Updates on ALMA Band 6v2 Receiver Development

We are developing an upgrade for the existing 211-275 GHz ALMA Band 6 receiver, referred to as Band 6v2. The new Band 6v2 receiver, based on a sideband separating SIS mixer architecture, will have a greatly increased IF bandwidth (baseline IF 4-16 GHz, goal IF 4-20 GHz) and a modestly expanded RF band (209-281 GHz) compared to the current Band 6. The Band 6v2 receiver consists of a new Cold Cartridge Assembly and a new Warm Cartridge Assembly designed to meet several challenging specifications that comply with the ALMA Wideband Sensitivity Upgrade requirements, including low noise (TSSB less than 53 K over 80\% of the band), high image rejection (greater than 15 dB over 90\% of the IF range), relatively flat receiver noise and gain vs frequency, as well as improved OMT and optics for lower sidelobe and cross-polarization levels. We are exploring several different configurations for the ALMA Band 6v2 sideband separating receiver, with improvements to all the major components, including optics, OMT, mixers, IF section, and local oscillator. The presentation will provide a brief overview of all the aforementioned aspects of the project.