The design of the Ali CMB Polarization Telescope receiver

Understand

Ali CMB Polarization Telescope (AliCPT-1) is the first CMB degree-scale polarimeter to be deployed on the Tibetan plateau at 5,250m above sea level.

• AliCPT-1 is a 90/150 GHz 72 cm aperture, two-lens refracting telescope cooled down to 4 K.
• Alumina lenses, 800mm in diameter, image the CMB in a 33.4{\deg} field of view on a 636mm wide focal plane.
• The modularized focal plane consists of dichroic polarization-sensitive Transition-Edge Sensors (TESes).