| The Influence of Panel Gaps on the System NoiseTemperature of the FAST |
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| 作者姓名： | YanSu Guo－DingLi |
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| 作者单位： | 1 Beijing Astronomical Observatory，National Astronomical Observatories，Chinese Academy of Sciences，Beijing 100012 2 The Laboratory of Microwave and Digital Communication Technology，Tsinghua University，Beijing 100084 |
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| 摘 要： | 1 INTRODUCTIONThe FAST is an ArecibChtype telescope with a number of innovations, which is to be built inthe unique karst area of Southwest China (Nan Rendong et al. 1996). Some basic parametersof the FAST have been tentatively suggested such as, curvature radius R = 300m, openingangle 0 = 120', and frequency range from 300MHz to 5 GHz. Baized on the fact that thecelltral part of a spherical surface deyiates little from a paraboloid as a proper focal length ischosen, a novel design…
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| 关 键 词： | FAST 望远镜 能量泄漏 抛物面 球面 |
The Influence of Panel Gaps on the System Noise Temperature of the FAST |
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| Yan Su and Guo-Ding Li.The Influence of Panel Gaps on the System NoiseTemperature of the FAST[J].Chinese Journal of Astronomy and Astrophysics,2001,1(2):190-194. |
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| Authors: | Yan Su and Guo-Ding Li |
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| Institution: | BeijingAstronomicalObservatory,NationalAstronomicalObservatories,ChineseAcademyofSciences,Beijing1000 |
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| Abstract: | A Five-hundred-meter Aperture Spherical Telescope(FAST),the largest single dish in the world,is proposed to be built in one of the karst depressions in Guizhou province.The main spherical reflector is to consist of about two thousand small panels,which can be adjusted to fit a paraboloid in real time.There are many slit-like gaps across the aperture due to manufacturing error,thermal effects and deviations between a sphere and a paraboloid.The influence of the energy leakage of the narrow gaps on the system noise temperature of the FAST reflector is discussed in this paper. |
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| Keywords: | telescopes - methods: analytical - energy leakage |
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