A measurement of hydrogen ion transport parameters in Tokamak discharges
- 1 September 1987
- journal article
- Published by IOP Publishing in Plasma Physics and Controlled Fusion
- Vol. 29 (9) , 1077-1092
- https://doi.org/10.1088/0741-3335/29/9/003
Abstract
By modulating the small gas feed required to maintain a steady-state Tokamak discharge a small density perturbation may be induced from whose propagation particle transport parameters may be adduced. Experiments in TEXT show that the phenomena may be adequately described by a simple model with constant diffusion plus inward convection except near the density limit. Diffusion coefficients and convective velocities has been determined for a broad range of hydrogen discharges and found to scale approximately as (nq)-1. The results are plausibly related to impurity transport parameters, thermal diffusivity, and particle confinement times. Diffusion coefficients for deuterium are systematically lower than for hydrogen.Keywords
This publication has 7 references indexed in Scilit:
- Long-Time Impurity Confinement as a Precursor to Disruptions in Ohmically Heated TokamaksPhysical Review Letters, 1985
- Confinement time scaling in TEXTPlasma Physics and Controlled Fusion, 1985
- Transport studies in the TEXT TokamakPlasma Physics and Controlled Fusion, 1984
- Effects of Internal Disruptions on Impurity Transport in TokamaksPhysical Review Letters, 1983
- Transport in tokamaks – a review of experimentNuclear Fusion, 1983
- A density rise experiment on PLTNuclear Fusion, 1982
- Model for particle transport in high-density plasmasNuclear Fusion, 1981