单粒子效应(SEE)加速器地面模拟需要离子束具有较好的均匀度，针对回旋加速器单粒子效应模拟的束流特点，建立了一套以位置灵敏平行板雪崩探测器(Parallel Plate Avalanche Counter， PPAC)为基础的均匀度探测系统并完成了带束测试，对它的结构、工作原理、均匀度获得方法及带束测试结果进行描述。为验证PPAC测量结果准确性，在带束测试过程中，前方同时放置PET膜测量穿过PPAC探测器的粒子分布，与离子径迹测量结果对比，给出PPAC的均匀度的测量误差在5%之内。探测器具有50 mm×50 mm的灵敏面积和小于1 mm的位置分辨，符合单粒子效应实验对束流均匀度测量的要求。
The homogeneity of beam is an important physical parameter in the ground-test accelerator of single event effects (SEEs), it can affect the SEEs evaluation accuracy. Nuclear track detector cannot get the beam profile promptly. A uniformity measurement system based on the Position sensitive parallel plate avalanche detector (PPAC) was built to fulfil the homogeneity analysis in real time during the SEE test. Here its construction and principle, the method of analysis and the result of beam test are described. To validate the result of PPAC, a PET film was synchronously irradiated before the PPAC. In comparison with the obtained results of PET films observation, the uniformity value from the PPAC has an estimated maximum error of 5%. The PPAC has about 1 mm position resolution and 50 mm × 50 mm sensitive area. Which can satisfy the requirement of uniformity analysis on SEEs test by accelerator irradiation.
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