Formation and dynamics of the electron beam in the electron-optical system of a gyrotron taking into account reflection of electrons from the magnetic mirror
Louksha O. I.
1, Malkin A. G.
1, Apanevich B. R.
11Peter the Great Saint-Petersburg Polytechnic University, St. Petersburg, Russia
Email: louksha@rphf.spbstu.ru
A new technique for taking into account the surface roughness of the thermionic cathode and the spread of initial thermal velocities when performing trajectory analysis in the electron-optical system of a gyrotron is discussed. Using this technique, the parameters of the helical electron beam in a moderate-power gyrotron of the 4-mm wavelength range are determined. Based on the particle-in-cell method, collective processes in the electron space charge trapped between the cathode and the magnetic mirror are simulated. Threshold excitation conditions and amplitude-frequency characteristics of low-frequency oscillations associated with the development of instability in the trapped space charge are determined. A possible relationship between these oscillations and resonant structures existing in the electron-optical system is discussed. Keywords: Microwave electronics, gyrotron, helical electron beam, magnetic mirror, low-frequency oscillations.
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