Abstract
The plasma-filled diode (PFD) consists of a low-density plasma injected into a diode in a pulse-powered device. The PFD has been used as a prepulse suppression switch and as a combination opening switch/e-beam diode for use in inductive energy storage devices. The plasma initially provides a low-impedance load. However, as the current increases the impedance eventually rises rapidly, opening the switch. The behavior of this device has been examined using the 2-1/2-D electromagnetic particle code ISIS. A TEM wave was launched down a coaxial transmission line that feeds into a PFD. Particle emission was allowed from the electrodes in an azimuthally symmetric cylindrical geometry. The investigation included an examination of the magnetic field penetration of the plasma, the motion of the electron beam, and the formation of sheaths at the electrodes. The plasma density and injection speed were varied as were wave parameters. >
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