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Calculations of the effects of incomplete preionization in high voltage theta pinches

Journal Article · · Phys. Fluids; (United States)
DOI:https://doi.org/10.1063/1.862383· OSTI ID:7082413
The hybrid model presented previously has been extended to include the effects of incomplete pre-ionization by the addition of a multistep ionization process. The difference between a fully pre-ionized and a weakly pre-ionized implosion is illustrated, and the predictions of the model are compared with data from high voltage theta-pinch experiments by illustrating the degree to which the computed density and magnetic field profiles agree with experiment. Due to incomplete pre-ionization, all the plasma at a point is not accelerated simultaneously by the sheath, so that the radial density profiles are broader and the peak densities are lower than in the corresponding fully pre-ionized implosion. A differential rotation of the imploding plasma column is shown to affect the implosion dynamics and radial density distribution. It is demonstrated that the withdrawal of flux from the tube during a staged theta pinch experiment may result in plasma hitting the wall and traumatizing it.
Research Organization:
Los Alamos Scientific Laboratory, University of California, Los Alamos, New Mexico 87545
OSTI ID:
7082413
Journal Information:
Phys. Fluids; (United States), Journal Name: Phys. Fluids; (United States) Vol. 21:8; ISSN PFLDA
Country of Publication:
United States
Language:
English

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Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700101* -- Fusion Energy-- Plasma Research-- Confinement
Heating
& Production
BOLTZMANN-VLASOV EQUATION
CONTINUITY EQUATIONS
DIFFERENTIAL EQUATIONS
ELECTRON DENSITY
ELECTRON TEMPERATURE
EQUATIONS
HEATING
IMPLOSIONS
IONIZATION
LINEAR PINCH DEVICES
LINEAR THETA PINCH DEVICES
MAGNETIC FIELD CONFIGURATIONS
MATHEMATICAL SPACE
OPEN PLASMA DEVICES
PHASE SPACE
PINCH DEVICES
PINCH EFFECT
PLASMA HEATING
PLASMA SIMULATION
SCYLLA DEVICES
SPACE
THERMONUCLEAR DEVICES
THETA PINCH