The Atacama Large Millimeter/submillimeter Array (ALMA), an international partnership of Europe, Nor th America and East Asia in cooperation with the Republic of Chile, is the largest astronomical project in existence. ALMA will be a single telescope of revolutionary design, composed initially of 66 high precision antennas located on the Chajnantor plateau, 5000 meters altitude in northern Chile. A weak signal from distant galaxies is mixed with the reference signal by low-noise superconducting (SIS) mixers at 4 K (-269 °C) and its microwave output is amplified for further processing. These receivers detect two orthogonal polarizations to reveal magnetic field structure in the universe with the state-of-the art performance.

* These receiver bands will not be available at the begining of full operation in 2013.