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Author Kobayashi, S. ♦ Ohshima, S. ♦ Kado, S. ♦ Nagasaki, K. ♦ Okada, H. ♦ Minami, T. ♦ Yamamoto, S. ♦ Konoshima, S. ♦ Mizuuchi, T. ♦ Matsuda, H. ♦ Lu, X. X. ♦ Kokubu, D. ♦ Nakamura, Y. ♦ Ishizawa, A. ♦ Otani, Y. ♦ Ida, K. ♦ Kobayashi, T. ♦ Yoshinuma, M. ♦ Oishi, T. ♦ Kenmochi, N.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY ♦ CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY ♦ BEAMS ♦ COOLING ♦ COOLING SYSTEMS ♦ EMISSION ♦ EMISSION SPECTROSCOPY ♦ ERRORS ♦ HELIOTRON ♦ IMAGES ♦ LIGHT EMITTING DIODES ♦ NOISE ♦ REDUCTION ♦ REFRIGERANTS ♦ SIGNALS ♦ TURBULENCE ♦ TWO-DIMENSIONAL CALCULATIONS
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.
ISSN 00346748
Educational Use Research
Learning Resource Type Article
Publisher Date 2016-11-15
Publisher Place United States
Journal Review of Scientific Instruments
Volume Number 87
Issue Number 11


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