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

Journal Article · Tue Nov 15 00:00:00 EST 2016 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.4959949· OSTI ID:22596552

Ohshima, S.; Kado, S.; Nagasaki, K.; Okada, H.; Minami, T.; Yamamoto, S.; Konoshima, S.; Mizuuchi, T. ^[1]; Matsuda, H.; Lu, X. X.; Kokubu, D.; Nakamura, Y.; Ishizawa, A.; Otani, Y. ^[2]; Ida, K.; Kobayashi, T.; Yoshinuma, M.; Oishi, T.; Kenmochi, N. ^[3]

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1. Institute of Advanced Energy, Kyoto University, Uji, Kyoto 611-0011 (Japan)
2. Graduate School of Energy Science, Kyoto University, Uji, Kyoto 611-0011 (Japan)
3. National Institute for Fusion Science, Oroshi-cho 322-6, Toki, Gifu 509-5292 (Japan)

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.

• OSTI ID: 22596552
• Journal Information: Review of Scientific Instruments, Vol. 87, Issue 11; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
75 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