An axially extracted virtual cathode oscillator designand characterization

Thesis Type: Postgraduate

Institution Of The Thesis: Orta Doğu Teknik Üniversitesi, Faculty of Engineering, Department of Electrical and Electronics Engineering, Turkey

Approval Date: 2018


Supervisor: ŞİMŞEK DEMİR


This thesis investigates axially extracted virtual cathode oscillator, which is one of the HPM sources, in several aspects. First, the cathode ring structure is defined, and effects of that structure are interpreted. Besides, the dependency between current density characteristics in the diode region of the studied vircator and the defined power conversion efficiency is shown. Moreover, the input characteristic of the vircator is examined in terms of the applied inlet voltage and corresponding inlet current. By taking these waveforms into consideration, the input port of the vircator is modeled with an equivalent electric circuit. Then, the variation of the modeled electric circuit component values with respect to the vircator's design parameters is analyzed.