Some effects of MHD activity on impurity transport in the PBX tokamak

Technical Report · Tue Oct 01 00:00:00 EDT 1985

DOI:https://doi.org/10.2172/6414880· OSTI ID:6414880

Ida, K; Fonck, R J; Hulse, R A; LeBlanc, B

The effects of MHD activity on intrinsic impurity transport are studied in ohmic discharges of the Princeton Beta Experiment (PBX) by measuring of the Z/sub eff/ profile from visible bremsstrahlung radiation and the spectral line intensities from ultraviolet spectroscopy. A diffusive/convective transport model, including an internal disruption model, is used to simulate the data. The Z/sub eff/ profile with no MHD activity is fitted with a strong inward convection, characterized by a peaking parameter c/sub v/ (= -a/sup 2/v/2rD) = 11 (3.5, +4.5). At the onset of MHD activity (a large m = 1 n = 1 oscillation followed by sawteeth), this strongly peaked profile is flattened and subsequently reaches a new quasi-equilibrium shape. This profile is characterized by reduced convection (c/sub v/ = 3.6 (-1.1, +1.6), D = 1.4 (-0.7, +5.6) x 10/sup 4/ cm/sup 2//s), in addition to the particle redistribution which accompanies the sawtooth internal disruptions. 10 figs.

• Research Organization: Princeton Univ., NJ (USA). Plasma Physics Lab.
• DOE Contract Number: AC02-76CH03073
• OSTI ID: 6414880
• Report Number(s): PPPL-2264; ON: DE86005037
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700107* -- Fusion Energy-- Plasma Research-- Instabilities
BREMSSTRAHLUNG
CLOSED PLASMA DEVICES
COMPUTERIZED SIMULATION
ELECTROMAGNETIC RADIATION
FLUID MECHANICS
HYDRODYNAMICS
IMPURITIES
MAGNETOHYDRODYNAMICS
MATHEMATICAL MODELS
MECHANICS
PBX DEVICES
RADIATIONS
SIMULATION
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
TRANSPORT