Suggested quasi-Cassegrain system for multi-beam observation of FAST

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	Suggested quasi-Cassegrain system for multi-beam observation of FAST
	Su DQ(苏定强); Bai H(白华); Cui XQ(崔向群)
	2020-01
发表期刊	Research in Astronomy and Astrophysics
卷号	20 期号:1 页码:3-7
摘要	FAST, the largest single-dish radio telescope in the world, has a 500-meter diametermain reflector and a 300-meter diameter illuminated area. It has amain reflector that can vary its shape, which continuously changes the shape of the illuminated area in reflector into a paraboloid. In this article, we propose a quasi-Cassegrain system for FAST. The detailed design results are provided. Such a quasi-Cassegrain system only needs to add a 14.6-meter diameter secondary reflector, which is close to the size of the feed cabin. The distance from the secondary reflector to the focus is only 5.08m, and it has excellent image quality. In this quasi-Cassegrain system, the shape of the illuminated area in the main reflector continuously changes into an optimized hyperboloid. Using this quasi-Cassegrain system from frequency 0.5GHz to 8GHz, the multi-beam system can include 7 to 217 feeds. If this system is used in combination with Phased Array Feed (PAF) technology, more multi-beam feeds or a higher working frequency can be used.
学科领域	天文技术与方法
语种	英语
文献类型	期刊论文
条目标识符	http://ir.niaot.ac.cn/handle/114a32/1783
专题	期刊论文
作者单位	南京天文光学技术研究所
推荐引用方式 GB/T 7714	Su DQ,Bai H,Cui XQ. Suggested quasi-Cassegrain system for multi-beam observation of FAST[J]. Research in Astronomy and Astrophysics,2020,20(1):3-7.
APA	Su DQ,Bai H,&Cui XQ.(2020).Suggested quasi-Cassegrain system for multi-beam observation of FAST.Research in Astronomy and Astrophysics,20(1),3-7.
MLA	Su DQ,et al."Suggested quasi-Cassegrain system for multi-beam observation of FAST".Research in Astronomy and Astrophysics 20.1(2020):3-7.

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