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Published on: June 9, 2016
Development of beam emission spectroscopy for turbulence transport study in Heliotron J
S Kobayashi1, S Ohshima1, H Matsuda2
1Institute of Advanced Energy, Kyoto University, Uji, Kyoto 611-0011, Japan.
Abstract:
This paper describes the development study of the beam emission spectroscopy (BES) for the turbulent transport study in Heliotron J. Modification of the sightlines (10 × 4 for edge and 10 × 2 for edge) enables us to obtain 2-dimensional BES imaging. The cooling effect on the reduction in the electrical noise of avalanche photodiode (APD) assembly has been investigated using a refrigerant cooling system. When the temperature of the APD element has set to be -20 °C, the electrical noise can be reduced more than 50%. The measurement error of the phase difference in the case of low signal level has been tested by two light-emitting diode lamps. The APD cooling has an effect to improve the measurement error at the low signal level of APD.
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