaki, S, additional, Isobe, M, additional, Kaneko, O, additional, Kawahata, K, additional, Khlopenkov, K, additional, Kobuchi, T, additional, Komori, A, additional, Kostrioukov, A, additional, Kubo, S, additional, Liang, Y, additional, Masuzaki, S, additional, Minami, T, additional, Mito, T, additional, Miyazawa, J, additional, Morisaki, T, additional, Morita, S, additional, Muto, S, 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, Ohtake, I, additional, Ohyabu, N, additional, Oka, Y, additional, Peterson, B.J, additional, Sagara, A, additional, Sakakibara, S, additional, Sakamoto, R, additional, Sato, K, additional, Sato, M, additional, Shimozuma, T, additional, Shoji, M, additional, Suzuki, H, additional, Takeiri, Y, additional, Tamura, N, additional, Tanaka, K, additional, Toi, K, additional, Tokuzawa, T, additional, Tsumori, K, additional, Watanabe, K.Y, additional, Xu, Y, additional, Yamada, H, additional, Yamada, I, additional, Yamamoto, S, additional, Yokoyama, M, additional, Yoshimura, Y, additional, Yoshinuma, M, additional, Itoh, K, additional, Ohkubo, K, additional, Satow, T, additional, Sudo, S, additional, Uda, T, additional, Yamazaki, K, additional, Matsuoka, K, additional, Motojima, O, additional, Hamada, Y, additional, and Fujiwara, M, additional

Published
2003
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28. Confinement characteristics of high-energy ions produced by ICRF heating in the large helical device

Author

Kumazawa, R, primary, Saito, K, additional, Torii, Y, additional, Mutoh, T, additional, Seki, T, additional, Watari, T, additional, Osakabe, M, additional, Murakami, S, additional, Sasao, M, additional, Watanabe, T, additional, Yamamoto, T, additional, Notake, T, additional, Takeuchi, N, additional, Saida, T, additional, Shimpo, F, additional, Nomura, G, additional, Yokota, M, additional, Kato, A, additional, Zao, Y, additional, Okada, H, additional, Isobe, M, additional, Ozaki, T, additional, Narihara, K, additional, Nagayama, Y, additional, Inagaki, S, additional, Morita, S, additional, Krasilnikov, A V, additional, Idei, H, additional, Kubo, S, additional, Ohkubo, K, additional, Sato, M, additional, Shimozuma, T, additional, Yoshimura, Y, additional, Ikeda, K, additional, Nagaoka, K, additional, Oka, Y, additional, Takeiri, Y, additional, Tsumori, K, additional, Ashikawa, N, additional, Emoto, M, additional, Funaba, H, additional, Goto, M, additional, Ida, K, additional, Kobuchi, T, additional, Liang, Y, additional, Masuzaki, S, additional, Minami, T, additional, Miyazawa, J, additional, Morisaki, T, additional, Muto, S, additional, Nakamura, Y, additional, Nakanishi, H, additional, Nishimura, K, additional, Noda, N, additional, Ohdachi, S, additional, Peterson, B J, additional, Sagara, A, additional, Sakakibara, S, additional, Sakamoto, R, additional, Sato, K, additional, Shoji, M, additional, Suzuki, H, additional, Tanaka, K, additional, Toi, K, additional, Tokuzawa, T, additional, Watanabe, K Y, additional, Yamada, I, additional, Yamamoto, S, additional, Yoshinuma, M, additional, Yokoyama, M, additional, Watanabe, K-Y, additional, Kaneko, O, additional, Kawahata, K, additional, Komori, A, additional, Ohyabu, N, additional, Yamada, H, additional, Yamazaki, K, additional, Sudo, S, additional, Matsuoka, K, additional, Hamada, Y, additional, Motojima, O, additional, Fujiwara, M, additional, and Group, the LHD Experimental, additional

Published
2003
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29. ICRF Antenna Characteristics and Comparison with 3-D Code Calculation in the LHD.

Author

Mutoh, T., Kasahara, H., Seki, T., Saito, K., Kumazawa, R., Shimpo, F., and Nomura, G.

