A Study on 94 GHz Low-Voltage, Low-Current Gyrotron

Abstract

A theoretical and experimental study on a 94 GHz low-voltage, low-current gyrotron is presented in this paper. In order to obtain stable radiation and make great use of the equipment in the lab, the TE 6,2 mode is selected as the operating mode of the desired gyrotron. The efficiency of the electron beam interaction with RF fields under different conditions has been calculated by a code, which is based on the self-consistent nonlinear theory for gyrotrons. The gyrotron is equipped with a single-stage depressed collector and a quasi-optical mode converter. Then, a gyrotron with optimized parameters has been designed, constructed, and tested. An output power of 23 kW is obtained at an accelerating beam voltage of 31.5 kV, a beam current of 1.8 A, and a collector depression voltage of 7.4 kV, corresponding to an overall efficiency of 53%.

Design and analysis on a 0.1‐THz second harmonic low‐voltage, low‐current gyrotron with complex cavity

“…The gyrotron operating at frequency around 0.1 THz has been developed for many years . Usually, a superconducting magnet is needed to supply the required external DC‐magnetic field of the gyrotron.…”

“…For the purpose of designing a 10‐kW‐level 94 GHz second harmonic gyrotron with high efficiency, in this article, we present simulation and analysis on the designed gyrotron. In order to achieve the low current or low voltage with high efficiency, a lot of publications have presented related studies . Here, a complex cavity with a throat between the output taper and the second cavity has been used in the design for achieving the startup of the main mode at low‐voltage and low‐current conditions.…”

“…The gyrotron operating at frequency around 0.1 THz has been developed for many years. 10,11 Usually, a superconducting magnet is needed to supply the required external DC-magnetic field of the gyrotron. In some applications, however, the superconducting magnet brings some limitations since it is expensive and has complex system caused by long duration of cooling down process and constant power consumption for maintaining cold temperatures.…”

“…In order to achieve the low current or low voltage with high efficiency, a lot of publications have presented related studies. 11,[16][17][18] Here, a complex cavity with a throat between the output taper and the second cavity has been used in the design for achieving the startup of the main mode at low-voltage and low-current conditions. And, in order to achieve the purpose of quasi-mode converter available and to avoid mode competition, the operating mode pair of TE 7.2 /TE 7.3 is selected synthetically in Section 2.…”

Performance Analysis of a Short-Pulse Marx Generator for High-Power Relativistic Applications With a Solution Load

“…It has also been applied using a long-pulse and relatively high frequency band. Especially, technologies regarding vacuum high-power devices related to pulse radiation in W -band [1] enable us to open up new human-body applications. In this frequency range, the radiated pulse energy from vacuum devices is nonionizing, and it can reach a skin depth of 1/64 of an inch, raising the skin's temperature.…”