Thus the optimum values of the focusing magnetic field, electron beam and helical slow wave system can be obtained.The theory presented here can provide a strong basis for design of the helix TWT.

• 优化设计聚焦磁场、电子注和螺旋线慢波系统的参量可以对螺旋线行波管的稳定性分析提供必要的依据。