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The gyrotron oscillator has been demonstrated as one of the leading candidates for powerful sub-millimetre and millimetre wave generation1. However, this device is not yet widespread in the THz frequency range due to the requirement of intense external magnetic field. To solve this problem, a high harmonic operation of the gyrotron should be considered. A large orbit gyrotron2 (LOG), by restricting...
A 0.42 THz fourth-harmonic large orbit gyrotron (LOG) operating with TE4,2 mode is designed and studied. Unlike the widely used TEm, 1 mode in previous high harmonic (harmonic number s>=4) LOGs, the increase of radial index from 1 to 2 and even larger values bears the potential to enhance the beam-wave interaction efficiency as well as to decrease the cavity wall loss. 3D PIC simulation has shown...
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