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The South Pole Telescope SZ-Receiver Detectors

By: Chang, C.L.; Hsiao-Mei Cho; Benson, B.A.; Shirokoff, E.; Vieira, J.D.; Spieler, H.G.; Plagge, T.; Mehl, J.; Lueker, M.; Bleem, L.E.; Lee, A.T.; Lanting, T.; Holzapfel, W.L.; Dobbs, M.A.; Crites, A.T.;

2009 / IEEE


This item was taken from the IEEE Periodical ' The South Pole Telescope SZ-Receiver Detectors ' We will discuss the design, fabrication, and testing of a 960-element TES array installed on the new 10 meter South Pole Telescope (SPT). This array is designed to survey for galaxy clusters using the Sunyaev-Zel'dovich (SZ) effect, which is the inverse-Compton scattering of Cosmic Microwave Background photons by plasma bound to clusters of galaxies. The SPT bolometer array consists of fully lithographed spider-web absorbers fabricated on adhesive-bonded silicon wafers with an embedded metal back plane. The absorbers are connected to aluminum-titanium bilayer TESs with a transition temperature of approximately 550 mK. Additional normal-metal features adjust the devices' thermal properties to suit our readout system and observational strategy. The focal plane is cooled using a commercial, closed cycle, pulse-tube refrigerator and a three-stage helium sorption refrigerator with a 250 mK base temperature.