光学渡越辐射测量中能量分辨精度分析

 基于光学渡越辐射原理的用于高能强流电子束束流参数在线测量及诊断系统，具有时间响应快、分辨率高等特点，可以测量电子束的束剖面、发散角、能量等多个参数。分析了测量系统的结构参数（包括了透镜的焦距、成像面位置、CCD像元尺寸）对电子束能量测量精度的影响，并在理论上模拟了电子束的发散角的影响。还根据系统数据的特点，阐述了数据噪声对能量测量结果精度的影响，指出了光学渡越辐射测量中电子束能量分辨精度受到多种因素的影响，需要在数据处理时考虑修正。

Energy resolution for measurement method using optical transition radiation

The technology using optical transition radiation(OTR) is a measurement method for the electron beam of high energy and high current and it has been applied in the on-line beam diagnostic system with ultra-fast response, high special resolution. It measures the beam parameters such as beam energy, divergence and emmittance. The effect of structure parameters of the measurement system, such as the focus length of the lens, the location of image, the pixel size of CCD, upon the measurement accuracy of the beam energy resolution was analyzed. The influence of beam divergence angle on energy resolution in OTR measurement was simulated. The effect was applied to correct the measuring data of beam energy resolution. The effect of OTR data noise on the precision of beam energy resolution was also expatiated according to the data noise trait. The precision of beam energy resolution is about 100 keV even in a reasonable designed measurement system when the beam energy is 20 MeV.