N. Ashikawa, Y. Tomita, S. Masuzaki, A. Sagara, G. Kawamura, K. Nishimura, N. Ohno and LHD experimental group


Characterization of heated dust particles using infrared and dynamic images in LHD

Date of publication:

Oct. 2008

Key words:

21 IAEA Fusion Energy Conference, EX/P4-7


To investigate the dust properties, their movements were observed by a high-speed (time resolution of 5.3 ms) infrared camera in the Large Helical Device (LHD). Heated dust velocities were estimated to be 1-15 m/s in this experiment. We propose a method for revealing the three-dimensional position of heated dust particles using real and reflected images on the wall observed by an infrared camera. A simple theoretical model shows that the sizes of dust particles have been estimated using experimental observations, such as change of dust velocity and the background plasma parameters.

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