Development of Superconducting Devices Supporting Radio Astronomy

Yoshinori UZAWA  Matthias KROUG  Takafumi KOJIMA  Masanori TAKEDA  Kazumasa MAKISE  Shohei EZAKI  Wenlei SHAN  Akihira MIYACHI  Yasunori FUJII  Hirotaka TERAI  

IEICE TRANSACTIONS on Electronics   Vol.E104-C   No.9   pp.411-421
Publication Date: 2021/09/01
Publicized: 2021/03/24
Online ISSN: 1745-1353
DOI: 10.1587/transele.2020SUI0003
Type of Manuscript: INVITED PAPER (Special Section on Fabrication of Superconductor Devices; Key Technology in Superconductor Electronics)
radio astronomy,  SIS mixers,  ALMA Band 10,  wideband,  multibeam,  

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This paper describes the development of superconductor-insulator-superconductor (SIS) mixers for the Atacama Large Millimeter/submillimeter Array (ALMA) from the device point of view. During the construction phase of ALMA, the National Astronomical Observatory of Japan (NAOJ) successfully fabricated SIS mixers to meet the stringent ALMA noise temperature requirements of less than 230 K (5 times the quantum noise) for Band 10 (787-950 GHz) in collaboration with the National Institute of Information and Communications Technology. Band 10 covers the highest frequency band of ALMA and is recognized as the most difficult band in terms of superconducting technology. After the construction, the NAOJ began development studies for ALMA enhancement such as wideband and multibeam SIS mixers according to top-level science requirements, which are also presented.