Li Tianming

Improved method for analyzing quasi-optical launchers

An improved method for analyzing the radiation characteristic of the quasi-optical launcher is presented. The launcher is decomposed into an open-ended waveguide and a helical cut according to the proposed method. The radiation from the open-ended waveguide is obtained by using the Stratton—Chu formulation. The helical cuts radiation is calculated based on its current distribution, gained by several iterative computations, which helps to improve the calculation accuracy since the diffraction effect introduced by the helical cut is considered during the calculation. The proposed method is used to study different launches, and the results are compared with the existing results. Good agreement is achieved between the results obtained from our proposed method and the reported results. The present results provide an alternative for analysis and synthesis of the optical-mode converter.

A W-band sixth-harmonic magnetron-type slotted peniotron

This paper has numerically investigated operating characteristics of a w-band six-harmonic magnetron-type slotted peniotron with 7 vanes. With the new structure design, a high efficiency of 40% w-band 30 kW medium power microwave source has been achieved and the mode competition can be somewhat suppressed. The main advantage of such a peniotron, based on a permanent magnet, is that it can have much more compact size and lower cost, and its operation gap can be greatly reduced.

The permanent magnet design of a w-band high harmonic peniotron

This paper has numerically investigated and tested the characteristics of permanent magnet among the w-band six-harmonic magnetron-type slotted peniotron, which can well satisfy the requirement of the magnetic field of the interaction and the reversal field of the larger-orbit electron gun. Based on a permanent magnet system, the main advantage of such peniotron is that it can have much more compact size and lower cost and its operational gap can be greatly reduced.

A experimental investigation of relativistic magnetron with permanent magnet

A relativistic magnetron with permanent magnet has been designed, fabricated and tested. An output power of 430 MW in S-band has been obtained in experiments.