@inproceedings{eeaaf4ad6ab14324ae441bae77c8d89a,
title = "Design of 280 GHz feedhorn-coupled TES arrays for the balloon-borne polarimeter SPIDER",
abstract = "We describe 280 GHz bolometric detector arrays that instrument the balloon-borne polarimeter spider. A primary science goal of spider is to measure the large-scale B-mode polarization of the cosmic microwave background (cmb) in search of the cosmic-inflation, gravitational-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. The spider receiver has three focal plane units at 280 GHz, which in total contains 765 spatial pixels and 1,530 polarization sensitive bolometers. By fabrication and measurement of single feedhorns, we demonstrate 14.7° FHWM Gaussian-shaped beams with <1% ellipticity in a 30% fractional bandwidth centered at 280 GHz. We present electromagnetic simulations of the detection circuit, which show 94% band-averaged, single-polarization coupling efficiency, 3% reflection and 3% radiative loss. Lastly, we demonstrate a low thermal conductance bolometer, which is well-described by a simple TES model and exhibits an electrical noise equivalent power (NEP) = 2.6 x 10-17 W/√Hz, consistent with the phonon noise prediction.",
keywords = "Bolometer, CMB, Feedhorn, Polarimetry, TES",
author = "Johannes Hubmayr and Austermann, {Jason E.} and Beall, {James A.} and Becker, {Daniel T.} and Benton, {Steven J.} and Bergman, {A. Stevie} and Bond, {J. Richard} and Sean Bryan and Duff, {Shannon M.} and Duivenvoorden, {Adri J.} and Eriksen, {H. K.} and Filippini, {Jeffrey P.} and A. Fraisse and Mathew Galloway and Gambrel, {Anne E.} and K. Ganga and Grigorian, {Arpi L.} and Riccardo Gualtieri and Gudmundsson, {Jon E.} and Hartley, {John W.} and M. Halpern and Hilton, {Gene C.} and Jones, {William C.} and McMahon, {Jeffrey J.} and Lorenzo Moncelsi and Nagy, {Johanna M.} and Netterfield, {C. B.} and Benjamin Osherson and Ivan Padilla and Rahlin, {Alexandra S.} and B. Racine and John Ruhl and Rudd, {T. M.} and Shariff, {J. A.} and Soler, {J. D.} and Xue Song and Ullom, {Joel N.} and {Van Lanen}, Jeff and Vissers, {Michael R.} and Wehus, {I. K.} and Shyang Wen and Wiebe, {D. V.} and Edward Young",
note = "Publisher Copyright: {\textcopyright} 2016 SPIE.; Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VIII ; Conference date: 28-06-2016 Through 01-07-2016",
year = "2016",
doi = "10.1117/12.2231896",
language = "English (US)",
series = "Proceedings of SPIE - The International Society for Optical Engineering",
publisher = "SPIE",
editor = "Jonas Zmuidzinas and Holland, {Wayne S.}",
booktitle = "Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VIII",
}