Note: Multi-pass Thomson scattering measurement on the TST-2 spherical tokamak

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:10.1063/1.4878260

Note: Multi-pass Thomson scattering measurement on the TST-2 spherical tokamak

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

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

6 Citations (Scopus)

Abstract

In multi-pass Thomson scattering (TS) scheme, a laser pulse makes multiple round trips through the plasma, and the effective laser energy is enhanced, and we can increase the signal-to-noise ratio as a result. We have developed a coaxial optical cavity in which a laser pulse is confined, and we performed TS measurements using the coaxial cavity in tokamak plasmas for the first time. In the optical cavity, the laser energy attenuation was approximately 30% in each round trip, and we achieved a photon number gain of about 3 compared with that obtained in the first round trip. In addition, the temperature measurement accuracy was improved by accumulating the first three round trip waveforms.

Original language	English
Article number	056103
Journal	Review of Scientific Instruments
Volume	85
Issue number	5
DOIs	https://doi.org/10.1063/1.4878260
Publication status	Published - May 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). Note: Multi-pass Thomson scattering measurement on the TST-2 spherical tokamak. Review of Scientific Instruments, 85(5), [056103]. https://doi.org/10.1063/1.4878260

Note : Multi-pass Thomson scattering measurement on the TST-2 spherical tokamak. / 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.

In: Review of Scientific Instruments, Vol. 85, No. 5, 056103, 05.2014.

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, 'Note: Multi-pass Thomson scattering measurement on the TST-2 spherical tokamak', Review of Scientific Instruments, vol. 85, no. 5, 056103. https://doi.org/10.1063/1.4878260

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. / Note : Multi-pass Thomson scattering measurement on the TST-2 spherical tokamak. In: Review of Scientific Instruments. 2014 ; Vol. 85, No. 5.

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abstract = "In multi-pass Thomson scattering (TS) scheme, a laser pulse makes multiple round trips through the plasma, and the effective laser energy is enhanced, and we can increase the signal-to-noise ratio as a result. We have developed a coaxial optical cavity in which a laser pulse is confined, and we performed TS measurements using the coaxial cavity in tokamak plasmas for the first time. In the optical cavity, the laser energy attenuation was approximately 30% in each round trip, and we achieved a photon number gain of about 3 compared with that obtained in the first round trip. In addition, the temperature measurement accuracy was improved by accumulating the first three round trip waveforms.",

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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.

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AB - In multi-pass Thomson scattering (TS) scheme, a laser pulse makes multiple round trips through the plasma, and the effective laser energy is enhanced, and we can increase the signal-to-noise ratio as a result. We have developed a coaxial optical cavity in which a laser pulse is confined, and we performed TS measurements using the coaxial cavity in tokamak plasmas for the first time. In the optical cavity, the laser energy attenuation was approximately 30% in each round trip, and we achieved a photon number gain of about 3 compared with that obtained in the first round trip. In addition, the temperature measurement accuracy was improved by accumulating the first three round trip waveforms.

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Note: Multi-pass Thomson scattering measurement on the TST-2 spherical tokamak

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