Development of a Thomson Scattering System in the TST-2 Spherical Tokamak

Takashi Yamaguchi, A. Ejiri, J. Hiratsuka, Y. Takase, Y. Nagashima, Osamu Watanabe, Takuya Sakamoto, Takuya OHSAKO, Byung Il AN, Hiroki Kurashina,

Plasma and Fusion Research · 2010 · 16 citations · 5 references

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Abstract

The Thomson scattering system in the TST-2 has been upgraded to improve the reliability and accuracy of measurements. The signal intensity increased because of a new high-energy (1.6 J) laser. A large-numerical-aperture (N.A.) fiber was tested, and it was found that a 6-m-long fiber can be used without significant transmission loss. With the upgraded system, the typical central electron temperature and the electron density for ohmic discharges (with a plasma current of 60 kA) are 150 eV and 1.5 × 1019 m−3, respectively. The temperature profile has a maximum near the center of the plasma.

References

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