ALMA Band 6v2 receiver development status

We report on the design of the ALMA “Band 6v2” Superconductor-Insulator-Superconductor (SIS) receiver, an upgraded version of the existing 211-275 GHz ALMA Band 6v1 receiver. The Band 6v2 receiver complies with the strategies defined in the ALMA Development Roadmap to 2030. Our goal is to deliver an improved production-level receiver based on (i) a new Cold Cartridge Assembly (CCA) with increased sensitivity over an expanded 4-16 GHz IF (Intermediate Frequency) band (420 GHz goal) and a modestly expanded 209-281 GHz RF (Radio Frequency) band, and (ii) a new low-noise local oscillator (the Warm Cartridge Assembly or WCA). The new Band 6v2 receiver will be backward-compatible with the current Band 6 receiver and will be able to be installed in the ALMA Front-End cryostat as a replacement for the existing units.