Ion Bernstein wave (IBW) heating has been investigated in the HT-7 supercon
ducting tokamak. Electron heating mode was concentrated on deuterium plasma
with an injecting power to 320 kW. The bulk electron temperature showed a
significant rise with a heating factor, DeltaT(e) x n(e)/P-RF, up to 9.4 eV
x 10(13) cm(-3) kW(-1). The direct electron heating via electron Landau da
mping from IBW has been demonstrated after intensive RF wall conditioning.
Both on-axis and off-axis electron heating were obtained. Electron temperat
ure profile was modified by IBW under different plasma conditions. Edge den
sity showed no sharp drop during IBW heating. Plasma density and temperatur
e remained almost unchanged in front of antenna. But edge temperature and d
ensity inside of plasma visibly increased and their profiles became steeper
. Particle confinement improvement was observed by IBW.