Design and Performance of the 600-720 GHz ALMA Band 9 Cartridge

Abstract

The ALMA Band 9 cartridge is a compact receiver unit for the Atacama Large Millimeter Array (ALMA) containing the core of a 600-720 GHz heterodyne front end, including a solid-state local oscillator; broadband SIS mixers; and a 4-12 GHz IF amplifier chain. This paper describes the design and performance of the first Band 9 cartridge. The experience gained with this unit is being used to optimize the design in preparation for the production of sufficient cartridges to fully populate the ALMA and ALMA Compact Arrays (ultimately requiring roughly 80 cartridges).

Cryogenic testing and multi-chip module design of a 31.3-45GHz MHEMT MMIC-based heterodyne receiver for radio astronomy

“…The receiver front-end system divided into 10 bands to cover the atmospheric windows with frequency range from 31.3 to 950GHz. The development of band 3, 4, 6, 7, 8, 9 are [11][12][13][14][15][16]. However, it is believed that the ALM Band-1 which cover31.3-45GHz frequency range will be capable to solve the important scientific problems listed above.…”