FD Station, Telescope, and Camera
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The Telescope Array has three fluorescence detector (FD) telescope stations. As in the previous Fly's Eye and High Resolution Fly's Eye (HiRes) experiments, these detectors work by measuring the air fluorescence light emitted by an extensive air shower. Each FD telescope consists of a primary mirror (made up of 18 smaller hexagonal mirror segments) and a camera. The cameras are made up of 256 PMTs (photomultiplier tubes) which are sensitive to the ultra violet light generated by a cosmic ray air shower.
The stations are located on a triangle about 35 km apart from one another. Each station has 12-14 telescopes viewing the range from 3 to 33 degrees in elevation. The three sites are named Black Rock Mesa (BRM), Long Ridge (LR), and Middle Drum (MD). By combining the data from the three sites, it is possible to determine the primary energy, the arrival direction, and the maximum point of longitudinal development for an air shower.
| Black Rock Mesa | 39°11′18″N 112°42′42″W / 39.18833°N 112.71167°W / 39.18833; -112.71167 (Black Rock Mesa) | |
| Long Ridge | 39°12′28″N 113°07′17″W / 39.20778°N 113.12139°W / 39.20778; -113.12139 (Long Ridge) | |
| Middle Drum | 39°28′22″N 112°59′37″W / 39.47278°N 112.99361°W / 39.47278; -112.99361 (Middle Drum) | |
| Central Laser Facility | 39°17′49″N 112°54′31″W / 39.29694°N 112.90861°W / 39.29694; -112.90861 (Central Laser Facility) |
Read more about this topic: Telescope Array Project
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