Energy Confinement Time and Electron Density Profile Shape in TFTR (Tokamak Fusion Test Reactor).

摘要

The electron density profiles of intense deuterium neutral-beam- heated plasmas (P(sub tot)/P(sub ohm) (gt) 10) are characterized as a peakedness parameter (F(sub ne) = n(sub eo)/(l angle)n(sub e)(r angle)) in the Tokamak Fusion Test Reactor (TFTR). The gross energy confinement time ((tau)(sub E) = E(sub tot)/P(sub tot)) at the time of maximum stored energy is found to be a weak function of the plasma current and total heating power but depends strongly on the peakedness parameter. A regression study showed (tau)(sub E) = 2.4 (times) 10(sup (minus)3)F(sub ne)(sup 0.76)I(sub P)(sup 0.18)P(sub tot)(sup (minus)0.12) for a data set of 561 discharges in the TFTR. Also (tau)(sub E) can be represented as (tau)(sub E) = (tau)(sub E)(sup L)f(F(sub ne)), where (tau)(sub E)(sup L) is the empirical L-mode scaling result. A similar scaling applies to an appropriately defined incremental energy confinement time ((tau)(sub inc) = dE(sub tot)/dP(sub tot)(vert bar)(sub F(sub ne) = constant)). 14 refs., 4 figs.