POLARBEAR
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| Observatory | Simons Array Simons Observatory 
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| Location(s) |
Atacama Desert, Chile
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| Coordinates | 22°57′29″S 67°47′10″W / 22.958064°S 67.786222°WCoordinates: 22°57′29″S 67°47′10″W / 22.958064°S 67.786222°W |
| Altitude | 5,200 m (17,100 ft) |
| Built | 2010– |
| First light | 2012
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| Telescope style |
Cosmic microwave background experiment radio telescope
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| Website | bolo |
 Location of POLARBEAR
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POLARBEAR is a cosmic microwave background polarization experiment located in the Atacama Desert of northern Chile in the Antofagasta Region. The POLARBEAR experiment is mounted on the Huan Tran Telescope (HTT) at the James Ax Observatory in the Chajnantor Science Reserve. The HTT is located near the Atacama Cosmology Telescope on the slopes of at an altitude of nearly 5,200 m (17,100 ft).
POLARBEAR was developed by an international collaboration which includes University of California, Berkeley, Lawrence Berkeley National Lab, University of Colorado at Boulder, University of California, San Diego, Imperial College, Laboratoire Astroparticule et Cosmologie of the Paris Diderot University, KEK (High Energy Accelerator Research Organization), McGill University, and Cardiff University.
The instrument was first installed at the Combined Array for Research in Millimeter-wave Astronomy site near Westgard Pass in California (USA) for an engineering run in 2010. It was then moved to its final destination in the Atacama Desert in September 2011. POLARBEAR saw first light on January 10, 2012, and began its first observing season in April 2012.
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