Poloidal phasing effects on particle transport during ion Bernstein heating

Ion Bernstein wave (IBW) heating experiments are performed with a poloidall y phased antenna. Between two kinds of poloidal phasing, no difference is f ound with the heating effect which is expected from the mechanism of heatin g presented previously. The significant differences due to the difference o f poloidal phasing are found in observations of electron density variation, emission intensities of impurity lines and scrape-off layer plasma. All th e results show that the poloidal phasing brings about variations of particl e transport, and a ponderomotive effect of the antenna near-field might be the most probable mechanism. The phasing effect should be considered on an intense radio frequency (RF) injection by poloidally aligned antenna elemen ts.