Electron density profile measurements from hydrogen line intensity ratio method in Versatile Experiment Spherical Torus

Electron density profiles of versatile experiment spherical torus plasmas are measured by using a hydrogen line intensity ratio method. A fast-frame visible camera with appropriate bandpass filters is used to detect images of Balmer line intensities. The unique optical system makes it possible to ta...

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Bibliographic Details
Published in:Review of scientific instruments 2016-11, Vol.87 (11), p.11E540-11E540
Main Authors: Kim, YooSung, Shi, Yue-Jiang, Yang, Jeong-hun, Kim, SeongCheol, Kim, Young-Gi, Dang, Jeong-Jeung, Yang, Seongmoo, Jo, Jungmin, Oh, Soo-Ghee, Chung, Kyoung-Jae, Hwang, Y. S.
Format: Article
Language:English
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Summary:Electron density profiles of versatile experiment spherical torus plasmas are measured by using a hydrogen line intensity ratio method. A fast-frame visible camera with appropriate bandpass filters is used to detect images of Balmer line intensities. The unique optical system makes it possible to take images of Hα and Hβ radiation simultaneously, with only one camera. The frame rate is 1000 fps and the spatial resolution of the system is about 0.5 cm. One-dimensional local emissivity profiles have been obtained from the toroidal line of sight with viewing dumps. An initial result for the electron density profile is presented and is in reasonable agreement with values measured by a triple Langmuir probe.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.4960535