Five-hundred-meter Aperture Spherical radio Telescope

 

FAST has three outstanding features: the unique karst depressions found in south Guizhou as the sites, the active main reflector of 500 m which directly corrects for spherical aberration, and the light-weight focus cabin driven by cables and a servomechanism plus a parallel robot as a secondary adjustable system to carry the most precise parts of the receivers. Inside the cabin, multi-beam and multi-band receivers will be installed covering a frequency range of 70MHz - 3 GHz. The telescope will be equipped with a variety of instruments and terminals for different scientific proposes. The main technical specifications of FAST are listed in the Table.

Table. FAST main technical specification

Spherical reflector

Radius~300m, Aperture~500m, Opening angle100°-120°

Illuminated aperture

Dill=300m

Focal ratio

0.46-0.47

Sky coverage

Zenith angle 40°, tracking range 4-6h

Frequency

70MHz-3GHz

Sensitivity (L-Band)

Antenna effective area/system noise temperature ratio A/T~2000m*m/K, System temperature T~20K

Polarization

Full polarization (dual linear/circular polarization),Polarization isolation >30dB

Resolution (L-Band)

2.9′

Multi-beam (L-Band)

19

Slewing

<10min

Pointing accuracy

8″