The Research Of Tunable THZ Gyrotron Pic Simulation

The gyrotron is the important high-power terahertz devices, it is of great value tothe research, and has broad application prospects in the field of physics, biology,materials science, radar and controlled thermonuclear fusion. The general work of theterahertz gyrotron oscillator is at the point frequency, its application is limited. Aimed atstatus of the lack of high-power tunable terahertz, combined with ongoing researchprojects, based on the CHPIC particle simulation developed at the University ofElectronic Science and Technology of China to carry out the the tunable terahertzgyrotron PIC particle simulation.PIC simulation mainly deal with a lot of interaction between charged particles andelectromagnetic fields, using the finite difference time domain (FDTD) method discreteMaxwell’s equations, descripted by the finite-size particle model and promote theparticle motion in discrete grid, PIC particles simulation technology take theelectromagnetic fields on the role of the particles, the particle motion on the effects ofelectromagnetic fields and the space charge effect between charged particles, it is moreperfect to descripte the complex nonlinear interaction between charged particles andelectromagnetic fields, and it is the most important research tool in the vacuumelectronics device.This paper analyzes the PIC simulation principles and basic theory, electro-magnetic field algorithm and particle and field interaction algorithm. To go on the PICsimulation of Tunable terahertz gyrotron, we researched and realized the cyclotronelectron emission boundary conditions and parallel algorithms, by using the CHPICsimulation software to simulate the300GHz high-power tunable gyrotron, and analysedand optimizd the related parameters, simulated the beam-wave interaction. The resultsshow that at the condition of operating voltage of55kV, current3A, the magnetic fieldis adjusted between12T to13T, frequency changes from303.774GHz to316.677GHz,the frequency tuning range at12.903GHz. In an external magnetic field of12T, current3A conditions, the change of the electron beam voltage between50kV-59kV, frequencychange from303.434GHz to304.8GHz and band width is1.366GHz. Through this study, we grasped the method of the tunable terahertz gyrotronfeatures and design initially and laid the foundation for the development of tunableterahertz gyrotron.