闪烁体薄膜在线测量质子束流强度

In-site measurement of intensity of proton beam using film scintillator

质子单粒子效应实验研究和质子加速器研究中,质子束流强测量关系着实验结果的可靠性和准确性。法拉第筒、金硅面垒探测器、金刚石探测器等传统探测方法均为拦截式测量,无法实现束流的在线测量。本文用闪烁体薄膜在线监测质子束流强。质子束流穿过薄膜闪烁体,沉积部分能量使其发光,用光电倍增管收集光信号,从而得到束流的强度信息。通过质子与闪烁体材料相互作用的理论计算得到闪烁体材料对质子束流的响应关系。在北大2×6 MeV串列加速器上对3–10 MeV的质子束流进行了实验测量,验证了其响应关系。

In proton single-event-effects experiments, and proton accelerators for advanced researches, precise measurement of proton beam current is important for reliability and accuracy of the experiments. Traditional detection methods, such as Faraday cup, Si（Au） surface barrier detector, and diamond detector, are of beam-block type measurements, where changes in proton beam current can hardly be monitored in-site. In this paper, film scintillators are used to detect the proton beam. Protons travel through the film scintillator, deposit part of the energy and make the scintillator emit lights, which are collected by a photomultiplier tube. Rresponse of the film scintillator to protons are calculated and verified by experiments with proton beams at 3-10 MeV from the 2 × 6 MeV tandem accelerator at Peking University.