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arXiv 1508.06752astro-ph.IM
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切伦科夫望远镜阵大口径望远镜相机标定原型装置的设计

Design of a prototype device to calibrate the Large Size Telescope camera of the Cherenkov Telescope Array

M. Iori, P. Majumdar, F. De Persio, A. Chatterjee, F. Ferrarotto, B. K. Nagesh, L. Saha, B. B. Singh

摘要:

切伦科夫望远镜阵列是一个旨在探索电磁波谱最高能量区域的项目。两个阵列,每个半球一个,将覆盖从几十个GeV到几百个TeV的范围内的整个天空,提高灵敏度和角分辨率目前的操作阵列。2016年将在加那利群岛的拉帕尔马安装一个用于研究几十GeV以上伽马射线天文学的大型望远镜原型。LST相机由光电倍增管(PMT)阵列制成,需要在宽动态范围内进行精确和系统的校准。在这方面的贡献,我们提出了一个光学校准系统,由355 nm波长的激光器与400 ps的脉冲宽度,1 μ J的输出能量,高达4k Hz的重复率和一组中性密度过滤器,以获得广泛的光子强度,高达1000光电子/PMT,被发送到相机平面28米远。位于反射平面中心的校准盒漫射器后的光子数由光电二极管监测。激光器的稳定性和校准盒内的环境参数由多任务处理器检查,并将触发信号发送到相机数据采集系统。箱形框架的设计特别注意获得具有稳定光学和机械特性的坚固设备。

英文摘要:

The Cherenkov Telescope Array is a project that aims to exploring the highest energy region of electromagnetic spectrum. Two arrays, one for each hemisphere, will cover the full sky in a range from few tens of GeV to hundreds of TeV improving the sensitivity and angular resolution of the present operating arrays. A prototype of the Large Size Telescope (LST) for the study of gamma ray astronomy above some tens of GeV will be installed at the Canary Island of La Palma in 2016. The LST camera, made by an array of photomultipliers (PMTs), requires an accurate and systematic calibration over a wide dynamic range. In this contribution, we present an optical calibration system made by a 355 nm wavelength laser with 400 ps pulse width, 1 muJ output energy, up to 4k Hz repetition rate and a set of neutral density filters to obtain a wide range of photon intensities, up to 1000 photoelectrons/PMT, to be sent to the camera plane 28 m away. The number of photons after the diffuser of the calibration box, located in the center of the reflective plane, is monitored by a photodiode. The stability of the laser and the ambient parameters inside this calibration box are checked by a multi-task processor and a trigger signal is sent to the camera data acquisition system. The box frame is designed with special attention to obtain a robust device with stable optical and mechanical features.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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