Design of Magnetically Tunable Magnetron Injection Guns for Gyrotrons at Multiple Frequencies

Dual frequency gyrotron operating at 42/84 GHz for plasma fusion application

“…The Particle-in-Cell (PIC) simulations of beam-wave interaction [22][23][24] are performed to calculate the RF power and frequency and discussed in Section 3 of the manuscript. The magnetically tunable magnetron injection gun (MIG) [18,25] is designed to launch the electron beam at two different radii (calculated according to selected TE modes for 42 and 84 GHz operations) in the interaction cavity and discussed in section 4. Finally, CVD diamond disk window [4,[26][27][28], which must be transparent for 42 & 84 GHz frequencies, is designed and discussed in section 5.…”

“…To achieve the required RF power, an electron beam of 1.2 MW power (80 kV, 15 A) must be launched at the first radial maxima of the co-rotating electric field of the selected operating modes, which are 6.2 mm and 7.3 mm for 42 GHz and 84 GHz operations, respectively. A triode type magnetically tunable magnetron injection gun (MT-MIG) is considered and designed for dual frequency operation of gyrotron [18,25]. In such type of MIG's, the electron beam launching position can be controlled by the magnetic field tuning at cathode and interaction cavity.…”

Thermal analysis of magnetron injection gun for 170 GHz gyrotron

“…At present, most of the electronic optical systems of various gyrotrons use magnetron injection gun (MIG), which can be generally divided into single anode and double anode. Its quality directly affects the performance and life of the gyrotron, so designing a high‐quality electron gun is a very important task 6‐9 …”

“…Its quality directly affects the performance and life of the gyrotron, so designing a high-quality electron gun is a very important task. [6][7][8][9] 2 | MIG THERMAL ANALYSIS PRETREATMENT…”