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

YooSung Kim; Yue-Jiang Shi; Jeong-Hun Yang; SeongCheol Kim; Young-Gi Kim; Jeong-Jeung Dang; Seongmoo Yang; Jungmin Jo; Soo-Ghee Oh; Kyoung-Jae Chung; Y S Hwang

doi:10.1063/1.4960535

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

Rev Sci Instrum. 2016 Nov;87(11):11E540. doi: 10.1063/1.4960535.

Authors

Affiliations

¹ Department of Nuclear Engineering, Seoul National University, Seoul 151-744, South Korea.
² Division of Energy Systems Research, Ajou University, Suwon 442-749, South Korea.

PMID: 27910347
DOI: 10.1063/1.4960535

Abstract

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 H_α and H_β 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.