Gyrotron Magnetron Injection Gun Design

Gyrotron has the superiorities, high peak power and high average power. So Gyrotron is vastly applied in many areas, such as plasma heating, controlled thermonuclear fusion(CTF), radar, communication, electron countermeasure . Especially in later thirty years, gyrotron has been payed much respect in Russia, America, France, Swiss, Japan, German and so on. Interiorly, the UESTC High Power Microwave Laboratory has studied gyrotron since the late 1970s and reach advanced level internationally. Magnetron Injection Gun (MIG) provides the helical ring beam. The beam characteristics affect interaction output power and efficiency directly. As the key part of gyrotron, MIG is also studied great. Combining with the prospect of our laboratory, design the single-beam double-anode MIG and obtain better optimization result. Meanwhile, to meet the need of the high power continuous wave (CW) in international thermonuclear experiment reactor(ITER), the study of new double-beam coaxial gyrotron is developing in many countries such as German. In this paper, study the double-beam coaxial MIG and achieve ideal output. The main works of the dissertation are listed as following:Fist, know the theorical basis and software use of EGUN, MAGIC. Represent the theory and calculation method of electron optics.Second, represent the operating principle of MIG and make the detailed analyse. Represent the initial design method and optimization means. Discuss the important elements that affect beam velocity ratio and velocity spread.Third, modulate the double-anode MIG and obtain a series of significative inclusions. Study shows finishing initial design of gun we can optimize the beam performance by adjusting magnetic field distribution, gun geometry, cathode magnetic field, magnetic field compression ratio, anode voltage, cathode emitter temperature and so forth. Especially, analyze qualitatively the effect that the cathode magnetic field angle contributes to beam ratio and prove it by calculation.Fourth, set up the model of the double-beam coaxial MIG, and make theorical analysis and design of double-beam coaxial MIG. Due to applying double beams, the velocity spread is lower because of smaller influence of space charge compared with single beam MIG. In the interaction region this beam is easy to start oscillation and reject mode competition effectively.