Perveance of a planar diode with explosive emission finite-diameter cathodes

摘要

Perveance of a planar diode with explosive emission velvet cathodes of 20-100 mm diameters in a range of diode gaps of 0.5-5 cm is investigated experimentally. An empirical universal curve linking the diode perveance and the cathode radius-to-diode gap ratio is determined thus allowing application of a Child-Langmuir model to diodes of finite dimensions. Comparison of experimental results with two-dimensional (2D) computational models is made and a simple method to translate 2D simulation results to the three-dimensional diode configurations is suggested.