An Overview of the Submillimeter Array Telescope
The Submillimeter Array (SMA) is a new interferometer dedicated to observations in millimeter and sub-millimeter wavelengths. It is located on Mauna Kea, Hawaii, near the CSO and JCMT facilities and was commissioned in November 2003 . The array consists of eight 6-meter diameter antennas which can be moved among 24 pads on the sides of four Reuleaux triangles, producing a maximum angular resolution of 0″.1. Each antenna is equipped with a cryostat at its Nasmyth focus which will accept eight receivers covering all usable bands from 175 GHz to 920 GHz. Signal processing is performed on a special purpose XF correlator, which is based on an ASIC developed at the Haystack Observatory and the NASA/SERC for VLSI Design. The highly flexible correlator will accept two channels of 2 GHz bandwidth from each antenna, making possible either dual polarization or simultaneous dual frequency operation. A pilot program to include the 15m JCMT and 10.4m CSO as part of the SMA will begin in 2005.
KeywordsMixer Block Dual Polarization Direct Digital Synthesizer Local Oscillator Signal Reuleaux Triangle
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