Demonstration of improvement in the signal-to-noise ratio of Thomson scattering signal obtained by using a multi-pass optical cavity on the Tokyo Spherical Tokamak-2

Journal Article · Sat Nov 15 00:00:00 EST 2014 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.4891707· OSTI ID:22308929

Ejiri, A.; Nakamura, K.; Takase, Y.; Yamaguchi, T.; Furui, H.; Imamura, K.; Inada, T.; Nakanishi, A.; Oosako, T.; Shinya, T.; Tsuda, S.; Tsujii, N. ^[1]; Hiratsuka, J.; Kakuda, H.; Sonehara, M.; Wakatsuki, T. ^[2]; Hasegawa, M.; Nagashima, Y.; Narihara, K. ^[3]; others, and

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1. Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa 277-8561 (Japan)
2. Graduate School of Science, The University of Tokyo, Tokyo 113-0033 (Japan)
3. Research Institute of Applied Mechanics, Kyushu University, Kasuga 816-8580 (Japan)

The multi-pass Thomson scattering (TS) scheme enables obtaining many photons by accumulating multiple TS signals. The signal-to-noise ratio (SNR) depends on the accumulation number. In this study, we performed multi-pass TS measurements for ohmically heated plasmas, and the relationship between SNR and the accumulation number was investigated. As a result, improvement of SNR in this experiment indicated similar tendency to that calculated for the background noise dominant situation.

• OSTI ID: 22308929
• Journal Information: Review of Scientific Instruments, Vol. 85, Issue 11; Other Information: (c) 2014 AIP Publishing LLC; 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
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
BACKGROUND NOISE
BUILDUP
CDTE SEMICONDUCTOR DETECTORS
HOT PLASMA
PHOTONS
SIGNAL-TO-NOISE RATIO
SPHERICAL CONFIGURATION
THOMSON SCATTERING
TOKAMAK DEVICES