First results from plasma edge biasing on SPECTOR
Abstract
A description of an edge-biasing experiment conducted on the SPECTOR (Spherical Compact Toroid) plasma injector is presented, along with initial results. The insertion of a disc-shaped molybdenum electrode (probe), biased at up to +100V, into the edge of the CT (Compact Torus), resulted in up to 1kA radial current being drawn. Core electron temperature, as measured with a Thomson-scattering diagnostic, was found to increase by a factor of up to 2.4 in the optimal configuration tested. H_alpha intensity was observed to decrease, and CT lifetimes increased by a factor of up to 2.3. A significant reduction in electron density was observed; this is thought to be due to the effect of a transport barrier impeding CT fueling, where, as verified by MHD simulation, the fueling source is neutral gas that remains concentrated around the gas valves after CT formation.
Cite
@article{arxiv.1909.07463,
title = {First results from plasma edge biasing on SPECTOR},
author = {Carl Dunlea and General Fusion Team and Chijin Xiao and Akira Hirose},
journal= {arXiv preprint arXiv:1909.07463},
year = {2020}
}
Comments
15 pages, 13 figures