Title :
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
fDate :
8/1/1994 12:00:00 AM
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˜/kTe, 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;
Journal_Title :
Plasma Science, IEEE Transactions on
