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Superconducting Receiver Technologies Supporting ALMA and Future Prospects
Radio Science ( IF 1.6 ) Pub Date : 2021-04-18 , DOI: 10.1029/2020rs007157
Y. Uzawa 1, 2 , Y. Fujii 1 , T. Kojima 1, 2 , M. Kroug 3, 4 , W. Shan 1, 2 , S. Ezaki 1 , A. Miyachi 1 , H. Kiuchi 3 , A. Gonzalez 2, 3
Affiliation  

This paper describes the development of superconductor–insulator–superconductor (SIS) receivers in the 787–950 GHz radio frequency (RF) range, which covers the highest frequency band of the Atacama Large Millimeter/submillimeter Array (ALMA) and is recognized as the most difficult band in terms of superconducting technology, because the conventional superconducting material of Nb cannot be used for the circuitry in the mixer devices at the frequencies. The development began at the National Astronomical Observatory of Japan (NAOJ) in 2005, and the manufacturing and testing of all the receivers to be installed in the 66 Cassegrain reflector antennas that compose ALMA was completed in 2013. This enabled the terahertz frequency observations with the highest sensitivity from the ground. To meet the stringent ALMA requirements, terahertz SIS mixers with high‐quality superconducting NbTiN films were developed, which successfully demonstrated an unpreceded noise performance less than 230 K (5 times the quantum noise) for all the receivers. After the construction of ALMA, NAOJ began development studies for ALMA enhancement such as wideband and multibeam SIS receivers according to top‐level science requirements. To increase instantaneous bandwidth of the receivers, a submillimeter‐wave multiband receiver concept with a waveguide multiplexer, wideband intermediate frequency SIS‐mixer‐amplifier, and multifrequency local oscillator (LO) source is presented. The multibeam receiver employs a planar‐integrated SIS mixer circuit that includes all the RF components except the LO distribution network and an SIS‐mixer‐based amplifier of low power consumption, which is expected to enable the wide field‐of‐view observations in the future.

中文翻译:

支持ALMA的超导接收器技术和未来前景

本文介绍了在787-950 GHz射频(RF)范围内的超导体-绝缘体-超导体(SIS)接收机的发展,该接收机覆盖了阿塔卡马大毫米/亚毫米阵列(ALMA)的最高频带,被认为是就超导技术而言,这是最困难的频段,因为常规的Nb超导材料无法在该频率下用于混频器设备中的电路。该开发工作于2005年在日本国家天文台(NAOJ)进行,并于2013年完成了将要安装在组成ALMA的66枚Cassegrain反射天线中的所有接收机的制造和测试。地面灵敏度最高。为了满足ALMA的严格要求,开发了具有高质量超导NbTiN薄膜的太赫兹SIS混频器,该混频器成功地证明了所有接收器的噪声性能均低于230 K(量子噪声的5倍)。在建立ALMA之后,NAOJ根据顶级科学要求开始了针对ALMA增强的开发研究,例如宽带和多波束SIS接收机。为了增加接收器的瞬时带宽,提出了具有波导复用器,宽带中频SIS混合器放大器和多频本地振荡器(LO)源的亚毫米波多频带接收器概念。多波束接收器采用平面集成的SIS混频器电路,该电路包括除LO分配网络和低功耗,基于SIS混频器的放大器之外的所有RF组件,
更新日期:2021-05-07
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