CARMA: A new heterogeneous millimeter-wave interferometer

D. P. Woody, A. J. Beasley, A. Bolatto, J. Carlstrom, A. Harris, D. Hawkins, J. Lamb, L. Looney, L. G. Mundy, R. Plambeck, S. Scott, M. Wright

Research output: Contribution to journalConference articlepeer-review


A new Combined Array for Research in Millimeter-wave Astronomy (CARMA) interferometer is being assembled from the existing Owens Valley Radio Observatory (OVRO), the Berkeley-Illinois-Maryland Association (BIMA) millimeter interferometers and the new Sunyaev-Zeldovich Array (SZA) at Cedar Flat, a site at 2,200 m altitude in the Inyo Mountains east of OVRO. The array will consist of 23 antennas of three different diameters, 3.5, 6.1 and 10.4 m, and will support observations in the 1 cm, 3 mm and 1.3 mm bands. The fist-light correlator is a flexible FPGA based system that will process up to 8 GHz of bandwidth on the sky for two subarrays consisting of 8 and 15 elements. The array configurations will offer antenna spacings from 5 m to 1.9 km allowing unprecedented high resolution and wide field imaging at millimeter wavelengths. Radiometers observing the 22 GHz water vapor emission line will be used to measure and correct for the water vapor induced path delay along the line of sight for each telescope and thereby minimize the time lost to "bad seeing". This university based facility will emphasize technology development and student training along with leading edge astronomical research in areas ranging from Sunyaev-Zeldovich effect galaxy cluster surveys to studying protoplanetary disks.

Original languageEnglish (US)
Article number04
Pages (from-to)30-41
Number of pages12
JournalProceedings of SPIE - The International Society for Optical Engineering
StatePublished - 2004
EventMillimeter and Submillimeter Detectors for Astronomy II - Glasgow, United Kingdom
Duration: Jun 23 2004Jun 25 2004


  • Antennas
  • Correlator
  • Millimeter Interferometry
  • Radio Astronomy
  • Water Vapor Radiometry

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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