Design of a Quasi-Optical Mode Converter for a Dual-Frequency Coaxial-Cavity Gyrotron

Jin, Jianbo; Gantenbein, G.; Ruess, Tobias; Thumm, M.; Jelonnek, John

doi:10.1109/irmmw-thz.2019.8873692

Cited by 2 publications

(1 citation statement)

References 7 publications

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“…Therefore, additionally to the launcher also the mirrors are installed onto the mode generator setup, as presented in the schematic in Fig. 7 The mirror system contains one quasi-elliptical (mirror 1) and two curved mm-wave beam shaping mirrors (mirror 2 and 3) [12]. Fig.…”

Section: Verification Of the Quasi-optical Output Couplermentioning

confidence: 99%

170/204 GHz Dual-Frequency Mode Generator for Verification of the Quasi-Optical Output Coupler of a 2 MW Coaxial-Cavity Gyrotron

Ruess

Gantenbein

Jin

et al. 2022

2022 IEEE 2nd Ukrainian Microwave Week (UkrMW)

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The 2 MW 170 GHz single-frequency coaxial-cavity short-pulse pre-prototype is upgraded to operate also at 204 GHz. Therefore, the quasi-optical output coupler, which is a gyrotron key component, has been modified. Before the newly manufactured quasi-optical output coupler is installed into the gyrotron, a low-power cold measurement for the verification is performed. Therefore, a mode generator is designed and adjusted to excite the relevant operating gyrotron modes, namely the TE34,19 mode at 170 GHz and TE40,23 mode at 204 GHz, with excellent purity and a low counter-rotating amount of < 0.5 % for both modes. The TE40,23 mode is the mode with the highest eigenvalue ever excited in cold tests. After the successful mode excitation, first the fabricated launcher and then the entire quasi-optical output coupler are verified, showing excellent agreement with the simulation.

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Section: Verification Of the Quasi-optical Output Couplermentioning

confidence: 99%