A more general model for determination of plasma armature current distribution from B-dot voltage by method of least squares

A more general and precise model for the B-dot coil voltage induced by the railgun plasma armature current has been derived and used to obtain armature current distributions. Previously, the voltage model assumed the current elements in the armature were no closer than a bore diameter from the coil....

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Bibliographic Details
Published in:IEEE Transactions on Magnetics (Institute of Electrical and Electronics Engineers); (United States) 1991-01, Vol.27 (1), p.189-194
Main Authors: Cobb, K.K., Villecco, R.
Format: Article
Language:English
Subjects:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700411 - Inertial Confinement Devices- (1992-)
700430 - Fusion Technology- Magnet Coils & Fields- (1992-)
700460 - Fusion Technology- Heating & Fueling Systems
ACCELERATORS
Boring
CALCULATION METHODS
Coils
CURRENT DENSITY
Current distribution
ELECTRIC COILS
ELECTRICAL EQUIPMENT
Fu
Fuels-
LEAST SQUARE FIT
MAGNET COILS
Magnetic flux
MAXIMUM-LIKELIHOOD FIT
NUMERICAL SOLUTION
Plasma accelerators
Plasma density
PLASMA GUNS
Plasma measurements
PLASMA SIMULATION
Plasma sources
RAILGUN ACCELERATORS
Railguns
SIMULATION
Voltage
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Summary:A more general and precise model for the B-dot coil voltage induced by the railgun plasma armature current has been derived and used to obtain armature current distributions. Previously, the voltage model assumed the current elements in the armature were no closer than a bore diameter from the coil. A solution for the coil voltage has been found which eliminates this approximation. In addition, the model has been generalized to include multiple armature currents in any direction perpendicular to the rails, and nonuniform current across the bore. The model is used with least squares reduction, as in previous work. Using this model, current distributions were determined for the square-bore and the MARC IV (four perpendicular armatures) railguns. The results of these reductions are presented.< >
ISSN:0018-9464
1941-0069
DOI:10.1109/20.101022