Investigation of damage traces on the SWS of the RBWO with a low guiding magnetic field

Abstract

For the high power microwave (HPM) generator, damage on an RF structure surface is harmful for a long time operation. In this paper, we investigate damage traces on slow-wave structure (SWS) of the relativistic backward-wave oscillator (RBWO) with a low guiding magnetic field. By theoretical and experimental analysis, we find that damage traces on SWS surface are mainly caused by the bombardment of beam electrons pulled back. Moreover, it is suggested that damage traces are not caused by RF breakdown, the bombardment of secondary electrons, and the bombardment of particles from collector plasma. Importantly, to decrease damages and prolong the working life of the RBWO with a low guiding magnetic field, the electric field which pulls electrons to the RF structure surface (saying Ez and −Er) should be decreased by special design for the RF structure, such as blending and parameters adjustment. Those results may offer benefit guides for study of the RBWO with a low guiding magnetic field.

Investigation of Beat Wave Propagation along Lossy Dielectric Bar for Wind Tunnel Microwave Experiments

“…High-power microwave (HPM) radiation presents a great threat to an aircraft's electronic system and has been widely used for military applications [1][2][3][4]. As microwaves can heat dielectric materials effectively [5][6][7][8][9], in a high-speed air current the absorbing coating on the aircraft's surface will suffer a harmful heating process.…”

Experimental research based on a C-band compact transit-time oscillator with a novel diode loading an embedded soft magnetic material and shielding structure

“…In recent years, there have been many research reports in this area. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] A transit-time oscillator (TTO) is a type of HPM source that has the potential to be miniaturized and compact due to its simple structure, which can work efficiently with a low external guiding magnetic field. This kind of device has attracted increasing interest from researchers.…”