DEPENDENCE OF PLASMA PROFILES ON ECH POWER ABSORPTION IN HELIOTRON-E

Dependence of plasma profiles on the power absorption of electron cycl otron heating is experimentally studied in the Heliotron-E helical dev ice. A focused Gaussian beam with controllable polarization makes it p ossible to change the power absorption. The electron density and tempe rature profiles are sensitive to the single pass absorption rate. The electron temperature profile is peaked and the density profile is holl ow as the single pass absorption increases. The resonance position is also important for determining their profiles. The electron temperatur e profile is changed from a peaked one to a hollow one: depending on t he resonance position. The nondiffusive outward flow, which is necessa ry to form a hollow temperature profile, is estimated by using a simpl e heat transport model.