基于射频负离子源的中性束注入系统是高功率长脉冲（稳态）运行中性束注入系统的最佳选择。负离子源是中性束注入系统的核心部件，需要实现稳定的负离子束引出和加速。在负离子源的运行过程中引出负离子电流会发生变化，尤其在长脉冲、高能量运行条件下会更加明显，因此无法满足稳定运行的要求。为了实现引出束流的稳定引出，开展了束流反馈控制研究，研发了一套基于射频功率调节的束流反馈控制系统，并将束流反馈控制系统应用在射频负离子源测试平台，开展了束流反馈控制测试。测试结果表明束流反馈控制系统能够实现对束流的实时反馈调节以获得束流的稳定引出，验证了基于射频功率调节的束流反馈控制的可行性，为高功率射频负离子源的研制提供支持。

Neutral beam injection systems based on RF negative ion sources are the best choice for high power long pulse (steady-state) operation of neutral beam injection systems. The negative ion source is the core component of the neutral beam injection system, which needs to achieve stable negative ion beam extraction and acceleration. During the operation of the negative ion source, the negative ion current will change, especially under long-pulse and high-energy operating conditions, so it cannot meet the requirements of stable operation. To achieve a stable extraction of the extracted beam, the research on beam feedback control was carried out and a beam feedback control system based on RF power adjustment was developed. The beam feedback control system has been applied in the RF negative ion source test platform. The test results show that the beam feedback control system can realize real-time feedback adjustment of the beam to obtain stable extraction of the beam. Beam feedback control based on RF power regulation is feasible, which provides support for the development of high-power RF negative ion sources.