Theory of gyro devices with thin electron beams (large-orbit gyrotrons) |
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Authors: | V L Bratman Yu K Kalynov A É Fedotov |
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Institution: | (1) Institute of Applied Physics, Russian Academy of Sciences, 603600 Nizhnii Novgorod, Russia |
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Abstract: | It is shown for a precisely aligned electron beam of small thickness in a large-orbit gyrotron that high cyclotron harmonics
(up to s⩽5) can be selectively excited with an electronic efficiency that is acceptable for some applications (1–10%). When the quality
of the electron beam is high, the selective properties are maintained even for modes with high radial indices, raising hopes
that this method can be used to obtain coherent radiation not only in the millimeter but also in the entire submillimeter
wavelength range. A method for taking into account the space-charge effects is developed, and it is shown that the corresponding
effects can be important at relatively small values of the electron pitch factor. The results of the analysis and preliminary
experiments reveal the possibility of creating high-power compact sources of submillimeter radiation for the spectroscopy
of various media, the diagnostics of dense plasmas, and some other applications.
Fiz. Tekh. Poluprovodn. 68, 91–98 (October 1998) |
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