2011•Physical Review LettersRequires access
Density Gradient Stabilization of Electron Temperature Gradient Driven Turbulence in a Spherical Tokamak
Y. Ren, S. Kaye, E. Mazzucato, W. Guttenfelder, R. E. Bell, C. W. Domier, B.P. LeBlanc, K. C. Lee, Neville C. Luhmann, D. R. Smith, H. Yuh
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Abstract
In this Letter we report the first clear experimental observation of density gradient stabilization of electron temperature gradient driven turbulence in a fusion plasma. It is observed that longer wavelength modes, k(⊥)ρ(s) ≲ 10, are most stabilized by density gradient, and the stabilization is accompanied by about a factor of 2 decrease in the plasma effective thermal diffusivity.