<title>Influence of radiation on virtual cathode triode impedance and voltage pulse</title>

Abstract

The forming of accelerating voltage and current pulses with the given parameters is one of the most significant problems for creating the high-efficiency generators founded on a virtual cathode triode. The experiments have shown, that the nonlinear elements of an electrical circuit influence on the growing slope, amplitude and pulse length. One of nonlinear elements is the radiating triode. The results of theoretical investigations of the emission influence on the virtual cathode impedance and the forming of voltage and current pulses in the circuit with a inductive energy accumulator and exploding wires have been presented in this work. A model has been elaborated , including the influence of the electromagnetic adiation emission on the impedance of virtual cathode triode. The numerical simulation of the transient processes in the electrical circuit has been carried out. The dependences of the voltage and current pulses parameters, the emission efficiency , beam geometry and resonance chamber have been received.The forming of accelerating voltage and culTent pulses with the given parameters is one of the moSt significant problems for creating the high-efficiency generators founded on a virtual cathode triode. There are limiting themselves to the evaluation of the electric circuit for external feeding source as a rule at the investigation of the forming of the voltage and current pulses in a virtual cathode triode. But the complete problem solution has to include the selfconsistent radiation influence on the triode impedance and the voltage pulse.In this work the investigation of the forming of the voltage and cmTent pulses in a virtual cathode triode is carried out with taking into account the radiation influence. The inductive energy accumulators usage is considered in the high voltage sources, that gives possibility to obtain the high densities of the accumulated energy ( 0.5 -5. ) J/cm 3 at a comparatively low specific density. That is essentially higher than densities of the accumulated energy in capacitance energy accumulators. Besides capacitance energy accumulators are more complicated, unwieldly and expensive engineering installations. A prospect of the inductive energy accumulators is more obvious at using magneto-explosive generators for their feeding, what is widely discussed last time. 2.Theoretical modelThe principal elements of an electric circuit of a virtual cathode triode feeding are transformer -the energy accumulator, opening switch, a virtual cathode triode and a sharpening spark gap. Besides there are 254 SPIE Vol. 3158 • 0277-786X197/$lO.OO Downloaded From: http://proceedings.spiedigitallibrary.org/ on 06/23/2016 Terms of Use: http://spiedigitallibrary.org/ss/TermsOfUse.aspx

Electrical explosion process and amorphous structure of carbon fibers under high-density current pulse igniting intense electron-beam accelerator

“…This type of switch is called an electrically explosive opening switch (EEOS) that are suitable for high-voltage pulse generators based on inductive energy accumulators. The EEOS, as a replacement of the large volume transmission line, can directly generate a high-voltage pulse, which enables the simple and compact construction of pulse generators (Grigoryev et al, 1997). The inductive energy accumulator usage is considered in the high-voltage pulse generator, mainly as a result of the possibility to obtain the high densities of the accumulated energy at a relatively low specific density (Chuvatin et al, 2006;Zhang et al, 2008).…”