2D Measurement of Edge Plasma Dynamics by Using High-Speed Camera Based on HeI Line Intensity Ratio Method
✍ Scribed by N. Ohno; K. Miyamoto; K. Kodama; S. Kajita; K. Kitagawa
- Publisher
- John Wiley and Sons
- Year
- 2010
- Tongue
- English
- Weight
- 761 KB
- Volume
- 50
- Category
- Article
- ISSN
- 0005-8025
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✦ Synopsis
Abstract
In order to investigate dynamic plasma behaviors in scrape‐off layer (SOL) regions, such as ELMs and plasma blobs, we have developed a 4‐channel high‐speed camera equipped with four interference filters to obtain 2D successive images of spectral intensity of He I emission lines at 667.8 nm, 706.5 nm and 728.1 nm in addition to HeII at 656.0 nm. By using calculated results based on a Collisional Radiative (CR) model for He, the intensity ratios of the He I lines (728.1/706.5 and 667.8/706.5), provides 2D distributions of the electron temperature and density. The 2D profiles of electron density and temperature reconstructed from 2D images of He I emission lines taken in a small tokamak, HYBTOK‐II were compared with those measured with the triple probe in order to evaluate the accuracy of this diagnostics. Electron density and temperature measured with the 4‐channel high‐speed camera are in good agreement with those obtained with the triple probe (© 2010 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)