Study of density and potential fluctuations in the TEXT tokamak with a heavy ion beam probe

Author

Forster, John C. ; Schoch, Paul M. ; Hickok, Robert L. ; Jennings, William C.

Author_Institution

Rensselaer Polytech. Inst., Troy, NY, USA

Volume

22

Issue

4

fYear

1994

fDate

8/1/1994 12:00:00 AM

Firstpage

359

Lastpage

362

Abstract

A heavy ion beam probe was used to study the characteristics of density and potential fluctuations in the TEXT tokamak. Fluctuations of density and space potential are nearly Boltzmann like, n˜/n~φ˜/kT_e, near the edge of the plasma (0.8<r/a<0.9). Potential fluctuations are proportionally greater in the edge region (r/a>0.9). The turbulent E&oarr;×B&oarr; radial particle flux is sufficient to account for all of the particle loss from the tokamak. No poloidal asymmetries, within a poloidal angle range of about 70°, are observed in the fluctuation levels. The fluctuation spectral shape, the density potential phase angle, and the fluctuation propagation speed show a strong radial dependence

Keywords

Tokamak devices; electric potential; fluctuations; ion beam applications; ion beams; plasma density; plasma probes; plasma toroidal confinement; TEXT tokamak; density fluctuations; density potential phase angle; fluctuation levels; fluctuation propagation speed; fluctuation spectral shape; heavy ion beam probe; nearly Boltzmann like fluctuations; particle loss; plasma edge region; poloidal angle range; poloidal asymmetries; potential fluctuations; radial dependence; space potential; turbulent radial particle flux; Density measurement; Energy measurement; Fluctuations; Ion beams; Plasma accelerators; Plasma density; Plasma measurements; Plasma temperature; Probes; Tokamaks;

fLanguage

English

Journal_Title

Plasma Science, IEEE Transactions on

Publisher

ieee

ISSN

0093-3813

Type

jour

DOI

10.1109/27.310641

Filename

310641