A compact broadband Compton spectrometer with high spectral resolution has been designed to detect spectra of laser-driven high-flux gamma rays. The primary detection range of the gamma-ray spectrum is 0.5 MeV–13 MeV, although a secondary harder gamma-ray region of 13 MeV–30 MeV can also be covered. The Compton-scattered electrons are spectrally resolved using a curved surface detector and a nonuniform magnetic field produced by a pair of step-like magnets. This design allows a compact structure, a wider bandwidth, especially in the lower-energy region of 0.5 MeV–2 MeV, and optimum spectral resolution. The spectral resolution is 5%–10% in the range 4 MeV–13 MeV and better than 25% in the range 0.5 MeV–4 MeV (with an Al converter of 0.25 mm thickness and a collimator of 1 cm inner diameter). Low-Z plastic materials are used on the inner surface of the spectrometer to suppress noise due to secondary X-ray fluorescence. The spectrometer can be adjusted flexibly via a specially designed mechanical component. An algorithm based on a regularization method has also been developed to reconstruct the gamma-ray spectrum from the scattered electrons.

中文翻译：

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用于激光驱动高通量伽马射线的紧凑型宽带高分辨率康普顿光谱

具有高光谱分辨率的紧凑型宽带康普顿光谱仪已设计用于检测激光驱动的高通量伽马射线的光谱。伽马射线光谱的主要探测范围是 0.5 MeV–13 MeV，但也可以覆盖 13 MeV–30 MeV 的二级更硬的伽马射线区域。康普顿散射电子使用曲面检测器和由一对阶梯状磁铁产生的非均匀磁场进行光谱解析。这种设计允许紧凑的结构、更宽的带宽，尤其是在 0.5 MeV–2 MeV 的低能量区域，以及最佳的光谱分辨率。光谱分辨率在 4 MeV–13 MeV 范围内为 5%–10%，在 0.5 MeV–4 MeV 范围内优于 25%（使用厚度为 0.25 mm 的 Al 转换器和内径为 1 cm 的准直器）。光谱仪的内表面使用低 Z 塑料材料，以抑制二次 X 射线荧光引起的噪声。光谱仪可以通过专门设计的机械部件灵活调整。还开发了一种基于正则化方法的算法，以从散射电子重建伽马射线谱。