Figure-Observation of coherent mode induced by a molybdenum dust on EAST

Fig.1 shows a picture of the vacuum vessel covered with different materials and layout of diagnostics used in this work.Fig.2 shows four images taken at different time slices by a tangentially viewing visible CCD camera in EAST, which captured the birth of a dust from the upper divertor region.Fig.3 shows the time evolutions of different emission lines measured by the EUV spectrometers in EAST, which indicates the dust is Mo.Fig.4 shows the evidence of the apperance of coherent mode, which are only observed by different diagnostics monitoring the pedestal region.