Beam emission spectroscopy with radially and poloidally elongated optical sightlines | Zendy

Makoto Ono | Zendy; K. Ida | Zendy; T. Kobayashi | Zendy; M. Yoshinuma | Zendy; Yukio Nakamura | Zendy; M. Kisaki | Zendy; H. Nakano | Zendy; C. Moon | Zendy

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Beam emission spectroscopy with radially and poloidally elongated optical sightlines

Author(s) -

Makoto Ono,

K. Ida,

T. Kobayashi,

M. Yoshinuma,

Yukio Nakamura,

M. Kisaki,

H. Nakano,

C. Moon

Publication year - 2016

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 - 10.1063/1.4963311

Subject(s) - spectroscopy , optics , beam (structure) , emission spectrum , plasma , sensitivity (control systems) , physics , materials science , spectral line , astronomy , quantum mechanics , electronic engineering , engineering

Beam emission spectroscopy is widely used as local density fluctuation measurement of fusion plasmas. We have installed a beam emission spectroscopy system in the large helical device (LHD) with radially and poloidally elongated optical configuration to enhance both signal-to-noise ratio and wavenumber sensitivity in radial and poloidal directions. The calculation considering the integral effect of the line of sight showed the radially and poloidally elongated sightlines have increased sensitivity compared with the square shaped bundle design of the same sampling area.

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