Extension and characteristics of an ECRH plasma in LHD

S. Kubo, T. Shimozuma, Y. Yoshimura, T. Notake, H. Idei, S. Inagaki, 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

Research output: Contribution to journalArticle

29 Citations (Scopus)

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 languageEnglish
Article number008
Pages (from-to)A81-A90
JournalPlasma Physics and Controlled Fusion
Volume47
Issue number5 A
DOIs
Publication statusPublished - May 1 2005

Fingerprint

Plasma heating
Electron cyclotron resonance
plasma heating
Plasma confinement
electron cyclotron resonance
Heating
heating
plasma control
Electron temperature
electron energy
Plasmas
stellarators
temperature profiles
continuous radiation
Carrier concentration
antennas
Antennas
gradients
optimization

All Science Journal Classification (ASJC) codes

  • Nuclear Energy and Engineering
  • Condensed Matter Physics

Cite this

Kubo, S., Shimozuma, T., Yoshimura, Y., Notake, T., Idei, H., Inagaki, S., ... 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

Extension and characteristics of an ECRH plasma in LHD. / Kubo, S.; 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.; Peterson, B. J.; 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.

In: Plasma Physics and Controlled Fusion, Vol. 47, No. 5 A, 008, 01.05.2005, p. A81-A90.

Research output: Contribution to journalArticle

Kubo, S, 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, 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
Kubo, S. ; 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. ; Peterson, B. J. ; 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. / Extension and characteristics of an ECRH plasma in LHD. In: Plasma Physics and Controlled Fusion. 2005 ; Vol. 47, No. 5 A. pp. A81-A90.
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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.",
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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 - Inagaki, S.

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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