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

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...

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Veröffentlicht in:	Review of scientific instruments 2014-11, Vol.85 (11), p.11D846-11D846
Hauptverfasser:	Togashi, H, Ejiri, A, Hiratsuka, J, Nakamura, K, Takase, Y, Yamaguchi, T, Furui, H, Imamura, K, Inada, T, Kakuda, H, Nakanishi, A, Oosako, T, Shinya, T, Sonehara, M, Tsuda, S, Tsujii, N, Wakatsuki, T, Hasegawa, M, Nagashima, Y, Narihara, K, Yamada, I, Tojo, H
Format:	Artikel
Sprache:	eng
Schlagworte:	70 PLASMA PHYSICS AND FUSION TECHNOLOGY BACKGROUND NOISE BUILDUP CDTE SEMICONDUCTOR DETECTORS HOT PLASMA INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY PHOTONS SIGNAL-TO-NOISE RATIO SPHERICAL CONFIGURATION THOMSON SCATTERING TOKAMAK DEVICES
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Zusammenfassung:	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.
ISSN:	0034-6748 1089-7623
DOI:	10.1063/1.4891707