Development of beam emission spectroscopy for turbulence transport study in Heliotron J

作者：Kobayashi S^*; Ohshima S; Matsuda H; Lu X X; Kokubu D; Ida K; Kobayashi T; Yoshinuma M; Kado S; Oishi T; Nagasaki K; Okada H; Minami T; Yamamoto S; Nakamura Y; Ishizawa A; Kenmochi N; Otani Y; Konoshima S; Mizuuchi T

来源：Review of Scientific Instruments, 2016, 87(11): 11E519.

DOI：10.1063/1.4959949

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 x 4 for edge and 10 x 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 degrees 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. Published by AIP Publishing.

• 出版日期2016-11