An aperture-synthesis array for millimetre- and submillimetre-wavelength astronomy built jointly by the European Southern Observatory, the US National Radio Astronomy Observatory, and the National Astronomical Observatory of Japan, at an altitude of 5000 m on the Chajnantor plateau of the Atacama desert in northern Chile. Limited observations began in 2011 and it became fully operational in 2013. ALMA consists of 66 dishes operating at wavelengths of 0.3 to 8.5 mm. The ALMA main array consists of fifty 12-m dishes that can be arranged with baselines up to 16 km, while the Atacama Compact Array (ACA) consists of four 12-m dishes and twelve 7-m ones in an area 250 m wide for imaging extended sources.
http://www.eso.org/public/images/alma-chajnantor-scene1/
http://www.almaobservatory.org/ Official telescope website.https://science.nrao.edu/facilities/alma Information page at NRAO.
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