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 Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
• 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
IMPURITIES
TRANSPORT
PBX DEVICES
MAGNETOHYDRODYNAMICS
BREMSSTRAHLUNG
COMPUTERIZED SIMULATION
MATHEMATICAL MODELS
CLOSED PLASMA DEVICES
ELECTROMAGNETIC RADIATION
FLUID MECHANICS
HYDRODYNAMICS
MECHANICS
RADIATIONS
SIMULATION
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
700107* - Fusion Energy- Plasma Research- Instabilities