A Submillimeter Cartridge-Type Receiver: ALMA Band 8 (385--500 GHz) Qualification Model

• Published in: Publications of the Astronomical Society of Japan 2008-10, Vol.60 (5), p.1199-1207
• Main Authors: Satou, Naohisa, Sekimoto, Yutaro, Iizuka, Yoshizou, Ito, Tetsuya, Shan, Wen-Lei, Kamba, Toshiaki, Kumagai, Kazuyoshi, Kamikura, Mamoru, Tomimura, Yu, Serizawa, Yasutaka, Asayama, Shin'ichiro, Sugimoto, Masahiro
• Format: Article
• Language: English
• ISSN: 0004-6264; 2053-051X
• DOI: 10.1093/pasj/60.5.1199

We have developed a cartridge-type receiver covering the frequency band of 385-500 GHz as a qualification model of Atacama Large Millimeter/submillimeter Array (ALMA) band 8. It receives two orthogonal polarizations and down-converts the sideband-separated signals to intermediate frequencies (IF) of between 4 and 8 GHz. The cartridge-type receiver consists of cold optics, two feed horns, a wire grid, mirrors, two sideband-separating SIS mixers, cryogenic multipliers of a local oscillator (LO), cryogenic and warm IF amplifiers, a cartridge body, and sensors/wirings. These components were individually tested, and then the cartridge was integrated and tested as a complete assembly. We have also developed equipment for efficiency tests of both the components and the integrated receiver. The single sideband (SSB) noise temperature of this receiver is 100 K at the band center and 300 K at the band edges. The beam pattern and cross-polarization pattern are consistent with a physical optical calculation. The amplitude stability is around $3 \times 10^{-4}$ in 1 s. The phase stability is less than 2.0D on a time scale of 0.1 s to 10 min. These results are promising for a receiver in the ALMA.