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arXiv 1709.00239astro-ph.IMphysics.ins-det
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光阱:用于甚高能天文学及更远领域的SiPM升级

Light-Trap: A SiPM Upgrade for Very High Energy Astronomy and Beyond

D. Guberman, J. Cortina, J. E. Ward, A. Hahn, D. Mazin, J. Boix, A. Dettlaff, D. Fink, J. Gaweda, W. Haberer, J. Illa, J. Mundet, Y. Vera, H. Wetteskind

摘要:

随着大气切伦科夫成像技术(IACT)的发展,γ射线天文学已成为天体物理学中最有趣和最富有成果的领域之一。目前的IACT望远镜阵列(MAGIC、H.E.S.S、VERITAS)使用光电倍增管探测伽马射线与大气相互作用产生的光学/近紫外切伦科夫辐射。对于下一代IACT实验,正在研究用硅光电倍增器(SiPMs)取代PMT的可能性。SiPM的主要缺点是其有限的有效面积(导致相机读出的成本和复杂性增加)以及其对不想要的波长的敏感性。在这里,我们提出了一种新的方法来建立一个相对低成本的像素组成的SiPM附加到PMMA光盘掺杂的波长移位器。该像素比单个标准SiPM收集更大面积的光,并提高了对近紫外光的灵敏度,同时拒绝背景。我们描述的检测器的设计,也可以在其他领域的检测面积和成本是至关重要的应用程序。我们目前的模拟和实验室测量的像素原型和现场测试的结果与7像素集群安装在一个魔术望远镜相机。

英文摘要:

With the development of the Imaging Atmospheric Cherenkov Technique (IACT), Gamma-ray astronomy has become one of the most interesting and productive fields of astrophysics. Current IACT telescope arrays (MAGIC, H.E.S.S, VERITAS) use photomultiplier tubes (PMTs) to detect the optical/near-UV Cherenkov radiation emitted due to the interaction of gamma rays with the atmosphere. For the next generation of IACT experiments, the possibility of replacing the PMTs with Silicon photomultipliers (SiPMs) is being studied. Among the main drawbacks of SiPMs are their limited active area (leading to an increase in the cost and complexity of the camera readout) and their sensitivity to unwanted wavelengths. Here we propose a novel method to build a relatively low-cost pixel consisting of a SiPM attached to a PMMA disc doped with a wavelength shifter. This pixel collects light over a much larger area than a single standard SiPM and improves sensitivity to near-UV light while simultaneously rejecting background. We describe the design of a detector that could also have applications in other fields where detection area and cost are crucial. We present results of simulations and laboratory measurements of a pixel prototype and from field tests performed with a 7-pixel cluster installed in a MAGIC telescope camera.

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