Two types of wedge-shaped CsI(Tl) crystals were designed to be placed behind an annular double-sided silicon detector to identify light charged-particles with the $\Delta E-E$ method. The properties of the CsI(Tl) detectors with different shapes and sizes were investigated using an $\alpha$ source and a radioactive beam of ¹⁵C. The larger crystal was found to have better energy resolution, smaller light output non-uniformity, as well as better particle identification capability, and was finally adopted to form the $\Delta E$-$E$ telescope. The performance of the two types of CsI(Tl) crystals are interpreted based on Geant4 simulation results.

中文翻译：

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带电粒子望远镜楔形CsI(Tl)晶体的特性研究

两种类型的楔形 CsI(Tl) 晶体被设计为放置在环形双面硅探测器后面，以识别带有 $\Delta 乙-乙$方法。使用不同形状和尺寸的 CsI(Tl) 探测器的特性进行了研究。$\alpha$源和¹⁵ C 的放射性束。 发现更大的晶体具有更好的能量分辨率，更小的光输出不均匀性，以及更好的粒子识别能力，最终被采用形成$\Delta 乙$——$乙$望远镜。基于 Geant4 模拟结果解释了两种类型的 CsI(Tl) 晶体的性能。