Efficiency enhancement of an S-band Magnetically Insulated Line Oscillator

Abstract

An improved Magnetically Insulated Line Oscillator (MILO) operating in S-band was designed using analytical formulation and was simulated using 3D-electromagnetic particle-in-cell (PIC) code. The Dispersion characteristics of the RF interaction structure was analytically obtained using equivalent circuit approach, and subsequently the performance was optimized using particle-in-cell analysis for operation around π- mode resonant frequency of 3.3 GHz. The region of operation of this MILO was obtained under para-potential flow using Hull-cut off and Buneman-Hartree conditions. The design was optimized for improving the efficiency by suitable tailoring of the lengths of cathode, beam dump, extractor cavity gap and the position of stub at the output of the device. The design was performed for 500 kV, 47.5 kA and simulated output power of around 6 GW in TM01 mode could be achieved at the frequency of 3.1 GHz with the power conversion efficiency of around 25%. � 2016 IAMOT.