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Title: 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 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.
Authors:
; ; ; ; ; ; ; ; ; ; ; ;  [1] ; ; ; ;  [2] ; ; ;  [3] more »; « less
  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)
Publication Date:
OSTI Identifier:
22308929
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 85; Journal Issue: 11; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
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