Fully non-inductive second harmonic electron cyclotron plasma ramp-up in the QUEST spherical tokamak

H. Idei, T. Kariya, T. Imai, K. Mishra, T. Onchi, O. Watanabe, H. Zushi, K. Hanada, J. Qian, A. Ejiri, M. M. Alam, K. Nakamura, A. Fujisawa, Y. Nagashima, M. Hasegawa, K. Matsuoka, A. Fukuyama, S. Kubo, T. Shimozuma, M. YoshikawaM. Sakamoto, S. Kawasaki, H. Nakashima, A. Higashijima, S. Ide, T. Maekawa, Y. Takase, K. Toi

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Abstract

Fully non-inductive second (2nd) harmonic electron cyclotron (EC) plasma current ramp-up was demonstrated with a newlly developed 28 GHz system in the QUEST spherical tokamak. A high plasma current of 54 kA was non-inductively ramped up and sustained stably for 0.9 s with a 270 kW 28 GHz wave. A higher plasma current of 66 kA was also non-inductively achieved with a slow ramp-up of the vertical field. We have achieved a significantly higher plasma current than those achieved previously with the 2nd harmonic EC waves. This fully non-inductive 2nd harmonic EC plasma ramp-up method might be useful for future burning plasma devices and fusion reactors, in particular for operations at half magnetic field with the same EC heating equipment.

Original languageEnglish
Article number126045
JournalNuclear Fusion
Volume57
Issue number12
DOIs
Publication statusPublished - Oct 5 2017

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Condensed Matter Physics

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    Idei, H., Kariya, T., Imai, T., Mishra, K., Onchi, T., Watanabe, O., Zushi, H., Hanada, K., Qian, J., Ejiri, A., Alam, M. M., Nakamura, K., Fujisawa, A., Nagashima, Y., Hasegawa, M., Matsuoka, K., Fukuyama, A., Kubo, S., Shimozuma, T., ... Toi, K. (2017). Fully non-inductive second harmonic electron cyclotron plasma ramp-up in the QUEST spherical tokamak. Nuclear Fusion, 57(12), [126045]. https://doi.org/10.1088/1741-4326/aa7c20