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; Makoto Hasegawa; Yoshihiko 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, Makoto Hasegawa, Yoshihiko Nagashima, K. NariharaI. Yamada, H. Tojo

Division of Nuclear Fusion Dynamics

Research output: Contribution to journal › Article › peer-review

1 Citation (Scopus)

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	11D486
Journal	Review of Scientific Instruments
Volume	85
Issue number	11
DOIs	https://doi.org/10.1063/1.4891707
Publication status	Published - Jan 1 2014

All Science Journal Classification (ASJC) codes

Instrumentation

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10.1063/1.4891707

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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), [11D486]. https://doi.org/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. / 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, Makoto ; Nagashima, Yoshihiko; Narihara, K.; Yamada, I.; Tojo, H.

In: Review of Scientific Instruments, Vol. 85, No. 11, 11D486, 01.01.2014.

Research output: Contribution to journal › Article › peer-review

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, 11D486. 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, Makoto ; Nagashima, Yoshihiko ; Narihara, K. ; Yamada, I. ; Tojo, H. / 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. In: Review of Scientific Instruments. 2014 ; Vol. 85, No. 11.

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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.",

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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, Makoto

AU - Nagashima, Yoshihiko

AU - Narihara, K.

AU - Yamada, I.

AU - Tojo, H.

PY - 2014/1/1

Y1 - 2014/1/1

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