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1. Taking the conventional gyrotron and quasi-optical gyrotron for examples, nonlinear analysis on beam to wave interaction is carried out.

2. The gyrotron traveling-wave tube ( gyro-TWT ) amplifier is a coherent electromagnetic radiation source with the capabilities of high power, high frequency, and broad bandwidth.

3. Finally , the problem in gyrotron transmitter is pointed out.

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4. The identification of mode compositions of gyrotron output power is discussed by using far-field radiation pattern analysis.

5. The mechanism of suppressing mode competition in gyrotron traveling wave tube amplifier with helical corrugation is illuminated.

6. A complex-cavity gyrotron is analysed and calculated in the paper.

7. Gyrotron traveling wave amplifier is a very important high power millimeter wave source for radar applications.

8. The fast wave device gyrotron is base on the radiation theory which is excitated by electrons cyclotron resonance. Its frequency is very high especially at the millimeter and sub-millimeter wave band.

9. Mode selection of a moderate power gyrotron operating at the ISM frequency and the second harmonic is discussed in detail.

10. The experiment of using the gun in Gyrotron shows that the gun has advantages over that one with crossed trajectories.

11. A general theory is developed on the open resonator with rotational symmetric wave-guides which have been used extensively in the electron cyclotron maser (gyrotron).

12. A gyrotron oscillator employing the hybrid interaction scheme can realize highly efficient, high-power output and broadband continuous magnetic tuning in millimeter wave band.

13. The setting of parameters used in the quasi-optical mode converter for this gyrotron is very critical.

14. This thesis analyse the linear theory of Gyro-TWT with spiral corrugated waveguide and two-beam coaxial gyrotron.

15. The results show that the optimum profile of the applied magnetic field in the gyrotron is the cubic shape and the next best is the parabola which the maximum is not at the end of interaction region.

16. In this paper, the method of numerical calculation of the adiabatic electron gun used in gyrotron is discussed.

17. The author intend to find a solution for the computation of non-linear magnetic fields, improve our CAD software, and in addition design a magnet system for a gyrotron.

18. In this paper the engineering design method of the Gyrotron gun is presented after describing the characteristics of the Gyrotron gun.

19. The physical mechanism of efficiency enhancement with varying magnetic field and its effect on the gyrotron operation are discussed.

20. A new type high current relativistic device—high current relativistic gyrotron with plasma is described in this paper.