Subjects
PLASMA gases, ION cyclotron resonance spectrometry, ANTENNAS (Electronics), PLASMA devices, SIMULATION methods & models
Abstract

The plasma coupling characteristics and local heat spots of an ion cyclotron range of frequencies (ICRF) antenna in the Large Helical Device (LHD) are compared with the results of 3-D computing simulator code calculation. We studied several dependences of antenna loading resistances with plasma experimentally and observed a clear relation between the maximum injection power and the loading resistance. Realistic three-dimensional configuration of the ICRF antenna was taken into account to simulate the coupling characteristics and the local heat absorption near the ICRF antenna, which has a helically twisted geometry in the LHD. The electromagnetic field distribution and the current distribution on the antenna strap were calculated. We compared the RF absorption distribution on the antenna structure with the temperature rise during steady state operation and found that the temperature rise was well explained by comparing with the model simulation. [ABSTRACT FROM AUTHOR]

Published
2009
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30. ICRF mode conversion heating and long-pulse discharges in LHD.

Author

Saito, K., Mutoh, T., Kumazawa, R., Seki, T., Nakamura, Y., Ashikawa, N., Sato, K., Shoji, M., Masuzaki, S., Ogawa, H., Takeuchi, H., Kasahara, H., Shimpo, F., Nomura, G., Yokota, M., Takahashi, C., and Komori, A.

Subjects
HEATING, PULSE (Heart beat), PARTICLES (Nuclear physics), ELECTRONS, ELECTRIC power
Abstract

In LHD, long-pulse discharge has been conducted by ICRF minority ion heating. Plasma duration time of 525 seconds was achieved with the heating power of more than 1 MW supported by ECH and NBI. Electron heating by the mode conversion from the fast wave to the ion Bernstein wave was investigated to achieve a longer pulse length with the higher injection power. Plasma was sustained for 88 seconds by the mode conversion heating and ECH. The temperature distribution on divertor plates was less localized than that of minority ion heating. [ABSTRACT FROM AUTHOR]

Published
2007
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31. Plasma production experiments using a folded waveguide antenna on LHD

Author

Torii, Y., primary, Kumazawa, R., additional, Seki, T., additional, Mutoh, T., additional, Watari, T., additional, Saito, K., additional, Yamamoto, T., additional, Takeuchi, N., additional, Cheng, Zhang, additional, Zhao, Yangping, additional, Shimpo, F., additional, Nomura, G., additional, Yokota, M., additional, Kato, A., additional, Nishimura, K., additional, Bigelow, T.S., additional, Rasmussen, D.A., additional, Goulding, R.H., additional, Carter, M.D., additional, Idei, H., additional, Ikeda, K., additional, Kaneko, O., additional, Kawahata, K., additional, Komori, A., additional, Kubo, S., additional, Miyazawa, J., additional, Morisaki, T., additional, Nakamura, Y., additional, Notake, T., additional, Ohkubo, K., additional, Ohyabu, N., additional, Oka, Y., additional, Osakabe, M., additional, Sato, M., additional, Shimozuma, T., additional, Takeiri, Y., additional, Tsumori, K., additional, Watanabe, T., additional, Yamada, H., additional, and Yoshimura, Y., additional

Published
2002
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32. The Analysis of ICRF Heating Experiment in View of the Confinement of High-energy Particles in LHD.

Author

Saito, K., Kumazawa, R., Mutoh, T., Seki, T., Watari, T., Shimpo, F., Nomura, G., Kato, A., Yokota, M., Isobe, M., Ozaki, T., Osakabe, M., Sasao, M., Saida, T., Yamamoto, T., Torii, Y., and Takeuchi, N.

