Abstract
It is shown that electron transport due to a generic low-frequency electrostatic turbulence in tokamak geometry results in the relaxation to a peaked, self-sustained plasma density profile n0(r), rather than to a diffusion-induced flat distribution. The relaxed density profile depends on the magnetic geometry and the distribution of turbulence. The associated inward pinch velocity Vr=D lnn0 results from the competition of the turbulent diffusion of trapped electrons over the poloidal magnetic flux coordinate ψ and the collisional relaxation toward a Maxwellian distribution function.
Original language | English (US) |
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Pages (from-to) | 4436-4439 |
Number of pages | 4 |
Journal | Physical Review Letters |
Volume | 74 |
Issue number | 22 |
DOIs | |
State | Published - 1995 |
ASJC Scopus subject areas
- General Physics and Astronomy