Design SuPy is now under design study phase. The current baseline is pyramid-base wavefront sensor, however, the key elements in optics and electronics will be selected over next 12 months.

AO Mux The most critical element in the instrument design at the moment is the choice of the detector. The adaptive optics multiplexer (AO Mux)is a readout device spatially developed for the applications that need fast readout (frame rate ~ 800/s for 256x256 pix) and low readout noise (<5e- per CDS). The AO Mux is to be coupled with infrared detector arrays with pixel scale 40 um, or with CMOS-base optical detectors.

Reflective Pyramid The current design assumes a reflective pyramid at the focal plane of the instrument. The primary advantages of a reflective pyramid over traditional refractive one are the flexibility in the optical design and the precision machining of the optics. Manufacturing of a pyramid with an accurate tip is a major limiting factor of the instrument design. With direct diamond ruling of metal or infrared plastic, the gaps between the facets could be less than 1-5 um from current ~10-20 um.