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

H. Togashi; A. Ejiri; J. Hiratsuka; K. Nakamura; Y. Takase; T. Yamaguchi; H. Furui; K. Imamura; T. Inada; H. Kakuda; A. Nakanishi; T. Oosako; T. Shinya; M. Sonehara; S. Tsuda; N. Tsujii; T. Wakatsuki; M. Hasegawa; Y. Nagashima; K. Narihara; I. Yamada; H. Tojo

doi:10.1063/1.4891707

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

H. Togashi, A. Ejiri, J. Hiratsuka, K. Nakamura, Y. Takase, T. Yamaguchi, H. Furui, K. Imamura, T. Inada, H. Kakuda, A. Nakanishi, T. Oosako, T. Shinya, M. Sonehara, S. Tsuda, N. Tsujii, T. Wakatsuki, M. Hasegawa, Y. Nagashima, K. NariharaI. Yamada, H. Tojo

Division of Nuclear Fusion Dynamics

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Abstract

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.

Original language	English
Article number	11D846
Journal	Review of Scientific Instruments
Volume	85
Issue number	11
DOIs	https://doi.org/10.1063/1.4891707
Publication status	Published - Nov 2014

All Science Journal Classification (ASJC) codes

Instrumentation

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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., ... Tojo, H. (2014). 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. Review of Scientific Instruments, 85(11), [11D846]. https://doi.org/10.1063/1.4891707

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 2014, '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', Review of Scientific Instruments, vol. 85, no. 11, 11D846. https://doi.org/10.1063/1.4891707

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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",

abstract = "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.",

author = "H. Togashi and A. Ejiri and J. Hiratsuka and K. Nakamura and Y. Takase and T. Yamaguchi and H. Furui and K. Imamura and T. Inada and H. Kakuda and A. Nakanishi and T. Oosako and T. Shinya and M. Sonehara and S. Tsuda and N. Tsujii and T. Wakatsuki and M. Hasegawa and Y. Nagashima and K. Narihara and I. Yamada and H. Tojo",

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doi = "10.1063/1.4891707",

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T1 - 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

AU - Togashi, H.

AU - Ejiri, A.

AU - Hiratsuka, J.

AU - Nakamura, K.

AU - Takase, Y.

AU - Yamaguchi, T.

AU - Furui, H.

AU - Imamura, K.

AU - Inada, T.

AU - Kakuda, H.

AU - Nakanishi, A.

AU - Oosako, T.

AU - Shinya, T.

AU - Sonehara, M.

AU - Tsuda, S.

AU - Tsujii, N.

AU - Wakatsuki, T.

AU - Hasegawa, M.

AU - Nagashima, Y.

AU - Narihara, K.

AU - Yamada, I.

AU - Tojo, H.

PY - 2014/11

Y1 - 2014/11

N2 - 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.

AB - 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.

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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

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