Subjects
PARTICLES (Nuclear physics), PLASMA confinement, PLASMA heating, CYCLOTRON resonance, MAGNETIC fields, PLASMA gases
Abstract

The confinement of high-energy particles produced by ICRF heating was studied in LHD experimentally setting magnetic axis at 3.6m and 3.75m in two methods. It was concluded that the confinement of high-energy particles with Rax=3.6 m was better than that with Rax=3.75m. Based on this result the long pulse experiments were conducted in the magnetic configuration of Rax=3.6m. The plasma was sustained for 150sec. The total input power reached 71MJ though the pulse length was limited by the collapse of plasma due to density increase. The second harmonic experiment was done also with Rax=3.6m. The stored energy increased and the particles with the high-energy were observed. © 2003 American Institute of Physics [ABSTRACT FROM AUTHOR]

Published
2003
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33. A study of high-energy ions produced by ICRF heating in LHD

Author

Saito, K, primary, Kumazawa, R, additional, Mutoh, T, additional, Seki, T, additional, Watari, T, additional, Yamamoto, T, additional, Torii, Y, additional, Takeuchi, N, additional, Zhang, C, additional, Zhao, Y, additional, Fukuyama, A, additional, Shimpo, F, additional, Nomura, G, additional, Yokota, M, additional, Kato, A, additional, Sasao, M, additional, Isobe, M, additional, Krasilnikov, A V, additional, Ozaki, T, additional, Osakabe, M, additional, Narihara, K, additional, Nagayama, Y, additional, Inagaki, S, additional, Itoh, K, additional, Ido, T, additional, Morita, S, additional, Ohkubo, K, additional, Sato, M, additional, Kubo, S, additional, Shimozuma, T, additional, Idei, H, additional, Yoshimura, Y, additional, Notake, T, additional, Kaneko, O, additional, Takeiri, Y, additional, Oka, Y, additional, Tsumori, K, additional, Ikeda, K, additional, Komori, A, additional, Yamada, H, additional, Funaba, H, additional, Watanabe, K Y, additional, Sakakibara, S, additional, Sakamoto, R, additional, Miyazawa, J, additional, Tanaka, K, additional, Peterson, B J, additional, Ashikawa, N, additional, Murakami, S, additional, Minami, T, additional, Shoji, M, additional, Ohdachi, S, additional, Yamamoto, S, additional, Suzuki, H, additional, Kawahata, K, additional, Emoto, M, additional, Nakanishi, H, additional, Inoue, N, additional, Ohyabu, N, additional, Nakamura, Y, additional, Masuzaki, S, additional, Muto, S, additional, Sato, K, additional, Morisaki, T, additional, Yokoyama, M, additional, Watanabe, T, additional, Goto, M, additional, Yamada, I, additional, Ida, K, additional, Tokuzawa, T, additional, Noda, N, additional, Toi, K, additional, Yamaguchi, S, additional, Akaishi, K, additional, Sagara, A, additional, Nishimura, K, additional, Yamazaki, K, additional, Sudo, S, additional, Hamada, Y, additional, Motojima, O, additional, and Fujiwara, M, additional

Published
2001
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34. Derivation of energy confinement time and ICRF absorption in LHD by power modulation

Author

Torii, Y, primary, Watari, T, additional, Kumazawa, R, additional, Saito, K, additional, Mutoh, T, additional, Seki, T, additional, Shimpo, F, additional, Nomura, G, additional, Watanabe, T, additional, Takeuchi, N, additional, Yamamoto, T, additional, Zhao, Y, additional, Hartmann, D A, additional, Yamada, H, additional, Ozaki, T, additional, Masuzaki, S, additional, Tanaka, K, additional, Yokota, M, additional, Katoh, A, additional, Akaishi, K, additional, Ashikawa, N, additional, Vries, P de, 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, Itoh, K, additional, Kado, S, additional, Kaneko, O, additional, Kawahata, K, additional, Kobuchi, T, additional, Komori, A, additional, Krasilnikov, A V, additional, Kubo, S, additional, Minami, T, additional, Miyazawa, J, additional, Morisaki, T, additional, Morita, S, additional, Murakami, S, additional, Muto, S, additional, Nagayama, Y, additional, Nakamura, Y, additional, Nakanishi, H, additional, Narihara, K, additional, Nishimura, K, additional, Noda, N, additional, Ohdachi, S, additional, Ohkubo, K, additional, Ohyabu, N, additional, Oka, Y, additional, Osakabe, M, 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, Shimozuma, T, additional, Shoji, M, additional, Sudo, S, additional, Takeiri, Y, additional, Toi, K, additional, Tokuzawa, T, additional, Tsumori, K, additional, Watanabe, K Y, additional, Suzuki, H, additional, Yamada, I, additional, Hamada, Y, additional, Yamaguchi, S, additional, Yamamoto, S, additional, Yamazaki, K, additional, Yokoyama, M, additional, Yoshimura, Y, additional, Motojima, O, additional, and Fujiwara, M, additional

