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{{short description|Research project to observe air showers}}
{{Use American English|date=July 2025}}
{{Infobox telescope|___location=[[Millard County, Utah]], US}}
The '''Telescope Array project''' is an international collaboration involving research and educational institutions in Japan, The United States, Russia, South Korea, and Belgium.<ref name=Tokuno>{{cite journal|last=Tokuno|first=H.|display-authors=etal |title=New air fluorescence detectors employed in the Telescope Array experiment|journal=Nuclear Instruments and Methods in Physics Research A|date=21 February 2012|volume=676|pages=54–65|doi=10.1016/j.nima.2012.02.044|arxiv = 1201.0002 |bibcode = 2012NIMPA.676...54T |s2cid=9896454}}</ref> The experiment is designed to observe air showers induced by [[ultra-high-energy cosmic ray]] using a combination of ground array and air-fluorescence techniques. It is located in the high desert in [[Millard County, Utah|Millard County]], [[Utah]], United States, at about {{convert|1400|m|ft|sp=us}} above sea level.
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The Lon and Mary Watson Millard County Cosmic Ray Center was dedicated on March 20, 2006.<ref>Draper, Dean (March 22, 2006). "Cosmic ray center dedicated". Millard County Chronicle Progress</ref> The center is located at 648 West Main Street in Delta. The building serves as a headquarters and data processing center for the Telescope Array Project.
In October 2011, a new visitor center was opened at the Cosmic Ray Center. It features displays about the history of cosmic ray research in Utah and about the Telescope Array, which is spread across the desert west of Delta. The center also includes a display about the nearby [[Topaz War Relocation Center|Topaz internment camp]], where U.S. citizens of Japanese descent were imprisoned during World War II.
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The Telescope Array RADAR (TARA) Project is an effort to overcome some of the problems inherent to existing cosmic ray detection techniques. Due to sun, moon and weather, fluorescence telescopes are usually limited to a ten percent duty cycle. Ground arrays can run during the day, but require a large amount of land, making it necessary to build them in remote locations. The goal of the TARA Project is to develop a [[bistatic radar]] detection system that is able to maintain a 24-hour duty cycle at a fraction of the cost of conventional detection systems.<ref name=AbouBakrOthman2011>{{cite journal|last=Abou Bakr Othman|first=M.|display-authors=etal |title=Radar Detection of UHECR Air Showers at the Telescope Array|journal=32nd International Cosmic Ray Conference, Beijing 2011|date=2011}}</ref>
In September 2012, the [[W. M. Keck Foundation]] awarded researchers at the University of Utah a $1 million grant to develop a bistatic radar detection system. This system will be built alongside the existing Telescope Array and will use analog television transmitters and digital receivers to observe the range, direction and strength of cosmic rays in order to trace them back to their point of origin.<ref name=EON2012>{{cite news|title=University of Utah Awarded $1 Million by Keck Foundation to Study Cosmic Rays|url=http://eon.businesswire.com/news/eon/20120925005365/en/University-Utah-Awarded-1-Million-Keck-Foundation|accessdate=2 July 2013|newspaper=EON: Enhanced Online News|date=September 25, 2012}}{{Dead link|date=August 2025 |bot=InternetArchiveBot |fix-attempted=yes }}</ref> Once completed, this new facility will be known as the W.M. Keck Radar Observatory<ref name=EON2012 /><ref name=Lee2012>{{cite news|last=Lee|first=Jasen|title=$1M grant awarded to U. to study cosmic particles|url=http://www.ksl.com/?nid=148&sid=22296297|accessdate=2 July 2013|newspaper=KSL|date=September 25, 2012}}</ref>
==See also==
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