Steady-state operation using a dipole mode ion cyclotron heating antenna and 77 GHz electron cyclotron heating in the Large Helical Device

T. Mutoh, T. Seki, R. Kumazawa, K. Saito, H. Kasahara, R. Seki, S. Kubo, T. Shimozuma, Y. Yoshimura, H. Igami, H. Takahashi, M. Nishiura, M. Shoji, J. Miyazawa, Y. Nakamura, M. Tokitani, N. Ashikawa, S. Masuzaki, Hiroshi Idei, G. Nomura & 9 others A. Murakami, R. Sakamoto, G. Motojima, Y. P. Zhao, J. G. Kwak, Y. Takeiri, H. Yamada, O. Kaneko, A. Komori

    Research output: Contribution to journalArticle

    18 Citations (Scopus)

    Abstract

    The steady-state operation of high-performance plasmas in the Large Helical Device (LHD) has progressed since the 2010 IAEA Conference in Korea by means of a newly installed ion cyclotron heating (ICH) antenna (HAS antenna) and an improved electron cyclotron heating (ECH) system. The HAS antenna can control the launched parallel wave number and heat the core plasma efficiently in the case of dipole mode operation. Understanding of the physics and technology of wave heating, particle and heat flow balances, and plasma-wall interactions in LHD has also improved. The heating power of steady-state ICH and ECH exceeded 1 MW and 500 kW, respectively, and a higher density helium plasma with minority hydrogen ions was maintained using the HAS antenna and new 77 GHz gyrotrons. As a result, plasma performance improved, e.g. electron temperature of more than 2 keV at a density of more than 2 × 1019 m-3 became possible for more than 1 min. Heat flow balance and particle flux balance of steady-state operation were evaluated. Particle balance analysis indicated that externally fed helium and hydrogen particles were mainly absorbed by the chamber wall and divertor plates, even after the 54 min operation.

    Original languageEnglish
    Article number063017
    JournalNuclear Fusion
    Volume53
    Issue number6
    DOIs
    Publication statusPublished - Jun 1 2013

    Fingerprint

    electron cyclotron heating
    cyclotrons
    antennas
    dipoles
    heating
    heat transmission
    ions
    cyclotron resonance devices
    helium plasma
    Korea
    minorities
    hydrogen ions
    flux (rate)
    chambers
    helium
    electron energy
    heat
    physics
    hydrogen
    interactions

    All Science Journal Classification (ASJC) codes

    • Nuclear and High Energy Physics
    • Condensed Matter Physics

    Cite this

    Steady-state operation using a dipole mode ion cyclotron heating antenna and 77 GHz electron cyclotron heating in the Large Helical Device. / Mutoh, T.; Seki, T.; Kumazawa, R.; Saito, K.; Kasahara, H.; Seki, R.; Kubo, S.; Shimozuma, T.; Yoshimura, Y.; Igami, H.; Takahashi, H.; Nishiura, M.; Shoji, M.; Miyazawa, J.; Nakamura, Y.; Tokitani, M.; Ashikawa, N.; Masuzaki, S.; Idei, Hiroshi; Nomura, G.; Murakami, A.; Sakamoto, R.; Motojima, G.; Zhao, Y. P.; Kwak, J. G.; Takeiri, Y.; Yamada, H.; Kaneko, O.; Komori, A.

    In: Nuclear Fusion, Vol. 53, No. 6, 063017, 01.06.2013.

    Research output: Contribution to journalArticle

    Mutoh, T, Seki, T, Kumazawa, R, Saito, K, Kasahara, H, Seki, R, Kubo, S, Shimozuma, T, Yoshimura, Y, Igami, H, Takahashi, H, Nishiura, M, Shoji, M, Miyazawa, J, Nakamura, Y, Tokitani, M, Ashikawa, N, Masuzaki, S, Idei, H, Nomura, G, Murakami, A, Sakamoto, R, Motojima, G, Zhao, YP, Kwak, JG, Takeiri, Y, Yamada, H, Kaneko, O & Komori, A 2013, 'Steady-state operation using a dipole mode ion cyclotron heating antenna and 77 GHz electron cyclotron heating in the Large Helical Device', Nuclear Fusion, vol. 53, no. 6, 063017. https://doi.org/10.1088/0029-5515/53/6/063017
    Mutoh, T. ; Seki, T. ; Kumazawa, R. ; Saito, K. ; Kasahara, H. ; Seki, R. ; Kubo, S. ; Shimozuma, T. ; Yoshimura, Y. ; Igami, H. ; Takahashi, H. ; Nishiura, M. ; Shoji, M. ; Miyazawa, J. ; Nakamura, Y. ; Tokitani, M. ; Ashikawa, N. ; Masuzaki, S. ; Idei, Hiroshi ; Nomura, G. ; Murakami, A. ; Sakamoto, R. ; Motojima, G. ; Zhao, Y. P. ; Kwak, J. G. ; Takeiri, Y. ; Yamada, H. ; Kaneko, O. ; Komori, A. / Steady-state operation using a dipole mode ion cyclotron heating antenna and 77 GHz electron cyclotron heating in the Large Helical Device. In: Nuclear Fusion. 2013 ; Vol. 53, No. 6.
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    AU - Mutoh, T.

    AU - Seki, T.

    AU - Kumazawa, R.

    AU - Saito, K.

    AU - Kasahara, H.

    AU - Seki, R.

    AU - Kubo, S.

    AU - Shimozuma, T.

    AU - Yoshimura, Y.

    AU - Igami, H.

    AU - Takahashi, H.

    AU - Nishiura, M.

    AU - Shoji, M.

    AU - Miyazawa, J.

    AU - Nakamura, Y.

    AU - Tokitani, M.

    AU - Ashikawa, N.

    AU - Masuzaki, S.

    AU - Idei, Hiroshi

    AU - Nomura, G.

    AU - Murakami, A.

    AU - Sakamoto, R.

    AU - Motojima, G.

    AU - Zhao, Y. P.

    AU - Kwak, J. G.

    AU - Takeiri, Y.

    AU - Yamada, H.

    AU - Kaneko, O.

    AU - Komori, A.

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    N2 - The steady-state operation of high-performance plasmas in the Large Helical Device (LHD) has progressed since the 2010 IAEA Conference in Korea by means of a newly installed ion cyclotron heating (ICH) antenna (HAS antenna) and an improved electron cyclotron heating (ECH) system. The HAS antenna can control the launched parallel wave number and heat the core plasma efficiently in the case of dipole mode operation. Understanding of the physics and technology of wave heating, particle and heat flow balances, and plasma-wall interactions in LHD has also improved. The heating power of steady-state ICH and ECH exceeded 1 MW and 500 kW, respectively, and a higher density helium plasma with minority hydrogen ions was maintained using the HAS antenna and new 77 GHz gyrotrons. As a result, plasma performance improved, e.g. electron temperature of more than 2 keV at a density of more than 2 × 1019 m-3 became possible for more than 1 min. Heat flow balance and particle flux balance of steady-state operation were evaluated. Particle balance analysis indicated that externally fed helium and hydrogen particles were mainly absorbed by the chamber wall and divertor plates, even after the 54 min operation.

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