Published
2001
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35. Ion and electron heating in ICRF heating experiments on LHD

Author

Saito, K., primary, Kumazawa, R., additional, Mutoh, T., additional, Seki, T., additional, Watari, T., additional, Torii, Y., additional, Hartmann, D.A., additional, Zhao, Y., additional, Fukuyama, A., additional, Shimpo, F., additional, Nomura, G., additional, Yokota, M., additional, Sasao, M., additional, Isobe, M., additional, Osakabe, M., additional, Ozaki, T., additional, Narihara, K., additional, Nagayama, Y., additional, Inagaki, S., additional, Itoh, K., additional, Morita, S., additional, Krasilnikov, A.V., additional, Ohkubo, K., additional, Sato, M., additional, Kubo, S., additional, Shimozuma, T., additional, Idei, H., additional, Yoshimura, Y., additional, Kaneko, O., additional, Takeiri, Y., additional, Oka, Y., additional, Tsumori, K., additional, Ikeda, K., additional, Komori, A., additional, Yamada, H., additional, Funaba, H., additional, Watanabe, K.Y., additional, Sakakibara, S., additional, Shoji, M., additional, Sakamoto, R., additional, Miyazawa, J., additional, Tanaka, K., additional, Peterson, B.J., additional, Ashikawa, N., additional, Murakami, S., additional, Minami, T., additional, Ohdachi, S., additional, Yamamoto, S., additional, Kado, S., additional, Sasao, H., additional, Suzuki, H., additional, Kawahata, K., additional, Vries, P. de, additional, Emoto, M., additional, Nakanishi, H., additional, Kobuchi, T., additional, Inoue, N., additional, Ohyabu, N., additional, Nakamura, Y., additional, Masuzaki, S., additional, Muto, S., additional, Sato, K., additional, Morisaki, T., additional, Yokoyama, M., additional, Watanabe, T., additional, Goto, M., additional, Yamada, I., additional, Ida, K., additional, Tokuzawa, T., additional, Noda, N., additional, Yamaguchi, S., additional, Akaishi, K., additional, Sagara, A., additional, Toi, K., additional, Nishimura, K., additional, Yamazaki, K., additional, Sudo, S., additional, Hamada, Y., additional, Motojima, O., additional, and Fujiwara, M., additional

Published
2001
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36. Liquid impedance matching system for ion cyclotron heating

Author

Saito, K., primary, Torii, Y., additional, Kumazawa, R., additional, Mutoh, T., additional, Seki, T., additional, Shimpo, F., additional, Nomura, G., additional, Yokota, M., additional, Watari, T., additional, Cattanei, G., additional, and Zhao, Yangping, additional

Published
2001
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37. Feedback control impedance matching system using liquid stub tuner for ion cyclotron heating.

Author

Nomura, G., Yokota, M., Kumazawa, R., Takahashi, C., Torii, Y., Saito, K., Yamamoto, T., Takeuchi, N., Shimpo, F., Kato, A., Seki, T., Mutoh, T., Watari, T., and Zhao, Y.

Subjects
FEEDBACK control systems, ELECTRIC impedance, ION acoustic waves
Abstract

A long pulse discharge more than 2 minutes was achieved using Ion Cyclotron Range of Frequency (ICRF) heating only on the Large Helical Device (LHD). The final goal is a steady state operation (30 minutes) at MW level. A liquid stub tuner was newly invented to cope with the long pulse discharge. The liquid surface level was shifted under a high RF voltage operation without breakdown. In the long pulse discharge the reflected power was observed to gradually increase. The shift of the liquid surface was thought to be inevitably required at the further longer discharge. An ICRF heating system consisting of a liquid stub tuner was fabricated to demonstrate a feedback control impedance matching. The required shift of the liquid surface was predicted using a forward and a reflected RF powers as well as the phase difference between them. A liquid stub tuner was controlled by the multiprocessing computer system with CINOS (CHS Integration No Operating System) methods. The prime objective was to improve the performance of data processing and controlling a signal response. By employing this method a number of the program steps was remarkably reduced. A real time feedback control was demonstrated in the system using a temporally changed electric resistance. [ABSTRACT FROM AUTHOR]

Published
2001

38. High power ICRF heating experiment in LHD.

Author

Seki, T., Kumazawa, R., Mutoh, T., Watari, T., Shimpo, F., Nomura, G., Kato, A., Yokota, M., Saito, K., Torii, Y., Yamamoto, T., Takeuchi, N., and Cheng, Z.

