The Schwarzschild-Couder Telescope (SCT), a dual mirror version of the Medium-Sized Telescope (MST), is proposed as a high-performance alternative to the MST. In collaboration with the SST-2M and MST groups on common components, institutes in the United States have been the pioneers of the SCT design since 2006. The SCT features a two-mirror optical system designed to cancel aberrations and de-magnify the images, so as to be compatible with a compact, high-resolution camera. The design achieves substantially better angular resolution over a wider field of view than classical single-mirror Cherenkov telescopes.
The SCTs have improved angular resolution as a result of a smaller point spread function (PSF) and the very large number of camera pixels (>11000), based on silicon photomultipliers (SiPMs), covering 8 degree field of view. Both the 9.7 m diameter primary and 5.4 m secondary mirrors are segmented and have active alignment. The SCT uses the same positioner as the MST and the camera technology developed for the SCT is also used in the SST-2M GCT. The main parameters of the SCT are in the below table.