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A mode conversion theory of the fast magnetosonic wave is compared with the experimental results in a deuterium plasma with minority hydrogen. The direct measurements of toroidal wave length, toroidal damping length, and the increase of ion temperature show that parameter dependences of ion heating are well explained by the mode conversion theory including tunneling, reflection, and absorption of the fast wave at a two-ion hybrid resonance layer.

It is observed that fast waves launched into an electron cyclotron heated plasma from a phased four-strip-line antenna array couple effectively with core electrons. This coupling produces enhanced electron cyclotron emission and a drop in the loop voltage. These effects depend on the phase difference between adjacent strip lines and on the electron density. An absorption efficiency of 20% is deduced under the conditions {ital v}{sub {ital ph}}/v{sub e0}{similar to}3 and {ital f}{sub 0}/f{sub LH}(0){similar to}0.38. The experimental results agree well with predictions based on electron Landau damping of fast waves.