Open AccessImproved confinement with reversed magnetic shear in TFTR
Author(s) -
F.M. Levinton,
S.H. Batha,
M. C. Zarnstorff
Publication year - 1995
Language(s) - English
Resource type - Reports
DOI - 10.2172/93983
Subject(s) - tokamak fusion test reactor , thermal diffusivity , tokamak , atomic physics , plasma , magnetic confinement fusion , electron density , electron , physics , electron temperature , shear (geology) , plasma confinement , beta (programming language) , nuclear physics , materials science , thermodynamics , computer science , programming language , composite material
Highly peaked density and pressure profiles in a new operating regime have been observed on the Tokamak Fusion Test Reactor (TFTR). The q-profile has a region of reversed magnetic shear extending from the magnetic axis to r/a {approximately}0.3-0.4. The central electron density rises from 0.45 x 10{sup 20} m{sup {minus}3} to nearly 1.2 x 10{sup 20} m{sup {minus}3} during neutral beam injection. The electron particle diffusivity drops precipitously in the plasma core with the onset of the improved confinement mode and can be reduced by a factor of {approximately}50 to near the neoclassical particle diffusivity level