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

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4 Author(s)
Forster, John C. ; Rensselaer Polytech. Inst., Troy, NY, USA ; Schoch, P.M. ; Hickok, R.L. ; Jennings, W.C.

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

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Plasma Science, IEEE Transactions on  (Volume:22 ,  Issue: 4 )