DG型电子加速器自校正扫描系统的研制

为了提高DG型电子加速器束流扫描均匀度、解决束流中心偏移、提升束流引出效率，开发了一种既可实现X,Y两相互垂直方向均匀扫描又可以实现束流中心自动对中调节的扫描系统。介绍了扫描磁铁及其电源参数的选取依据，阐述了将扫描磁铁和束流校正线圈进行整体式设计的扫描系统扫描电流成形方式及自动对中电路信号调制过程，包括为提高加速器运行安全性而设计的连锁保护信号。产业化现场使用事实已证明,该系统设计完全达到了设计要求，具有优良的扫描均匀度和长时间工作稳定可靠性。

Development of self correcting scanning system for DG type electron accelerators

To improve the scanning uniformity and beam extraction efficiency, and to solve the problem of beam central deviation of DG type electron accelerators, a scanning system has been developed, whose scanning coil and self correcting coil are set in the same magnetic core. The system can scan along the X and Y axes and adjust the beam to the centre of the extraction window automatically. This paper introduces the parameter selection basis of scanning magnet and scanning power supply. We expound the design principle of the shaping circuit of the triangle wave current based square wave voltage. Moreover, the interlock signal from the scanning system is used to ensure the accelerator’s operation safety and stabilization. It is proved that the scanning system completely achieves the industrialization demand and the scanning uniformity meets the industrial irradiation requirements by the fact that the accelerator with the steady self correcting scanning system is successfully used in practice.