PIC Modeling of the Self-Oscillatory Generation of a Continuous RF Train of Short Electron Bunches in a Vircator with a Magnetic Mirror
Herman N. Kolesov1, Alexander E. Dubinov1; Russian Federal Nuclear Center—All-Russia Scientific and Research Institute of Experimental Physics (RFNC-VNIIEF), Sarov, 607188 Russia
Abstract
PIC modeling of a coaxial vircator driven by an prelimit high-current relativistic electron beam in an external inhomogeneous magnetic field has been carried out. The vircator geometry represents a coaxial cavity with metal walls. A hollow prelimit relativistic electron beam with an injection current of 18 kA and an electron injection energy of 1 MeV is injected along the axis from the left. Continuous oscillation of the electron charge in the cavity has been discovered, with a characteristic period of ~32 ns. Each oscillation period consists of an electron accumulation phase, followed by a phase of electron dumping onto the cavity walls. This oscillation is shown to be associated with the periodic formation of a squeezed state of beam and its transition to a two-stream state. The alternation of these states occurs continuously for a duration exceeding 1 us. The discovered operating regime of the vircator can be used to generate an RF sequence of UWB pulses.
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Herman N. Kolesov
Russian Federal Nuclear Center—All-Russia Scientific and Research Institute of Experimental Physics (RFNC-VNIIEF), Sarov, 607188 Russia
Russia
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