Current distribution and inductance calculations for railgun conductors
Abstract
A method for calculation of the current density distribution, magnetic field, and inductance of railgun or flux compression generator rails, or other long, parallel conductors of arbitrary cross section, in the high frequency limit is described. The results represent initial estimates of these quantities in railgun circuits before current or magnetic field diffusion has significantly changed the current distribution. The numerical procedure determines the current density distribution using an existing technique originally developed for calculation of charge distribution on equipotential surfaces. The inductance and magnetic field are calculated from the current distribution. Calculations were performed for four systems: two cylindrical conductors, two rectangular conductors, two rectangular conductors in a tube, and flux compression generators used at Los Alamos National Laboratory. Inductances of two rectangular conductors and of flux compression generators were fitted to empirical equations to simplify their further use. Calculated current distributions and inductances were compared with other theoretical calculations and with measured data. The comparisons indicate that results from this method accurately predict the current density distribution and inductance of these systems in the high frequency limit.
 Publication:

NASA STI/Recon Technical Report N
 Pub Date:
 November 1981
 Bibcode:
 1981STIN...8229551K
 Keywords:

 Current Density;
 Distribution (Property);
 Inductance;
 Magnetic Fields;
 Railgun Accelerators;
 Computation;
 Conductors;
 Current Distribution;
 High Frequencies;
 Numerical Analysis;
 Predictions;
 Electronics and Electrical Engineering