JLab韧致辐射标记系统的能量标定
Energy Calibration of the JLab Bremsstrahlung Tagging System
摘要：
在这份报告中，我们提出的能量校准厅B韧致辐射标记系统在托马斯杰斐逊国家加速器设施。使用磁对光谱仪进行校准。标记的光子能谱与作为对光谱仪磁场的函数的$e^+e^-$对一致地测量。利用对谱仪的内线性，在$\pm 0.1% E_γ$水平上校准标记系统的能量。使用接近光子谱终点的$e^+e^-$速率测量确定绝对能量标度。发现整个标记范围内的能量变化为$<3$ MeV。
英文摘要：
In this report, we present the energy calibration of the Hall B bremsstrahlung tagging system at the Thomas Jefferson National Accelerator Facility. The calibration was performed using a magnetic pair spectrometer. The tagged photon energy spectrum was measured in coincidence with $e^+e^-$ pairs as a function of the pair spectrometer magnetic field. Taking advantage of the internal linearity of the pair spectrometer, the energy of the tagging system was calibrated at the level of $\pm 0.1% E_γ$. The absolute energy scale was determined using the $e^+e^-$ rate measurements close to the end-point of the photon spectrum. The energy variations across the full tagging range were found to be $<3$ MeV.
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