Details

Autor(en) / Beteiligte

• Novak, E. M.
• Kalynova, G. I.
• Savilov, A. V.

Titel

Modeling of Selective Photonic-structure Cavities for Sub-terahertz High-cyclotron-harmonic Gyrotrons

Ist Teil von

• 2024 Photonics & Electromagnetics Research Symposium (PIERS), 2024, p.1-6

Ort / Verlag

IEEE

Erscheinungsjahr

2024

Quelle

IEEE Xplore

Beschreibungen/Notizen

• Typically, cavities of sub-terahertz electron cyclotron masers (gyrotrons) have oversized dimensions. That leads to a problem of the mode selectivity in the process of realization of gyrotrons operating at high cyclotron harmonics. In this work, we study a cavity based on a photonic structure formed by two parallel corrugated mirrors acting as two diffraction gratings. Such a system supports only high-Q transverse modes with cutoff frequencies placed in a narrow band close to the corresponding Bragg-type resonance. In this work, a 2D model of a 90GHz Bragg-type gyrotron cavity has been developed and simulated. On the basis of HFSS modeling, the data of eigenfrequencies and Q-factors for such a system are systematized. In addition, estimations for starting currents of gyrotrons based on the photonic-structure cavity are obtained.