Images of turbulence in a tokamak plasma

Author

McKee, G.R. ; Fenzi, C. ; Fonck, R.J.

Author_Institution

Wisconsin Univ., Madison, WI, USA

Volume

30

Issue

1

fYear

2002

fDate

2/1/2002 12:00:00 AM

Firstpage

62

Lastpage

63

Abstract

Two-dimensional measurements of density fluctuations in the DIII-D tokamak, obtained with the Beam Emission Spectroscopy diagnostic, have allowed for construction of images and movies of plasma turbulence which are greatly aiding an understanding of tokamak turbulence phenomena. The measurements are obtained in the radial and poloidal plane at a spatial resolution of near 1 cm (about five ion gyroradii). Assembly of synchronized discrete measurements provides a low spatial resolution, high sensitivity, high throughput, high time resolution (Δt=1 μs) imaging system. These measurements have shed light on such processes as flow shear, turbulent eddy interaction and shearing, and provide direct visualization of long wavelength turbulence in a hot plasma

Keywords

Tokamak devices; flow visualisation; plasma diagnostics; plasma toroidal confinement; plasma turbulence; DIII-D tokamak; Tokamak plasma; beam emission spectroscopy diagnostics; density fluctuations; direct visualization; flow shear; high throughput high time resolution imaging system; hot plasma; image analysis; ion gyroradii; long wavelength turbulence; movies; plasma turbulence visualisation; poloidal plane; radial plane; shearing; spatial resolution; synchronized discrete measurements; tokamak turbulence phenomena; turbulent eddy interaction; two-dimensional measurements; Density measurement; Fluctuations; Particle beam measurements; Particle beams; Plasma density; Plasma diagnostics; Plasma measurements; Spatial resolution; Tokamaks; Wavelength measurement;

fLanguage

English

Journal_Title

Plasma Science, IEEE Transactions on

Publisher

ieee

ISSN

0093-3813

Type

jour

DOI

10.1109/TPS.2002.1003924

Filename

1003924