Abstract Details
| status: | file name: | submitted: | by: |
|---|---|---|---|
| approved | non_amb_micro.pdf | 2026-02-28 15:51:26 | Allen Boozer |
Abstracts
Author: Allen H Boozer
Requested Type: Consider for Invited
Submitted: 2026-02-28 15:50:01
Co-authors:
Contact Info:
Columbia University
128 Jerdone Road
Williamsburg, VA 23185
United States
Abstract Text:
Electrostatic microturbulence at a finite plasma pressure produces a turbulent magnetic field, which makes the magnetic field lines chaotic. Quasi-neutrality along the chaotic magnetic field lines requires a variation in the electric potential along the lines to balance the electron pressure gradient. This potential produces radial transport similar to that of the diffusion coefficient D = Δ|dT/dr|/eB, where T is the electron temperature and Δ is the radial distance over which the electric potential is correlated by the electron motion along the chaotic magnetic field. The chaos-produced electron transport gives an effective viscosity on the electron flow, which can counterbalance the non-ambipolar part of the neoclassical ion radial particle diffusion. This non-ambipolarity would otherwise require a radial electric field that confines ions and hence impurities. The maximum non-ambipolar fraction that can be counterbalanced and the required plasma beta to avoid shielding the magnetic perturbations are calculated in terms of Δ. For details see https://arxiv.org/pdf/2601.15661. Supported in part by the U.S. Department of Energy, Office of Science under Award No. DE-AC02-09CH11466.
Characterization: 1.0
Comments: