Extension and characteristics of an ECRH plasma in LHD

S. Kubo; T. Shimozuma; Y. Yoshimura; T. Notake; H. Idei; Inagaki Shigeru; M. Yokoyama; K. Ohkubo; R. Kumazawa; Y. Nakamura; K. Saito; T. Seki; T. Mutoh; T. Watari; K. Narihara; I. Yamada; K. Ida; Y. Takeiri; H. Funaba; N. Ohyabu; K. Kawahata; O. Kaneko; H. Yamada; K. Itoh; N. Ashikawa; M. Emoto; M. Goto; Y. Hamada; T. Ido; K. Ikeda; M. Isobe; K. Khlopenkov; T. Kobuchi; S. Masuzaki; T. Minami; J. Miyazawa; T. Morisaki; S. Morita; S. Murakami; S. Muto; K. Nagaoka; Y. Nagayama; H. Nakanishi; Y. Narushima; K. Nishimura; M. Nishiura; N. Noda; S. Ohdachi; Y. Oka; M. Osakabe; T. Ozaki; B. J. Peterson; A. Sagara; S. Sakakibara; R. Sakamoto; M. Shoji; S. Sudo; N. Takeuchi; N. Tamura; K. Tanaka; K. Toi; T. Tokuzawa; K. Tsumori; K. Watanabe; T. Watanabe; K. Yamazaki; M. Yoshinuma; A. Komori; O. Motojima

doi:10.1088/0741-3335/47/5A/008

Extension and characteristics of an ECRH plasma in LHD

S. Kubo, T. Shimozuma, Y. Yoshimura, T. Notake, H. Idei, Inagaki Shigeru, M. Yokoyama, K. Ohkubo, R. Kumazawa, Y. Nakamura, K. Saito, T. Seki, T. Mutoh, T. Watari, K. Narihara, I. Yamada, K. Ida, Y. Takeiri, H. Funaba, N. OhyabuK. Kawahata, O. Kaneko, H. Yamada, K. Itoh, N. Ashikawa, M. Emoto, M. Goto, Y. Hamada, T. Ido, K. Ikeda, M. Isobe, K. Khlopenkov, T. Kobuchi, S. Masuzaki, T. Minami, J. Miyazawa, T. Morisaki, S. Morita, S. Murakami, S. Muto, K. Nagaoka, Y. Nagayama, H. Nakanishi, Y. Narushima, K. Nishimura, M. Nishiura, N. Noda, S. Ohdachi, Y. Oka, M. Osakabe, T. Ozaki, B. J. Peterson, A. Sagara, S. Sakakibara, R. Sakamoto, M. Shoji, S. Sudo, N. Takeuchi, N. Tamura, K. Tanaka, K. Toi, T. Tokuzawa, K. Tsumori, K. Watanabe, T. Watanabe, K. Yamazaki, M. Yoshinuma, A. Komori, O. Motojima

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Abstract

One of the main objectives of LHD is to extend the plasma confinement database for helical systems and to demonstrate such extended plasma confinement properties to be sustained in the 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 LHD plasma from the initial operation. The system optimizations including the modification of the transmission and antenna system are performed with special emphasis on the local heating properties. As a result, a central electron temperature of more than 10 keV with an electron density of 0.6 × 10¹⁹ 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. The 168 GHz ECRH system demonstrated efficient heating at densities more than 1.0 × 10 ²⁰ m^-3. The continuous wave ECRH system is successfully operated to sustain a 756 s discharge.

Original language	English
Article number	008
Pages (from-to)	A81-A90
Journal	Plasma Physics and Controlled Fusion
Volume	47
Issue number	5 A
DOIs	https://doi.org/10.1088/0741-3335/47/5A/008
Publication status	Published - May 1 2005

All Science Journal Classification (ASJC) codes

Nuclear Energy and Engineering
Condensed Matter Physics

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10.1088/0741-3335/47/5A/008

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Kubo, S., Shimozuma, T., Yoshimura, Y., Notake, T., Idei, H., Shigeru, I., 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., ... Motojima, O. (2005). Extension and characteristics of an ECRH plasma in LHD. Plasma Physics and Controlled Fusion, 47(5 A), A81-A90. [008]. https://doi.org/10.1088/0741-3335/47/5A/008

Kubo, S, Shimozuma, T, Yoshimura, Y, Notake, T, Idei, H, Shigeru, I, 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, Peterson, BJ, 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 2005, 'Extension and characteristics of an ECRH plasma in LHD', Plasma Physics and Controlled Fusion, vol. 47, no. 5 A, 008, pp. A81-A90. https://doi.org/10.1088/0741-3335/47/5A/008

