Experimental Results of IBW Heating on the HT-7 Tokmak

Ion Bernstein waves （IBWs） have been proposed to be useful for heating and im-proving transport in tokamak plasmas. An Ion Bernstein wave heating experiment using differentfrequency （27 MHz and 30 MHz） was carried out on HT-7 superconducting tokamak in recent ex-periments. At a frequency of 30 MHz, ne peaked and Hα dropped have been pervasively observed,τP was improved by a factor of 2 ~ 4, and τe increased by a factor of 1 ~ 1.5. An obvious con-finement of particle was observed during the IBW pulse. At 27 MHz, both global and localizedelectron heating were observed depending on the location of the ion resonant layer by changing Bt.Central electron heating effect was obtained in the global heating mode and electron temperaturestrongly increased near the 2 ΩD resonant layer for localized heating mode.