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ALMA Front-end Optics

机译:ALMA前端光学

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摘要

The ALMA telescope will be an interferometer of 64 antennas, which will be situated in the Atacama desert in Chile. Each antenna will have receivers that cover the frequencies 30 GHz to 970 GHZ. This frequency range is divided into 10 frequency bands. All of these receiver bands are fitted on a cartridge and cooled, with bands 1 and 2 at 15K and the other 8 are SIS receivers at a temperature of 4K. Each band has a dual polarization receiver. The optics has been designed so that the maximum of the optics is cooled to minimize the noise temperature increase to the receivers. The design of the optics will be shown for each frequency bands. Test results with the method of testing on a near field amplitude and phase measurement system will be given for the first 4 frequency bands to be used, which are bands 3 (84-116 GHz), 6 (211-275GHz), 7 (275-375 GHz and 9 (600-702 GHz). These measurements will be compared with physical optics calculations.
机译:ALMA望远镜将是64根天线的干涉仪,将位于智利的阿塔卡马沙漠。每个天线将具有覆盖30 GHz至970 GHZ频率的接收器。该频率范围分为10个频段。所有这些接收器频段都安装在盒式磁带上并进行了冷却,频段1和2在15K下,而其他8个是在4K温度下的SIS接收机。每个频段都有一个双极化接收器。光学器件经过精心设计,可以最大程度地冷却光学器件,以最大程度降低接收器的噪声温度升高。将针对每个频段显示光学器件的设计。对于要使用的前四个频段,将给出在近场振幅和相位测量系统上进行测试的测试结果,分别是频段3(84-116 GHz),6(211-275GHz),7(275) -375 GHz和9(600-702 GHz):这些测量值将与物理光学计算进行比较。

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