KEYWORDS: Receivers, Optical amplifiers, Radio astronomy, Antennas, Astronomy, Observatories, Cryogenics, Simulation of CCA and DLA aggregates, Roads, Galactic astronomy
The Atacama large millimeter/submillimeter array (ALMA) band-1 receiver covers the frequency band between 35-50 GHz. An extension of up to 52 GHz is on a best-effort basis. Covering the longest wavelengths visible with ALMA, this receiver is enabling studies of dust grain evolution in proto-planetary systems probing dust grain sizes close to 1 cm, and with multiple red-shifted molecular lines it will open up a new window in the high-redshift universe. The band-1 project has recently achieved first light and with this passed a major project milestone. We present the challenges, from initial development to prototype, to establishing the infrastructure, integration, and evaluation of 73 production receiver units, and to the final tasks to complete the project. We conclude with the initial performance and characterization of the first band-1 receivers installed on ALMA.
The ALMA 2030 Development Roadmap defines the long-term scientific objectives and serves as a guide for the development activity for the upgrade of hardware, software, and analysis tools in order to enhance the future observing capabilities of ALMA. A working group was established to define a set of consistent system level technical goals in order to guide the ongoing and future ALMA technical development effort. The working group has prepared an updated set of technical goals for Front-end and Digitizer products to enable the scientific needs as stipulated in the ALMA 2030 Development Roadmap. This manuscript describes the working group’s considerations of system trade-offs and feasibility studies and presents tentative specifications arrived at for some of the key technical requirement goals.
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