Improvements of data quality of the LHD Thomson scattering diagnostics in high-temperature plasma experiments | Zendy

I. Yamada | Zendy; K. Narihara | Zendy; H. Funaba | Zendy; Hiroshi Hayashi | Zendy; T. Kohmoto | Zendy; H. Takahashi | Zendy; Τ. Shimozuma | Zendy; S. Kubo | Zendy; Y. Yoshimura | Zendy; H. Igami | Zendy; N. Tamura | Zendy

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Improvements of data quality of the LHD Thomson scattering diagnostics in high-temperature plasma experiments

Author(s) -

I. Yamada,

K. Narihara,

H. Funaba,

Hiroshi Hayashi,

T. Kohmoto,

H. Takahashi,

Τ. Shimozuma,

S. Kubo,

Y. Yoshimura,

H. Igami,

N. Tamura

Publication year - 2010

Publication title -

review of scientific instruments

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.605

H-Index - 165

eISSN - 1089-7623

pISSN - 0034-6748

DOI - 10.1063/1.3483189

Subject(s) - thomson scattering , large helical device , laser , electron temperature , plasma , materials science , scattering , plasma diagnostics , electron , atomic physics , optics , physics , nuclear physics

In Large Helical Device (LHD) experiments, an electron temperature (Te) more than 15 keV has been observed by the yttrium-aluminum-garnet (YAG) laser Thomson scattering diagnostic. Since the LHD Thomson scattering system has been optimized for the temperature region, 50?eV ? Te ? 10?keV, the data quality becomes worse in the higher Te region exceeding 10 keV. In order to accurately determine Te in the LHD high-Te experiments, we tried to increase the laser pulse energy by simultaneously firing three lasers. The technique enables us to decrease the uncertainties in the measured Te. Another signal accumulation method was also tested. In addition, we estimated the influence of high-energy electrons on Te obtained by the LHD Thomson scattering system

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