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

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 with...

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Bibliographic Details
Published in:Plasma and Fusion Research 2010/12/10, Vol.5, pp.S2092-S2092
Main Authors: YAMAGUCHI, Takashi, EJIRI, Akira, HIRATSUKA, Junichi, TAKASE, Yuichi, NAGASHIMA, Yoshihiko, WATANABE, Osamu, SAKAMOTO, Takuya, OHSAKO, Takuya, AN, Byung Il, KURASHINA, Hiroki, KOBAYASHI, Hiroaki, HAYASHI, Hiroyuki, MATSUZAWA, Hazuki, YAMADA, Kotaro, KAKUDA, Hidetoshi, HANASHIMA, Kentaro, WAKATSUKI, Takuma
Format: Article
Language:English
Subjects:
fiber
multi point measurement
Newtonian mirror system
polychromator
Rayleigh scattering
spherical tokamak
Thomson scattering
TST-2
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Summary: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.
ISSN:1880-6821
1880-6821
DOI:10.1585/pfr.5.S2092