TY - JOUR
T1 - Note
T2 - Multi-pass Thomson scattering measurement on the TST-2 spherical tokamak
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 - 2014/5
Y1 - 2014/5
N2 - 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.
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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U2 - 10.1063/1.4878260
DO - 10.1063/1.4878260
M3 - Article
AN - SCOPUS:84901327963
VL - 85
JO - Review of Scientific Instruments
JF - Review of Scientific Instruments
SN - 0034-6748
IS - 5
M1 - 056103
ER -