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arXiv 2209.02680astro-ph.IM
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原型Schwarzschild-Couder望远镜的设计和升级

Design and upgrade of the prototype Schwarzschild-Couder Telescope

Leslie Taylor

摘要:

切伦科夫望远镜阵列(Cherenkov Telescope Array,CTA)是下一代甚高能伽马射线天文学的地面观测站。CTA将具有无与伦比的灵敏度和角分辨率,探测伽马射线源的速度将比目前的阵列快近100倍,从而实现宝贵的多波长和多信使观测。Schwarzschild-Couder望远镜(SCT)是CTA中中型望远镜的候选者。在美国亚利桑那州的弗雷德·劳伦斯·惠普尔天文台建造了一个原型SCT(pSCT)。它的相机目前部分配备了1600像素(2.7度FOV)。小的光学系统板规模允许密集包装的硅光电倍增器被使用,它与高密度触发和波形读出电子相结合,使高分辨率相机。相机的电子设备能够以纳秒分辨率的波形读出来成像空气簇射的发展。pSCT于2019年1月启用,并在全年持续调试。pSCT的第一次观察活动于2020年1月和2月进行。蟹状星云的伽马射线辐射被探测到,其显著性为8.6 sigma。目前正在对pSCT相机进行升级。此次升级将完全填充焦平面,将视场直径增加到8度,并降低前端电子噪声,从而降低触发阈值,改善重建和背景抑制。

英文摘要:

The Cherenkov Telescope Array (CTA) is the next-generation ground-based observatory for very-high energy gamma-ray astronomy. CTA will have unparalleled sensitivity and angular resolution and will detect gamma-ray sources nearly 100 times faster than current arrays, enabling valuable multiwavelength and multimessenger observations. The Schwarzschild-Couder Telescope (SCT) is a candidate for the Medium-Sized telescope in CTA. A prototype SCT (pSCT) has been constructed at the Fred Lawrence Whipple Observatory in Arizona USA. Its camera is currently partially instrumented with 1600 pixels (2.7 degree FOV). The small plate scale of the optical system allows densely packed silicon photomultipliers to be used, which combined with high-density trigger and waveform readout electronics enable the high-resolution camera. The camera's electronics are capable of imaging air shower development with waveform readout with nanosecond resolution. The pSCT was inaugurated in January 2019, with commissioning continuing throughout that year. The first campaign of observations with the pSCT was conducted in January and February of 2020. Gamma-ray emission from the Crab Nebula was detected with a significance of 8.6 sigma. An upgrade to the pSCT camera is currently underway. The upgrade will fully populate the focal plane, increasing the field of view to 8 degrees diameter, and lower the front-end electronics noise, enabling a lower trigger threshold and improved reconstruction and background rejection.

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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