Plasma equilibrium based on EC-driven current profile with toroidal rotation on QUEST

Highlights: • Plasma current seems to flow in the open magnetic surface in the outside of the closed magnetic surface in the low-field region. • Considering the toroidal rotation, the equilibrium is fitted within nested magnetic surfaces by SU-EFIT. • Sum of contributions from toroidal rotation and pressure gradient to plasma current density is constant. -- Abstract: In the EC-driven (8.2 GHz) steady-state plasma on QUEST, plasma current seems to flow in the open magnetic surface in the outside of the closed magnetic surface in the low-field region according to plasma current fitting method without taking equilibrium into account. In our previous work, plasma equilibrium solution was fitted assuming all plasma current is flowing in the inside of the Last Closed Flux Surface (LCFS). It was solved within isotropic pressure profile by EFIT code. Opposite-polarity current density region appeared in the high-field region. Here in this article, considering the toroidal rotation, the equilibrium is fitted within nested magnetic surfaces by SU-EFIT. Though the plasma magnetic axis shifts outward due to the centrifugal force, the opposite polarity current does not disappear in the high-field region. And relation between the toroidal rotation speed and the poloidal beta value will be discussed.