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Design of 280 GHz feedhorn-coupled TES arrays for the balloon-borne polarimeter SPIDER

Published

Author(s)

Johannes Hubmayr, Jason E. Austermann, James A. Beall, Daniel T. Becker, Shannon M. Duff, Arpi L. Grigorian, Gene C. Hilton, Joel N. Ullom, Michael R. Vissers

Abstract

We describe 280 GHz bolometric detector arrays that instrument the balloon-borne polarimeter spider. A primary science goal of spider is to measure large-scale B-mode polarization of the cosmic microwave back-ground (cmb) in search of the cosmic-inflation gravity-wave signature. 280 GHz channels aid this science goal by constraining the level of B-mode contamination from galactic dust emission. We present the focal plane unit design, which consists of a 16x16 array of conical, corrugated feedhorns coupled to a monolithic detector array fabricated on a 150 mm diameter silicon wafer. Detector arrays are capable of polarimetric sensing via waveguide probe-coupling to a multiplexed array of transition-edge-sensor (TES) bolometers. Three such focal plane units instrument the spider receiver, which in total contains 765 spatial pixels and 1,530 polarization sensitive bolometers at 280 GHz. By fabrication and measurement of single feedhorns, we demonstrate 14.7 FHWM Gaussian-shaped beams with
Citation
Proceedings of SPIE
Volume
v2
Created July 7, 2016, Updated November 10, 2018