Influence of Nonuniform External Magnetic Fields and Anode-Cathode Shaping on Magnetic Insulation in Coaxial Transmission Lines
LOS ALAMOS SCIENTIFIC LAB ALBUQUERQUE NM
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Coaxial transmission lines, used to transfer the high voltage pulse into the diode region of a relativistic electron beam generator, have been studied using the two-dimensional time-dependent fully relativistic and electromagnetic particle simulation code CCUBE. A simple theory of magnetic insulation that agrees well with simulation results for a straight cylindrical coax in a uniform external magnetic field is used to interpret the effects of anode-cathode shaping and nonuniform external magnetic fields. Loss of magnetic insulation appears to be minimized by satisfying two conditions 1 the cathode surface should follow a flux surface of the external magnetic field 2 the anode should then be shaped to insure that the magnetic insulation impedance, including transients, is always greater than the effective load impedance wherever there is an electron flow in the anode-cathode gap.
- Electric Power Production and Distribution
- Particle Accelerators