用于AEgIS反氢探测的低温跟踪探测器
A cryogenic tracking detector for antihydrogen detection in the AEgIS experiment
摘要：
我们提出了快速湮灭低温跟踪器探测器（FACT）的调试，安装在AEgIS实验的1 T超导磁体内的反氢产生陷阱周围。FACT的目的是探测反质子湮灭产生的π介子。它的794个放大光纤工作在4 K，并在接近室温的条件下由硅光电倍增器（MPPC）读出。FACT提供了几纳秒时间分辨率的反质子/反氢湮灭位置信息。我们提出的硬件和软件的发展，导致成功的操作的探测器的反氢检测和反质子损失的效率评估的结果。反氢信号的主要背景是正电子撞击到正电子素转换靶上并产生大量伽马射线，这些伽马射线在MPPC中产生相当大的信号，就在预期的反氢信号之前不久。我们详细描述了这种背景信号的特性及其对反氢探测效率的影响。
英文摘要：
We present the commissioning of the Fast Annihilation Cryogenic Tracker detector (FACT), installed around the antihydrogen production trap inside the 1 T superconducting magnet of the AEgIS experiment. FACT is designed to detect pions originating from the annihilation of antiprotons. Its 794 scintillating fibers operate at 4 K and are read out by silicon photomultipliers (MPPCs) at near room temperature. FACT provides the antiproton/antihydrogen annihilation position information with a few ns timing resolution. We present the hardware and software developments which led to the successful operation of the detector for antihydrogen detection and the results of an antiproton-loss based efficiency assessment. The main background to the antihydrogen signal is that of the positrons impinging onto the positronium conversion target and creating a large amount of gamma rays which produce a sizeable signal in the MPPCs shortly before the antihydrogen signal is expected. We detail the characterization of this background signal and its impact on the antihydrogen detection efficiency.
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