A Characterization of the ALMA Phasing System at 345 GHz
G. Crew, C. Goddi, Lynn D. Matthews, Helge Rottmann, Alejandro Sáez, I. Martí‐Vidal
Abstract
Abstract The development of the Atacama Large Millimeter/submillimeter Array (ALMA) phasing system (APS) has allowed ALMA to function as an extraordinarily sensitive station for very long baseline interferometry (VLBI) at frequencies of up to 230 GHz ( λ ≈ 1.3 mm). Efforts are now underway to extend the use of the APS to 345 GHz ( λ ≈ 0.87 mm). Here we report a characterization of APS performance at 345 GHz based on a series of tests carried out between 2015 and 2021, including a successful global VLBI test campaign conducted in 2018 October in collaboration with the Event Horizon Telescope.
Topics & Concepts
Very-long-baseline interferometryMillimeterSubmillimeter ArrayInterferometryPhysicsTelescopeAstronomyPhaserRemote sensingAstrophysicsOpticsGeologyGalaxyStar formationAstrophysics and Cosmic PhenomenaRadio Astronomy Observations and TechnologySuperconducting and THz Device Technology