The role of fast electrons on the non-inductive current ramp-up in QUEST

S. Tashima, H. Zushi, M. Isobe, S. Okamura, H. Idei, K. Hanada, S. K. Sharma, T. Ryoukai, M. Ishiguro, H. Liu

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Abstract

    The role of energetic electrons during the non-inductive current ramp-up is investigated in electron cyclotron heated plasma (≤ 60kW) in the spherical tokamak QUEST. The pulse height analysis of the hard X-ray (HX) is carried out with a fast time resolution of ≥1 ms, and acceleration of the electrons are studied by measuring the evolution of spectrum. It is found that wall recycling condition affects the formation of the tokamak configuration from an initial open magnetic field configuration. The vertical magnetic field Bz dependence of driven current Ip (~ 11 kA) is compared with those of HXs for studying contribution of fast electron. For high recycling case, Ip and HXs show peaks at an optimal low value of Bz/Bt = 7 ×10-3, however, for low recycling case, both increase monotonically with B z/Bt = 7 ×10-3 - 21×10 -3.

    Original languageEnglish
    Title of host publication37th EPS Conference on Plasma Physics 2010, EPS 2010
    Pages1716-1719
    Number of pages4
    Publication statusPublished - 2010
    Event37th EPS Conference on Plasma Physics 2010, EPS 2010 - Dublin, Ireland
    Duration: Jun 21 2010Jun 25 2010

    Publication series

    Name37th EPS Conference on Plasma Physics 2010, EPS 2010
    Volume3

    Other

    Other37th EPS Conference on Plasma Physics 2010, EPS 2010
    CountryIreland
    CityDublin
    Period6/21/106/25/10

    All Science Journal Classification (ASJC) codes

    • Atomic and Molecular Physics, and Optics

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  • Cite this

    Tashima, S., Zushi, H., Isobe, M., Okamura, S., Idei, H., Hanada, K., Sharma, S. K., Ryoukai, T., Ishiguro, M., & Liu, H. (2010). The role of fast electrons on the non-inductive current ramp-up in QUEST. In 37th EPS Conference on Plasma Physics 2010, EPS 2010 (pp. 1716-1719). (37th EPS Conference on Plasma Physics 2010, EPS 2010; Vol. 3).