Publication Type
Journal
Journal Name
Physics of Plasmas
Publication Date
Page Numbers
1063 to 1069
Volume
19
Issue
4
Abstract
A deuterium H-mode discharge with a plasma current of 300 kA, an axial toroidal magnetic field of
0.55 T, and a calculated non-inductive plasma current fraction of 0.7–1 has been generated in the
National Spherical Torus Experiment by 1.4MW of 30MHz high-harmonic fast wave (HHFW)
heating and current drive. Seventy-five percent of the non-inductive current was generated inside
an internal transport barrier that formed at a normalized minor radius 0.4. Three quarters of the
non-inductive current was bootstrap current, and the remaining non-inductive current was
generated directly by HHFW power inside a normalized minor radius 0.2. VC 2012 American
Institute of Physics.