Plasma current start-up by outboard PF coils in JT-60U and TST-2

Y. Takase, A. Ejiri, K. Hanada, S. Ide, O. Mitarai, S. Shiraiwa, M. Ushigome

    研究成果: Chapter in Book/Report/Conference proceedingConference contribution

    抄録

    Plasma current (Ip) initiation and ramp-up utilizing induction by poloidal field (PF) coils located on the outboard side of the torus were demonstrated in both conventional aspect ratio tokamak (100 kA in JT-60U) and spherical tokamak (10 kA in TST-2). In the presence of sufficient source of plasma by RF ionization (1 MW in JT-60U, 100 kW in TST-2), Ip formation is possible without the existence of a PF null, with the initial vertical field (Bv) in the direction opposite to that required for equilibrium. Utilization of the extra flux swing provided by the PF coils before Bv switches sign is important in arriving at a high enough I p that matches Bv at the end of PF coil current ramp. In JT-60U, recharging of the OH coil was observed with only perpendicular and counter NB injection, suggesting overdrive by bootstrap current. In TST-2, a quasi-steady-state Ip of 4 kA was formed and sustained by RF power (PRF) alone, without the use of induction. The plasma current centroid of this type of plasma is located on the outboard side. The dependences of Ip on PRF and Bv were found to be weak. The results presented here offer encouragement to CS-less operation of a tokamak fusion reactor, which should have a large impact on the economic competitiveness.

    本文言語英語
    ホスト出版物のタイトルRADIO FREQUENCY POWER IN PLASMAS
    ホスト出版物のサブタイトル16th Topical Conference on Radio Frequency Power in Plasmas
    ページ365-368
    ページ数4
    DOI
    出版ステータス出版済み - 9 26 2005
    イベントRADIO FREQUENCY POWER IN PLASMAS: 16th Topical Conference on Radio Frequency Power in Plasmas - Park City, UT, 米国
    継続期間: 4 11 20054 13 2005

    出版物シリーズ

    名前AIP Conference Proceedings
    787
    ISSN(印刷版)0094-243X
    ISSN(電子版)1551-7616

    その他

    その他RADIO FREQUENCY POWER IN PLASMAS: 16th Topical Conference on Radio Frequency Power in Plasmas
    国/地域米国
    CityPark City, UT
    Period4/11/054/13/05

    All Science Journal Classification (ASJC) codes

    • 物理学および天文学(全般)

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