Subjects
ION acoustic waves, PLASMA heating, ION cyclotron resonance spectrometry
Abstract

Heating experiment using high-power ion cyclotron range of frequency (ICRF) waves has been carried out and remarkable results as an ICRF heating in helical system were obtained in LHD. The maximum ICRF power was 2.7 MW. Good heating condition was obtained when the ion cyclotron resonance layer was located near the saddle point of the magnetic field. In this condition, the wave frequency is 38.47 MHz and strength of magnetic field is 2.75 T. Most of ICRF power was absorbed by ions and behavior of high-energy ions was investigated in the various heating conditions. The stored energy more than 1 MJ was achieved by combination of the ICRF heating with NBI heating. Fundamental cyclotron heating was observed in the high stored energy experiment. Second harmonic heating regime was shown to be useful heating scheme in LHD. The length of the ICRF pulse was extended to more than two minutes in the low power operation. [ABSTRACT FROM AUTHOR]

Published
2001

39. Ion Heating and High-Energy-Particle Production by Ion-Cyclotron Heating in the Large Helical Device

Author

Mutoh, T., primary, Kumazawa, R., additional, Seki, T., additional, Watari, T., additional, Saito, K., additional, Torii, Y., additional, Hartmann, D. A., additional, Zhao, Y., additional, Sasao, M., additional, Isobe, M., additional, Osakabe, M., additional, Krasilnikov, A. V., additional, Ozaki, T., additional, Narihara, K., additional, Nagayama, Y., additional, Inagaki, S., additional, Shimpo, F., additional, Nomura, G., additional, Yokota, M., additional, Akaishi, K., additional, Ashikawa, N., additional, de Vries, P., additional, Emoto, M., additional, Funaba, H., additional, Fukuyama, A., additional, Goto, M., additional, Ida, K., additional, Idei, H., additional, Ikeda, K., additional, Inoue, N., additional, Itoh, K., additional, Kaneko, O., additional, Kawahata, K., additional, Kado, S., additional, Komori, A., additional, Kobuchi, T., additional, Kubo, S., additional, Masuzaki, S., additional, Morisaki, T., additional, Morita, S., additional, Miyazawa, J., additional, Murakami, S., additional, Minami, T., additional, Muto, S., additional, Nakamura, Y., additional, Nakanishi, H., additional, Noda, N., additional, Nishimura, K., additional, Ohkubo, K., additional, Ohyabu, N., additional, Ohdachi, S., additional, Oka, Y., additional, Okada, H., additional, Peterson, B. J., additional, Sagara, A., additional, Sato, K., additional, Sakakibara, S., additional, Sakamoto, R., additional, Sasao, H., additional, Sato, M., additional, Shimozuma, T., additional, Shoji, M., additional, Sudo, S., additional, Suzuki, H., additional, Takeiri, Y., additional, Tanaka, K., additional, Toi, K., additional, Tokuzawa, T., additional, Tsumori, K., additional, Watanabe, K. Y., additional, Watanabe, T., additional, Yamada, H., additional, Yamada, I., additional, Yamaguchi, S., additional, Yamazaki, K., additional, Yokoyama, M., additional, Yoshimura, Y., additional, Hamada, Y., additional, Motojima, O., additional, and Fujiwara, M., additional

Published
2000
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40. The first ICRF heating experiment in the large helical device

