Observation of a new type of self-generated current in magnetized plasmas

• DOI: 10.1038/s41467-022-34092-0
• Publication Date: 2022-10-29T16:05:04Z
• Authors: Yong-Su Na; Jaemin Seo; Yoonji Lee; Gyungjin Choi; Minseo Park; Sangjin Park; Sumin Yi; Weixing Wang; Min-Gu Yoo; Minsoo Cha; Beomsu Kim; Young-Ho Lee; Hyunsun Han; Boseong Kim; Chanyoung Lee; SangKyeun Kim; SeongMoo Yang; Cheol-Sik Byun; Hyun-Seok Kim; Jinseok Ko; Woochang Lee; Taik Soo Hahm
• Keywords: KSTAR; Bootstrap current; Electric current; Fusion power

Abstract A tokamak, a torus-shaped nuclear fusion device, needs an electric current in the plasma to produce magnetic field poloidal direction for confining plasmas. Plasma is conventionally generated by electromagnetic induction. However, steady-state reactor, minimizing inductive essential extend tokamak operating duration. Several non-inductive drive schemes have been developed operations such as radio-frequency waves and neutral beams. commercial reactors require minimal use of these external sources maximize gain, Q, ratio power power. Apart from drives, self-generated current, so-called bootstrap was predicted theoretically demonstrated experimentally. Here, we reveal another that can exist this has not yet discussed present theories. We report conclusive experimental evidence observed KSTAR tokamak.