Abstract
Development of Terahertz-Range Planar Gyrotrons with Transverse Energy Extraction Operating at Cyclotron Harmonics
Highlights
For drastic increase in the output power of shortwavelength gyrotrons, we suggest to use the planar scheme with a sheet electron beam and transverse electromagnetic energy extraction (Fig.1b)
It is important to note that in the existing cryomagnets, the warm bore is sufficient for a drastic increase of cross-sections of terahertz-range gyrotrons and provides enough space for installation of additional reflectors required for arrangement of transmission of generated radiation in the direction of collector
In simulations competitions of operating TE20,1 at the 2nd cyclotron harmonic and parasitic TE9,1 modes at the 1st cyclotron harmonic was taken into account (Fig.3)
Summary
For drastic increase in the output power of shortwavelength gyrotrons, we suggest to use the planar scheme with a sheet electron beam and transverse (with respect to the electrons translation velocity) electromagnetic energy extraction (Fig.1b). The main advantage of this scheme comparing to the conventional cylindrical geometry is the possibility of effective mode selection over the open transverse coordinate in combination with radiation out-coupling, which leads to substantial reduction of Ohmic losses [6]. It is important to note that in the existing cryomagnets, the warm bore is sufficient for a drastic increase of cross-sections of terahertz-range gyrotrons and provides enough space for installation of additional reflectors required for arrangement of transmission of generated radiation in the direction of collector.
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