Author

Mutoh, T, primary, Kumazawa, R, additional, Seki, T, additional, Saito, K, additional, Shimpo, F, additional, Nomura, G, additional, Watari, T, additional, Jikang, X, additional, Cattanei, G, additional, Okada, H, additional, Ohkubo, K, additional, Sato, M, additional, Kubo, S, additional, Shimozuma, T, additional, Idei, H, additional, Yoshimura, Y, additional, Kaneko, O, additional, Takeiri, Y, additional, Osakabe, M, additional, Oka, Y, additional, Tsumori, K, additional, Komori, A, additional, Yamada, H, additional, Watanabe, K Y, additional, Sakakibara, S, additional, Shoji, M, additional, Sakamoto, R, additional, Inagaki, S, additional, Miyazawa, J, additional, Morita, S, additional, Tanaka, K, additional, Peterson, B J, additional, Murakami, S, additional, Minami, T, additional, Ohdachi, S, additional, Kado, S, additional, Narihara, K, additional, Sasao, H, additional, Suzuki, H, additional, Kawahata, K, additional, Ohyabu, N, additional, Nakamura, Y, additional, Funaba, H, additional, Masuzaki, S, additional, Muto, S, additional, Sato, K, additional, Morisaki, T, additional, Sudo, S, additional, Nagayama, Y, additional, Watanabe, T, additional, Sasao, M, additional, Goto, M, additional, Yamada, I, additional, Tokuzawa, T, additional, Ida, K, additional, Noda, N, additional, Yamazaki, K, additional, Akaishi, K, additional, Sagara, A, additional, Nishimura, K, additional, Ozaki, T, additional, Toi, K, additional, Motojima, O, additional, and Fujiwara, M, additional

Published
2000
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41. Initial ICRF heating experiments on the LHD

Author

Kumazawa, R., primary, Mutoh, T., additional, Seki, T., additional, Saito, K., additional, Shimpo, F., additional, Nomura, G., additional, Ido, T., additional, Watari, T., additional, Cattanei, G., additional, Jikang, Xie, additional, Okada, H., additional, Ohkubo, K., additional, Sato, M., additional, Kubo, S, additional, Shimozuma, T., additional, Idei, H., additional, Yoshimura, Y., additional, Kaneko, O., additional, Takeiri, Y., additional, Oka, Y., additional, Tsumori, K., additional, Osakabe, M., additional, Ohyabu, N., additional, Kawahata, K., additional, Komori, A., additional, Yamada, H., additional, Akaishi, K., additional, Emoto, M., additional, Funaba, H., additional, Goto, M., additional, Hamada, Y., additional, Ida, K., additional, Inagaki, S., additional, Inoue, N., additional, Kado, S., additional, Masuzaki, S., additional, Minami, T., additional, Miyazawa, J., additional, Morisaki, T., additional, Morita, S., additional, Murakami, S., additional, Muto, S., 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, Ozaki, T., additional, Peterson, B. J., additional, Sagara, A., additional, Sasakibara, S., additional, Sakamoto, R., additional, Sasao, H., additional, Sasao, M., additional, Sato, K., additional, Shoji, M., additional, Sudo, S., additional, Suzuki, H., additional, Tanaka, K., additional, Toi, K., additional, Tokuzawa, T., additional, Tsuzuki, K., additional, Yamada, I., additional, Yamaguchi, S., additional, Yokoyama, M., additional, Watanabe, K. Y., additional, Motojima, O., additional, Fujiwara, M., additional, and Iiyoshi, A., additional

Published
1999
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44. High frequency ion Bernstein wave heating experiment in the JIPP T-IIU tokamak

Author

Seki, T, primary, Kumazawa, R, additional, Watari, T, additional, Ono, M, additional, Yasaka, Y, additional, Shimpo, F, additional, Ando, A, additional, Kaneko, O, additional, Oka, Y, additional, Adati, K, additional, Akiyama, R, additional, Hamada, Y, additional, Hidekuma, S, additional, Hirokura, S, additional, Ida, K, additional, Karita, A, additional, Kawahata, K, additional, Kawamoto, T, additional, Kawasumi, Y, additional, Kitoh, Y, additional, Kojima, M, additional, Masai, K, additional, Morita, S, additional, Narihara, K, additional, Ogawa, Y, additional, Ohkubo, K, additional, Okajima, S, additional, Ozaki, T, additional, Sakamoto, M, additional, Sasao, M, additional, Sato, K, additional, Sato, K.N, additional, Takahashi, H, additional, Taniguchi, Y, additional, Toi, K, additional, and Tsuzuki, T, additional

