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

• DOI: 10.1088/1741-4326/aa7c20
• Publication Date: 2017-06-28T09:15:16Z
• Authors: 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. Yoshikawa; M. Sakamoto; S. Kawasaki; H. Nakashima; A. Higashijima; S. Ide; T. Maekawa; Y. Takase; K. Toi
• Keywords: Harmonic; Spherical tokamak; Electron cyclotron resonance

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 of 54 kA non-inductively ramped up and sustained stably for 0.9 s 270 kW wave. higher 66 also achieved slow vertical field. We have significantly than those previously 2nd EC waves. This fully method might be useful future burning devices fusion reactors, particular operations at half magnetic field same heating equipment.