多电源协同供电的快响应平顶脉冲强磁场波形调控方法研究

脉冲强磁场下的回旋管可产生更高极限频率和功率的太赫兹波，应用前景巨大，但受磁场波形限制，现有脉冲场回旋管工作时间短、稳定性差。平顶脉冲磁场兼具高场强和高稳定度的优点，是解决上述问题的有效手段。但是，平顶脉冲磁场系统的电流峰值高达数万安培、负载电惯性大且非线性时变，使得快响应高精度磁场波形调控极具挑战，现有技术方案难以满足需求。为此，本项目提出基于多类储能元件的多电源协同供电拓扑结构和高通流能力主动电流线性调控方法，构建脉冲磁体和回旋管的多物理场耦合模型、磁场波形调控系统分析模型，研究强电-磁-热耦合效应下的负载特性、电源间换流瞬态过程及能量调度策略和磁场波形调控方法，探明协同供电拓扑和主动电流调控网络端口特性，明确平顶脉冲磁场系统设计原则，满足平顶脉冲负载对瞬时和平均功率的需求，实现快响应高精度平顶磁场调控，为延长脉冲场回旋管太赫兹波辐射时间、提高输出稳定性奠定基础。

The Gyrotron working under the pulsed magnetic field is highly promising for applications with its ability of generating terahertz radiation with ultimate frequency and power.However, the existing cyclotrons based on pulsed magnetic fields have short output duration and poor stability due to the limitation of magnetic field waveform.Flat-top pulsed magnetic field has the advantages of both high field strength and high stability, the application of which is an effective means to solve the problems above. However, the flat-top pulse magnetic field system has a peak current of up to tens of thousands amperes and a load with the large electric inertia and time-varying nonlinearity. The existing solutions cannot meet the requirement. For this purpose, a multi-stage power supply topology based on multiple types of energy storage elements and a linear regulation network for active current with high flow capacity are proposed, the multi-physics field coupling model of pulsed magnets and gyrotrons are built, and the model of magnetic field waveform regulation system are constructed to study the load characteristics under the effect of the strong electrical-magnetic-thermal coupling. The transient process of current exchange between power supplies and energy scheduling strategy, and the magnetic field waveform regulation method are also studied. The characteristics of the cooperative power supply topology and current regulation network ports are investigated, and the design principles of the flat-top pulsed magnetic field system is clarified to meet the instantaneous and average power requirements of the flat-top pulsed loads and achieve high-precision flat-top magnetic field regulation. The above researches lay a foundation for improving the duration and stability of the terahertz radiation of gyrotrons under pulsed magnet.