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Proceedings Paper

Detector architecture of the cosmology large angular scale surveyor
Author(s): K. Rostem; C. L. Bennett; D. T. Chuss; N. Costen; E. Crowe; K. L. Denis; J. R. Eimer; N. Lourie; T. Essinger-Hileman; T. A. Marriage; S. H. Moseley; T. R. Stevenson; D. W. Towner; G. Voellmer; E. J. Wollack; L. Zeng
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Paper Abstract

The cosmic microwave background (CMB) provides a powerful tool for testing modern cosmology. In particular, if inflation has occurred, the associated gravitational waves would have imprinted a specific polarized pattern on the CMB. Measurement of this faint polarized signature requires large arrays of polarization-sensitive, background- limited detectors, and an unprecedented control over systematic effects associated with instrument design. To this end, the ground-based Cosmology Large Angular Scale Surveyor (CLASS) employs large-format, feedhorn- coupled, background-limited Transition-Edge Sensor (TES) bolometer arrays operating at 40, 90, and 150 GHz bands. The detector architecture has several enabling technologies. An on-chip symmetric planar orthomode transducer (OMT) is employed that allows for highly symmetric beams and low cross-polarization over a wide bandwidth. Furthermore, the quarter-wave backshort of the OMT is integrated using an innovative indium bump bonding process at the chip level that ensures minimum loss, maximum repeatability and performance uniformity across an array. Care has been taken to reduce stray light and on-chip leakage. In this paper, we report on the architecture and performance of the first prototype detectors for the 40 GHz focal plane.

Paper Details

Date Published: 24 September 2012
PDF: 7 pages
Proc. SPIE 8452, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VI, 84521N (24 September 2012); doi: 10.1117/12.927056
Show Author Affiliations
K. Rostem, NASA Goddard Space Flight Ctr. (United States)
C. L. Bennett, Johns Hopkins Univ. (United States)
D. T. Chuss, NASA Goddard Space Flight Ctr. (United States)
N. Costen, NASA Goddard Space Flight Ctr. (United States)
E. Crowe, NASA Goddard Space Flight Ctr. (United States)
K. L. Denis, NASA Goddard Space Flight Ctr. (United States)
J. R. Eimer, Johns Hopkins Univ. (United States)
N. Lourie, NASA Goddard Space Flight Ctr. (United States)
T. Essinger-Hileman, Johns Hopkins Univ. (United States)
T. A. Marriage, Johns Hopkins Univ. (United States)
S. H. Moseley, NASA Goddard Space Flight Ctr. (United States)
T. R. Stevenson, NASA Goddard Space Flight Ctr. (United States)
D. W. Towner, NASA Goddard Space Flight Ctr. (United States)
G. Voellmer, NASA Goddard Space Flight Ctr. (United States)
E. J. Wollack, NASA Goddard Space Flight Ctr. (United States)
L. Zeng, Johns Hopkins Univ. (United States)


Published in SPIE Proceedings Vol. 8452:
Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VI
Wayne S. Holland, Editor(s)

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