A finite element flux-corrected transport analysis on the switching characteristic of high power trigatron

The electric field distributions to polarity change and shape change of electrodes in a high power trigatron were analyzed by finite element flux-corrected transport method (FEM-FCT). The method uses the concept of FEM-FCT, which disperse analytic area by unstructured mesh, is suitable for complex electrode and shorten simulation´s life because it reduce occurrence of unnecessary mesh. The switching characteristic of pulse charged trigatron changed by trigger voltage polarity and main gap voltage polarity. The four polarity combinations were possible. Two homopolarity and two heteropolarity. Among the above four combinations, the heteropolarity configuration with the positive trigger/negative main gap polarity is best in terms of switching characteristic. This paper analyses switching characteristic of high power trigatron with the positive trigger voltage and the negative main gap voltage by FEM-FCT.