The CLASS 150/220 GHz Polarimeter Array: Design, Assembly, and Characterization

Understand

We report on the development of a polarization-sensitive dichroic (150/220 GHz) detector array for the Cosmology Large Angular Scale Surveyor (CLASS) delivered to the telescope site in June 2019.

• In concert with existing 40 and 90 GHz telescopes, the 150/220 GHz telescope will make observations of the cosmic microwave background over large angular scales aimed at measuring the primordial B-mode signal, the optical depth to reionization, and other fundamental physics and cosmology.
• The 150/220 GHz focal plane array consists of three detector modules with 1020 transition edge sensor (TES) bolometers in total.
• Each dual-polarization pixel on the focal plane contains four bolometers to measure the two linear polarization states at 150 and 220 GHz.