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152. Third harmonic ICRF heating in LHD hydrogen experiments.

Author

S. Kamio, T. Seki, K. Saito, H. Kasahara, G. Nomura, Group, The L. H. D. Experiment, R. Seki, S. Sakakibara, and T. Mutoh

Subjects
HYDROGEN, NUCLEAR fusion, ELECTRON cyclotron resonance heating, THIRD harmonic generation, SIMULATION methods & models
Abstract

The ion cyclotron range of frequencies (ICRF) heating power injection in the hydrogen experiment in LHD was demonstrated after the upgrade of ICRF antennas. The ICRF wave couples and accelerates the energetic particles injected by perpendicular-NBIs with 40 keV. The simulation by the MORH code shows the existence of energetic particles around the ICRF third harmonic resonance layers. As the result of ICRF heating power deposition, the beta value increased by 0.2% in absolute beta mainly due to the increased energetic particle content. The increase of energetic ions particularly around 60 keV, which should be accelerated by the ICRF heating, is observed. The ICRF heating efficiency was approximately 30%–50%, estimated from the break-in-slope analysis at the turn off timing of ICRF power from the stored energy measured by diamagnetic loops. This increase of the stored energy is mostly the contribution of the increased energetic particles. The heating efficiency increases as the density increases. [ABSTRACT FROM AUTHOR]

Published
2018
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164. ESTIMATE OF THE ELECTRON POWER DEPOSITION PROFILE IN CHS

Author

K. Matsuoka, T. Minami, Kunizo Ohkubo, H. Iguchi, K. Narihara, Katsumi Ida, K. Nishimura, S. Kubo, Shoichi Okamura, M. Iwase, T. Mutoh, T. Watari, R. Kumazawa, I. Yamada, and Hiroshi Idei

Subjects
Range (particle radiation), Materials science, Thomson scattering, Cyclotron, General Engineering, Electron, Electron cyclotron resonance, law.invention, Ion, Physics::Plasma Physics, law, Harmonic, Electron temperature, Atomic physics
Abstract

The electron power deposition profile has been estimated experimentally during the ion cyclotron range of frequency (ICRF) heating and the electron cyclotron resonance heating (ECRH) in the compact helical system (CHS). The time evolution of the local electron temperature is measured from the second harmonic electron cyclotron emission (ECE) using super heterodyne radiometer. The absorbed power by electrons has been derived from the change in the slopes of the local electron temperature just before and after the input power is turned off. The power deposition profiles of electrons are compared with results from the calculation code in ICRF experiment. Those results show good agreement. In the ECRH experiment the input power is modulated to reduce the power deposition profile. Those analyses give results that the input power is absorbed around {rho}=0.6. 4 refs., 4 figs.

167. CENTRAL ELECTRON TEMPERATURE MEASUREMENT BY THIRD-HARMONIC ELECTRON-CYCLOTRON EMISSION FROM THE HELIOTRON-ECURRENTLESS PLASMA

Author

Koji Uo, Osamu Motojima, J. N. Talmadge, S. Sudo, Tokuhiro Obiki, A. Iiyoshi, Hideki Zushi, Masahide Sato, and T. Mutoh

Subjects
Physics, Electron density, Thomson scattering, Bremsstrahlung, Electron temperature, General Physics and Astronomy, Plasma diagnostics, Electron, Cyclotron radiation, Inelastic scattering, Atomic physics
Abstract

The dependence of the optically thin third-harmonic emission on the electron density and temperature was observed to be in good agreement with theory. A one-dimensional model is used to show that the effect on calculating the central electron temperature of density profile variations is minimal, while that of temperature profile changes is small if the variations are within reasonable limits. Comparison of the temperature evolution calculated by use of the third-harmonic emission with shot-to-shot Thomson scattering shows very good agreement.

Published
1984

168. Folded Waveguide Antenna for the LHD

Author

R., Kumazawa, T., Morisaki, T., Mutoh, T., Seki, T., Watari, F., Shinbo, G., Nomura, S., Masuda, T., Ido, H., Yonezu, H., Kojima, T.S., Bigelow, D.A., Rasmussen, M.D., Carter, and D.J., Hoffman

173. Development of High Beta Plasma Formation Using ICRF High Harmonic Fast Wave

Author

Y., Takase, A., Ejiri, Y., Ono, H., Tojo, T., Masuda, T., Oosako, J., Sugiyama, E., Kawamori, Y., Torii, M., Sasaki, S., Kainaga, N., Nishino, O., Mitarai, A., Fukuyama, T., Maekawa, H., Tanaka, K., Hanada, H., Idei, T., Yamada, T., Mutoh, R., Kumazawa, T., Seki, K., Saito, H., Kasahara, K., Kawahata, K., Tanaka, and T., Tokuzawa

174. Construction and Development of Long Term Sustained Spherical Tokamak 'QUEST' in Kyushu University

Author

K.N., \\'Sato, H., Zushi, K., Hanada, K., Nakamura, M., Sakamoto, H., Idei, M., Hasegawa, S., Kawasaki, H., Nakashima, A., Higashijima, N., Yoshida, H., Tokunaga, Y., Takase, Y., Ono, Y., Ogawa, A., Ando, T., Oono, T., Maekawa, A., Ishida, M., Nagata, N., Nishino, O., Mitarai, N., Asakura, M., Matsukawa, K., Shimizu, S., Nishio, Y., Nakamura, Y., Nagayama, Y., Hirooka, T., Mutoh, Y., Takeiri, O., Kaneko, H., Yamada, A., Komori, and Y.\\', Kishimoto

193. Study of Optimization of the ICRF Heating in Heliotron J

Author

T., \\'Mutoh, R., Kumazawa, T., Seki, K., Saito, H., Kasahara, H., Okada, F., Sano, K., Hanatani, T., Mizuuchi, T., Minami, S., Kobayashi, K., Nagasaki, S., Yamamoto, S., Konoshima, M., Takeuchi, S., Ohshima, Y., Nakamura, K., Mukai, and H.Y.\\', Lee

198. Development of a Fast Wave Current Drive Antenna

Author

Y., Takase, N., Kasuya, H., Nozato, H., Kasahara, T., Taniguchi, D., Iijima, Y., Kobori, T., Nishi, N., Ohara, M., Aramasu, M., Saigusa, T., Seki, R., Kumazawa, T., Mutoh, T., Watari, K., Saito, H., Torii, T., Yamamoto, and N., Takeuchi

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