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title = "Extension and characteristics of an ECRH plasma in LHD",

abstract = "One of the main objectives of LHD is to extend the plasma confinement database for helical systems and to demonstrate such extended plasma confinement properties to be sustained in the 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 LHD plasma from the initial operation. The system optimizations including the modification of the transmission and antenna system are performed with special emphasis on the local heating properties. As a result, a central electron temperature of more than 10 keV with an electron density of 0.6 × 1019 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. The 168 GHz ECRH system demonstrated efficient heating at densities more than 1.0 × 10 20 m-3. The continuous wave ECRH system is successfully operated to sustain a 756 s discharge.",

author = "S. Kubo and T. Shimozuma and Y. Yoshimura and T. Notake and H. Idei and Inagaki Shigeru and M. Yokoyama and K. Ohkubo and R. Kumazawa and Y. Nakamura and K. Saito and T. Seki and T. Mutoh and T. Watari and K. Narihara and I. Yamada and K. Ida and Y. Takeiri and H. Funaba and N. Ohyabu and K. Kawahata and O. Kaneko and H. Yamada and K. Itoh and N. Ashikawa and M. Emoto and M. Goto and Y. Hamada and T. Ido and K. Ikeda and M. Isobe and K. Khlopenkov and T. Kobuchi and S. Masuzaki and T. Minami and J. Miyazawa and T. Morisaki and S. Morita and S. Murakami and S. Muto and K. Nagaoka and Y. Nagayama and H. Nakanishi and Y. Narushima and K. Nishimura and M. Nishiura and N. Noda and S. Ohdachi and Y. Oka and M. Osakabe and T. Ozaki and Peterson, {B. J.} and A. Sagara and S. Sakakibara and R. Sakamoto and M. Shoji and S. Sudo and N. Takeuchi and N. Tamura and K. Tanaka and K. Toi and T. Tokuzawa and K. Tsumori and K. Watanabe and T. Watanabe and K. Yamazaki and M. Yoshinuma and A. Komori and O. Motojima",

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T1 - Extension and characteristics of an ECRH plasma in LHD

AU - Kubo, S.

AU - Shimozuma, T.

AU - Yoshimura, Y.

AU - Notake, T.

AU - Idei, H.

AU - Shigeru, Inagaki

AU - Yokoyama, M.

AU - Ohkubo, K.

AU - Kumazawa, R.

AU - Nakamura, Y.

AU - Saito, K.

AU - Seki, T.

AU - Mutoh, T.

AU - Watari, T.

AU - Narihara, K.

AU - Yamada, I.

AU - Ida, K.

AU - Takeiri, Y.

AU - Funaba, H.

AU - Ohyabu, N.

AU - Kawahata, K.

AU - Kaneko, O.

AU - Yamada, H.

AU - Itoh, K.

AU - Ashikawa, N.

AU - Emoto, M.

AU - Goto, M.

AU - Hamada, Y.

AU - Ido, T.

AU - Ikeda, K.

AU - Isobe, M.

AU - Khlopenkov, K.

AU - Kobuchi, T.

AU - Masuzaki, S.

AU - Minami, T.

AU - Miyazawa, J.

AU - Morisaki, T.

AU - Morita, S.

AU - Murakami, S.

AU - Muto, S.

AU - Nagaoka, K.

AU - Nagayama, Y.

AU - Nakanishi, H.

AU - Narushima, Y.

AU - Nishimura, K.

AU - Nishiura, M.

AU - Noda, N.

AU - Ohdachi, S.

AU - Oka, Y.

AU - Osakabe, M.

AU - Ozaki, T.

AU - Peterson, B. J.

AU - Sagara, A.

AU - Sakakibara, S.

AU - Sakamoto, R.

AU - Shoji, M.

AU - Sudo, S.

AU - Takeuchi, N.

AU - Tamura, N.

AU - Tanaka, K.

AU - Toi, K.

AU - Tokuzawa, T.

AU - Tsumori, K.

AU - Watanabe, K.

AU - Watanabe, T.

AU - Yamazaki, K.

AU - Yoshinuma, M.

AU - Komori, A.

AU - Motojima, O.

PY - 2005/5/1

Y1 - 2005/5/1

N2 - One of the main objectives of LHD is to extend the plasma confinement database for helical systems and to demonstrate such extended plasma confinement properties to be sustained in the 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 LHD plasma from the initial operation. The system optimizations including the modification of the transmission and antenna system are performed with special emphasis on the local heating properties. As a result, a central electron temperature of more than 10 keV with an electron density of 0.6 × 1019 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. The 168 GHz ECRH system demonstrated efficient heating at densities more than 1.0 × 10 20 m-3. The continuous wave ECRH system is successfully operated to sustain a 756 s discharge.

AB - One of the main objectives of LHD is to extend the plasma confinement database for helical systems and to demonstrate such extended plasma confinement properties to be sustained in the 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 LHD plasma from the initial operation. The system optimizations including the modification of the transmission and antenna system are performed with special emphasis on the local heating properties. As a result, a central electron temperature of more than 10 keV with an electron density of 0.6 × 1019 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. The 168 GHz ECRH system demonstrated efficient heating at densities more than 1.0 × 10 20 m-3. The continuous wave ECRH system is successfully operated to sustain a 756 s discharge.

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M3 - Article

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JO - Plasma Physics and Controlled Fusion

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IS - 5 A

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ER -

Extension and characteristics of an ECRH plasma in LHD

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