Published
1992
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45. Observation of toroidal plasma rotation driven by the electric field induced by loss of ions

Author

Ida, K., primary, Kawahata, K., additional, Toi, K., additional, Watari, T., additional, Kaneko, O., additional, Ogawa, Y., additional, Sanuki, H., additional, Adati, K., additional, Akiyama, R., additional, Ando, A., additional, Ando, R., additional, Hamada, Y., additional, Hidekuma, S., additional, Hirokura, S., additional, Karita, A., additional, Kawamoto, T., additional, Kawasumi, Y., additional, Kojima, M., additional, Kumazawa, R., additional, Kuroda, T., additional, Masai, K., additional, Morita, S., additional, Narihara, K., additional, Ohkubo, K., additional, Oka, Y., additional, Okajama, S., additional, Ozaki, T., additional, Sakamoto, M., additional, Sasao, M., additional, Sato, K., additional, Sato, K.N., additional, Seki, T., additional, Shimpo, F., additional, Taniguchi, Y., additional, Tsuzuki, T., additional, and Yamada, H., additional

Published
1991
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46. Fast wave heating at intermediate ion cyclotron harmonics on the JIPP T-IIU tokamak

Author

Takase, Y., primary, Watari, T., additional, Kumazawa, R., additional, Seki, T., additional, Adati, K., additional, Ando, R., additional, Aoki, T., additional, Hamada, Y., additional, Hirokura, S., additional, Ida, K., additional, Kako, E., additional, Kawahata, K., additional, Kawasumi, Y., additional, Masai, K., additional, Narihara, K., additional, Ohkubo, K., additional, Sakamoto, M., additional, Shimpo, F., additional, Taniguchi, Y., additional, Toi, K., additional, and Tsuzuki, T., additional

Published
1990
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47. Role of edge magnetic shear on the limiterH-mode transition of the JIPP T-IIU tokamak

Author

Toi, K., primary, Kawahata, K., additional, Morita, S., additional, Watari, T., additional, Kumazawa, R., additional, Ida, K., additional, Ando, A., additional, Oka, Y., additional, Sakamoto, M., additional, Hamada, Y., additional, Adati, K., additional, Ando, R., additional, Aoki, T., additional, Hidekuma, S., additional, Hirokura, S., additional, Kaneko, O., additional, Karita, A., additional, Kawamoto, T., additional, Kawasumi, Y., additional, Kuroda, T., additional, Masai, K., additional, Narihara, K., additional, Ogawa, Y., additional, Ohkubo, K., additional, Okajima, S., additional, Ozaki, T., additional, Sasao, M., additional, Sato, K. N., additional, Seki, T., additional, Shimpo, F., additional, Takahashi, H., additional, Tanahashi, S., additional, Taniguchi, Y., additional, and Tsuzuki, T., additional

Published
1990
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48. Ion cyclotron range of frequency heating experiments on the large helical device and high energy ion behavior.

Author

Kumazawa, R., Mutoh, T., Seki, T., Watari, T., Saito, K., Torii, Y., Shimpo, F., Nomura, G., Yokota, M., Kato, A., Hartmann, D. A., Zhao, Y., Fukuyama, A., Okada, H., Ohkubo, K., Sato, M., Kubo, S., Shimozuma, T., Idei, H., and Yoshimura, Y.

