用于地面gamma-ray天文学的Schwarzschild-Couder双镜望远镜
Schwarzschild-Couder two-mirror telescope for ground-based gamma-ray astronomy
摘要:
具有两个非球面镜的Schwarzschild型消球差望远镜,用于校正球面像差和彗差,被认为是利用地基大气切伦科夫技术在伽马射线天文学中的应用。我们使用的主要和次要的反射镜的图形的解析描述,并通过数值光线追迹,我们发现望远镜的配置,最大限度地减少散光和最大限度地提高有效的光收集面积。结果表明,与传统的主焦点戴维斯-科顿设计,这样的望远镜提供了一个解决方案,宽视场的伽玛射线观测。这些设计是等距的,可以优化为在整个领域没有渐晕,并允许显着减少板规模,使它们与精细像素化的相机兼容,这些相机可以由现代的,具有成本效益的图像传感器,如多阳极光电倍增管,SiPM或图像增强器构成。
英文摘要:
Schwarzschild-type aplanatic telescopes with two aspheric mirrors, configured to correct spherical and coma aberrations, are considered for application in gamma-ray astronomy utilizing the ground-based atmospheric Cherenkov technique. We use analytical descriptions for the figures of primary and secondary mirrors and, by means of numerical ray-tracing, we find telescope configurations which minimize astigmatism and maximize effective light collecting area. It is shown that unlike the traditional prime-focus Davies-Cotton design, such telescopes provide a solution for wide field of view gamma-ray observations. The designs are isochronous, can be optimized to have no vignetting across the field, and allow for significant reduction of the plate scale, making them compatible with finely-pixilated cameras, which can be constructed from modern, cost-effective image sensors such as multi-anode PMTs, SiPMs, or image intensifiers.
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