摘要：In this paper, we report the design and simulation of a wire scanner for the linac of the CSNS （China Spallation Neutron Source）. The wire scanner is used to measure the transverse beam profile and the emittance. The effect of beam energy change upon the mechanical design of the wire scanner must be considered. The simulation results of heat on the two specified wires, tungsten and carbon, by using the finite element method software, ANSYS, are presented. In addition, the effect of wire deformation on the beam profile measurement is qualitatively analyzed, and the signal level of the wire scanner is discussed.

摘要：前室真空盒是BEPCⅡ储存环上的基础部件,它是与真空泵、光子吸收器、束流监测器、磁铁等设备紧密相连的接口,其设计、制造是BEPCⅡ的重要环节。文中提出了BEPCⅡ储存环前室真空盒的结构设计方案,完成了真空状态下前室真空盒结构有限元分析,样机的设计、制造和试验,检测结果表明设计的合理性,目前BEPCⅡ前室真空盒已投入批量生产。

摘要：相敏解调是电容层析成像(ECT)系统中的关键环节。传统的模拟解调存在着精度低、噪声大和模拟器件的稳定时间过长等问题,成为进一步提高ECT系统精度和速度的"瓶颈"。为此,设计了一种基于FPGA的数字相敏解调方法,实现了快速、高精度的有符号数字相敏解调。验证显示,设计的数字化相敏解调完全满足ECT系统对精度和速度的要求。