在MAMI和GSI进行的反射式光纤探测器的束内试验
In-beam tests of scintillating fibre detectors at MAMI and at GSI
摘要：
在美因茨微加速器MAMI的光谱仪设施上，以及在GSI的2 AGeV能量的C-12束流和不同粒子种类的束流中，用电子研究了闪烁光纤探测器的性能。使用多阳极光电倍增管读出一束或多束128根纤维，每束纤维具有不同的几何形状。对于电子，在单个探测器平面中测量到FWHM = 1 ns的时间分辨率，探测效率> 99%。对于碳离子，在两个纤维平面之间实现了310 ps（FWHM）的时间分辨率，导致单个检测器的FWHM = 220 ps。在FWHM = 0.27 mm的宽度下测量命中位置残余。对于碳离子，测量的能量沉积的变化为Δ E/E= 15-20%（FWHM）。此外，还研究了对p/pi/d粒子的能量响应。根据探测器的良好性能，将为MAMI的KAOS/A1光谱仪和GSI的HypHI实验制造纤维矢端镜。
英文摘要：
The performance of scintillating fibre detectors was studied with electrons at the spectrometer facility of the Mainz microtron MAMI, as well as in a C-12 beam of 2 AGeV energy and in a beam of different particle species at GSI. Multi-anode photomultipliers were used to read out one or more bundles of 128 fibres each in different geometries. For electrons a time resolution of FWHM = 1 ns was measured in a single detector plane with a detection efficiency epsilon > 99%. A time resolution of 310 ps (FWHM) between two planes of fibres was achieved for carbon ions, leading to a FWHM = 220 ps for a single detector. The hit position residual was measured with a width of FWHM = 0.27 mm. The variation in the measured energy deposition was Delta E/E= 15-20% (FWHM) for carbon ions. In addition, the energy response to p/pi/d particles was studied. Based on the good detector performance fibre hodoscopes will be constructed for the KAOS/A1 spectrometer at MAMI and for the HypHI experiment at GSI.
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