Abstract
We study, both theoretically and experimentally, the possibilities of improving the output characteristics of a nonrelativistic diffraction radiation generator (DRG) by creating a local inhomogeneity of the magnetostatic field (LIMF) in the electron-wave interaction region. The LIMF was created in a homogeneous focusing magnetic field using a ferromagnetic rod. We found relationships for calculation of the main characteristics of the LIMF and showed the dependence of the start current on the size of the rod and its location relative to the interaction region. The theoretical results were confirmed by the experimental studies of DRGs in the frequency range 40 to 170 GHz. It is shown that the use of an LIMF improves the start, power, and spectral characteristics of the DRG. We conclude that the proposed technique is useful for designing lowvoltage generators with improved output characteristics at short millimeter and submillimeter wavelengths.
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