Detection of edge ion cyclotron emission driven by energetic deuterium ions in the EAST

Ion cyclotron emission (ICE) detection system has been successfully designed and used on the Experimental Advanced Superconducting Tokamak (EAST). Experiments were performed in deuterium target plasmas, with the neutral heating beam consisting of 100% deuterium atoms accelerated up to 55-70 keV. The spectrum analyzer was used to detect the spectrogram of ICE signals with the operation frequencies of 10 MHz and 100 MHz. The spectrogram of ICE signals contains very strong and narrow emission lines, which correspond to successive cyclotron harmonics of deuterons at the outer midplane (major radius R∼2.20 m). In addition, experimental observations of correlations with edge-localized modes also support that the excitation region of the ICE is located near the plasma edge.