What is it about?

The analytically derived solution for a thin annular electron beam generation in a magnetically-insulated coaxial diode (MICD), a.k.a. “Fedosov solution,” is validated by direct experimental measurements of current-voltage (I-V) characteristics of MICD driven by the high-current electron-beam accelerator SINUS-6 and numerical particle-in-cell (PIC) simulations of a thin annular electron beam generation and propagation in computer model of MICD of corresponding geometry and initial/boundary conditions. The experimental measurements of I-V characteristics of MICD are performed by monitoring and analyzing a voltage applied to MICD and an electron-beam current generated by an explosive-emission cathode of MICD. Numerical simulations of MICD operation are performed using ICEPIC code. The comparisons of analytically derived “Fedosov” solution with experimentally measured I-V characteristics of MICD as well as with results of ICEPIC simulations of a 3D computer model of MICD operation are analyzed and a conclusion is made that all three measures are pretty much consistent with each other. The appliance of the analysis is purposed now in using SINUS-6 accelerator for designing, prototyping and studying different variants of O-type slow-wave high-power microwave/millimeter-wavelength vacuum electronic devices.

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Why is it important?

The overall result of the research described in the article shows importance of the “Fedosov” solution in designing and studying different variants of O-type slow-wave high-power microwave/millimeter-wavelength vacuum electronic devices (HPMVEDs) driven by different variants of thin annular electron beams formed in different variants of magnetically-insulated coaxial diodes (MICDs) driven by the different variants of pulse-power high-current electron-beam accelerators.

Perspectives

This article is an example of taking one physical phenomenon - space-charge limited current in magnetically-insulated coaxial diodes - and studying this phenomenon by using (i) analytical theory derived almost 45 years ago, (ii) experimental measurements performed about 15 years ago when I was a graduate student in the University of New Mexico, and (iii) computer particle-in-cell simulations made during last 1.5 years. We are continuing our analytical, experimental, and computational activities in studying different variants of O-type slow-wave high-power microwave/millimeter-wavelength vacuum electronic devices (HPMVEDs) driven by different variants of thin annular electron beams formed in different variants of magnetically-insulated coaxial diodes (MICDs), which includes, for example, MICDs with double cathodes producing two non-intersecting electron beams experiencing two-stream electron instability when drifting inside slow-wave structures (SWSs) of our HPMVEDs.

Andrey Andreev
University of New Mexico

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This page is a summary of: Direct comparison of analytically derived “Fedosov” solution with experimental measurements and numerical simulations of relativistic thin annular electron beam generation and propagation in magnetically insulated coaxial diode of SINUS-6 high-current ..., Physics of Plasmas, July 2022, American Institute of Physics, DOI: 10.1063/5.0093039.
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