Subjects
PLASMA gases, CYCLOTRONS
Abstract

Ion cyclotron range of frequency (ICRF) heating experiments on the Large Helical Device (LHD) [O. Motojima et al. Fus. Eng. Des. 20, 3 (1993)] achieved significant advances during the third experimental campaign carried out in 1999. They showed significant results in two heating modes; these are modes of the ICH-sustained plasma with large plasma stored energy and the neutral beam injection (NBI) plasma under additional heating. A long-pulse operation of more than 1 minute was achieved ata level of 1 MW. The characteristics of the ICRF heated plasma are the same as those of the NBI heated plasma. The energy confinement time is longer than that of International Stellarator Scaling 95. Three keys to successful ICRF heating are as follows: (1) an increase in the magnetic field strength, (2) the employment of an inward shift of the magnetic axis, (3) the installation of actively cooled graphite plates along the divertor legs. Highly energetic protons accelerated by the ICRF electric field were experimentally observed in the energy range from 30 to 250 keV and the tail temperature depended on the energy balance between the wave heating and the electron drag. The transfer efficiency from the high energy ions to the bulk plasma was deduced from the increase in the energy confinement time due to the high energy ions in the lower density discharge, which agrees fairly well with the result obtained by the Monte Carlo simulation. The transfer efficiency is expected to be 95% at an electron density of more than n[sub e] = 5.0 × 10[sup 19] m[sup -3] even in the high power heating of 10 MW. The accumulation of impurities, e.g., FeXVI and OV was not observed in high rf power and long pulse operation. The well-defined divertor intrinsic to LHD is believed to be useful in reducing the impurity influx. [ABSTRACT FROM AUTHOR]

Published
2001

49. ICRF Heating System in LHD

Author

Mutoh, T., Kumazawa, R., Seki, T., Saito, K., Kasahara, H., Shimpo, F., and Nomura, G.

Abstract

AbstractA heating system for the Large Helical Device (LHD) based on the ion cyclotron range of frequencies (ICRF) heating is reviewed. Various physical and engineering issues were studied and solved to construct an effective and stable system for high-power, steady-state experiments in LHD. Successful results were achieved using six loop antennas. The physical design of the ICRF antenna was an important subject during the research and development phase. A single current strap antenna was adopted to maintain high coupling resistance. The antenna designed to conform to the LHD plasma shape provided effective plasma heating. Steady-state operation is one of the most important mission items of superconducting LHD device. Many ICRF components, including the transmitter, transmission line, impedance matching tuner, feedthrough ceramics, and antenna launcher, were developed and applied in long-pulse experiments. All components are water cooled to remove the heat loss during the operation. Especially, a liquid stub impedance tuner using dielectric liquid was developed and implemented for the first time in a plasma experiment. An antenna launcher was also designed with the ability to change its position during the steady-state operation. Steady-state operation for 54 min with an input energy of 1.6 GJ was achieved, the largest input energy on record for a toroidal plasma device.

Published
2010
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50. Study of Long-Pulse Plasma Experiment Using ICRF Heating in LHD

Author

Seki, T., Mutoh, T., Kumazawa, R., Saito, K., Nakamura, Y., Sakamoto, M., Watanabe, T., Kubo, S., Shimozuma, T., Yoshimura, Y., Igami, H., Ohkubo, K., Takeiri, Y., Oka, Y., Tsumori, K., Osakabe, M., Ikeda, K., Nagaoka, K., Kaneko, O., Miyazawa, J., Morita, S., Narihara, K., Shoji, M., Masuzaki, S., Goto, M., Morisaki, T., Peterson, B. J., Sato, K., Tokuzawa, T., Ashikawa, N., Nishimura, K., Funaba, H., Chikaraishi, H., Takeuchi, N., Notake, T., Ogawa, H., Torii, Y., Shimpo, F., Nomura, G., Yokota, M., Takahashi, C., Kato, A., Takase, Y., Kasahara, H., Ichimura, M., Higaki, H., Zhao, Y. P., Kwak, J. G., Yamada, H., Kawahata, K., Ohyabu, N., Ida, K., Nagayama, Y., Noda, N., Watari, T., Komori, A., Sudo, S., and Motojima, O.

Abstract

AbstractThe long-pulse plasma discharge experiment is an important experiment in the Large Helical Device, which has a superconducting coil system and the capability of steady-state operation. The experiment of long-pulse plasma discharge was carried out using mainly ion cyclotron range of frequencies heating. The maximum plasma duration is 31 min and 45 s, and the total injected heating energy reached 1.3 GJ. Swing of the magnetic axis is adopted as an effective method to scatter the local heat load on the divertor plate during the discharge. The plasma was terminated abruptly by the influx of metallic impurities accompanied by a spark in the vacuum vessel.

Published
2006
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