Theory and simulation of the cyclotron autoresonance klystron operating at Doppler-shifted cyclotron harmonics

Gennady T. Smirnov

doi:10.1117/12.175770

13 May 1994 Theory and simulation of the cyclotron autoresonance klystron operating at Doppler-shifted cyclotron harmonics

Gennady T. Smirnov

Author Affiliations +

Proceedings Volume 2154, Intense Microwave Pulses II; (1994) https://doi.org/10.1117/12.175770
Event: OE/LASE '94, 1994, Los Angeles, CA, United States

Abstract

A linear analysis and numerical simulation are presented for Doppler-shifted cyclotron harmonics generated in the cyclotron autoresonance klystron 1,2 The harmonic-generation mechanism in the CARK is similar to the one in the ordinary klystron: First, an oscillation at the basic Doppler-shifted cyclotron frequency is excited in the main resonator of the CARK. Then, bunched electron beam excites harmonics in an additional quasi-optical resonator tilted to the main resonator. Because of shortening of wavelength both by harmonic-generation mechanism and Doppler effect very high frequencies are attainable in this device. For example, one could obtain radiation with wavelength of about 0 .I mm using an electron beam with the energy of electrons of about I MeV and a magnetic field of I 00 kG . It is essential, that there is no threshold condition for harmonic generation. Thus, it is possible to generate harmonics even with low electron beam current and/or poor Q-factor of a resonator. It is shown, that the efficiency of generation of the low harmonics (harmonic number 2÷5) can exceed I 0%. The efficiency of generation of the I 0th harmonic can be of the order I %. Comparative analysis of the CARK harmonic generator and the FEL harmonic generator is given

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Gennady T. Smirnov "Theory and simulation of the cyclotron autoresonance klystron operating at Doppler-shifted cyclotron harmonics", Proc. SPIE 2154, Intense Microwave Pulses II, (13 May 1994); https://doi.org/10.1117/12.175770

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