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15K前置放大器由闭循环制冷机系统来冷却。极化器也被冷却到最低噪声,对应于来自馈电器相反回路极化的信号,极化器也输出信号。对于4.8GHz及更高波段,极化器将被冷却到15K,即制冷机的第二级制冷温度。对于1.5及2.3GHz波段,因为极化器较大,装在制冷机第二级上太重,所以来只把它冷却到60K,即制冷机的第一级制冷温度。对于2.3GHz及较高波段,采用CTI22型制冷机每冷却。对于1.5GHz,采用较大的CTI350型制冷机来冷却。下表给出了这些制冷机的详细说明。或个天线装有二台1020型压缩机(其中一台作备份)。每台1020型压缩机可以驱动五台22型制冷机,
The 15K preamplifier is cooled by a closed loop chiller system. The polarizer is also cooled to the lowest noise, corresponding to the signal from the opposite loop of the feeder, which also outputs the signal. For the 4.8GHz band and beyond, the polarizer will be cooled down to 15K, the second stage cooling temperature of the refrigerator. For the 1.5 and 2.3GHz bands, the polarizer is too large to be too heavy on the second stage of the refrigerator, so it is only cooled to 60K, the first stage of the refrigerator. For the 2.3GHz and higher band, the CTI22 type cooler is used for each cooling. For 1.5GHz, the larger CTI 350 is used for cooling. The following table shows the details of these refrigerators. Or two antennas equipped with two 1020 compressors (one for backup). Each 1020 compressor can drive five 22-type refrigerator,