Wenlong Chen

Magnetic Focusing Simulator: A 3-D Finite-Element Permanent-Magnet Focusing System Design Tool

This paper reports the development of a 3-D finite-element design tool for the design of permanent-magnet focusing system called the magnetic focusing simulator (MFS). It is a new module of microwave-tube simulator suite developed by the University of Electronic Science and Technology of China. MFS specifically targets problem classes including periodic permanent magnet, wiggler, permanent-magnet quadrupoles, periodic cusped magnet, and so on. MFS is a finite-element code of magnetic scalar potential and is a solver of magnetostatic field. It can be used for designing, optimizing, testing, and validating the permanent-magnetic focusing systems. The theory of MFS is discussed in detail in this paper. Besides, the accuracy is compared with the commercial software ANSYS Maxwell, and the performance of MFS is also shown.

An improved magnetic field simulator-MFS

MFS, An improved magnetic field simulator, is a 2-D and 3-D code with finite element method. It can be used to model and design focusing system with periodic permanent magnet (PPM) in the microwave tubes. The results are very close to the results of Ansoft-Maxwell.

3D symmetric computation algorithm with finite element method for permanent magnet focusing system

In this paper, 3D symmetric computation algorithm with finite element method for permanent magnet focusing system is presented. The algorithm is implemented in magnetic field simulator (MFS). The Comparisons of symmetric and full computation shows that symmetric computation can reduce the computational time and the computer memory effectively without decreasing the computational accuracy.

Adaptive mesh refinement using in EOS

In order to improve the computational accuracy, an adaptive mesh refinement has been developed. This adaptive mesh refinement method has been used to improve the mesh for static field and electron trajectories respectively.

Thermal analysis of Helix Slow-Wave Structure using finite element method

Helix TWTs are one of the important components in communication systems, radar, medical systems and scientific research areas. Using the finite element method, a software package named Thermal Simulator (TS) which is a part of Microwave Tube Simulator Suite (MTSS) and can be used for thermal analysis of Helix Slow-Wave Structure was developed. To validate TS, numerical results for a helix slow-wave structure are compared with ANSYS.

Thermal analysis of TWT collector using finite element method

With the increase in power and miniaturization of TWTs, the thermal analysis of collector becomes necessary. Using the finite element method, a software package Thermal Simulator (TS) which is a part of Microwave Tube Simulator Suite (MTSS) and can be used for thermal analysis of collector was developed. To validate TS, numerical results for a one-stage collector are shown compared with ANSYS.

The sensitivity analysis of the PPM stack with notched magnet

A periodic permanent magnet (PPM) stack with notched magnet is discussed in this paper. A fully three dimensional (3D) magnetic focusing simulator (MFS) has been used to model the PPM stack with notched magnet. The influence of changing notched size of magnet is shown by MFS. And the influence of changing materials coercive field is also shown by MFS.