NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Cosmology Large Angular Scale Surveyor (CLASS) Focal Plane DevelopmentThe Cosmology Large Angular Scale Surveyor (CLASS) will measure the polarization of the Cosmic Microwave Background to search for and characterize the polarized signature of inflation. CLASS will operate from the Atacama Desert and observe approx.70% of the sky. A variable-delay polarization modulator provides modulation of the polarization at approx.10Hz to suppress the 1/f noise of the atmosphere and enable the measurement of the large angular scale polarization modes. The measurement of the inflationary signal across angular scales that spans both the recombination and reionization features allows a test of the predicted shape of the polarized angular power spectra in addition to a measurement of the energy scale of inflation. CLASS is an array of telescopes covering frequencies of 38, 93, 148, and 217 GHz. These frequencies straddle the foreground minimum and thus allow the extraction of foregrounds from the primordial signal. Each focal plane contains feedhorn-coupled transition-edge sensors that simultaneously detect two orthogonal linear polarizations. The use of single-crystal silicon as the dielectric for the on-chip transmission lines enables both high efficiency and uniformity in fabrication. Integrated band definition has been implemented that both controls the bandpass of the single-mode transmission on the chip and prevents stray light from coupling to the detectors.
Document ID
20160007357
Document Type
Reprint (Version printed in journal)
Authors
Chuss, D. T. (Villanova Univ. PA, United States)
Ali, A. (Johns Hopkins Univ. Baltimore, MD, United States)
Amiri, M. (British Columbia Univ. Vancouver, British Columbia, Canada)
Appel, J. (Johns Hopkins Univ. Baltimore, MD, United States)
Bennett, C. L. (Johns Hopkins Univ. Baltimore, MD, United States)
Colazo, F. (Adnet Systems, Inc. Greenbelt, MD, United States)
Denis, K. L. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Dunner, R. (Universidad Catolica de Chile Santiago, Chile)
Essinger-Hileman, T. (Johns Hopkins Univ. Baltimore, MD, United States)
Eimer, J. (Johns Hopkins Univ. Baltimore, MD, United States)
Fluxa, P. (Universidad Catolica de Chile Santiago, Chile)
Gothe, D. (Johns Hopkins Univ. Baltimore, MD, United States)
Halpern, M. (British Columbia Univ. Vancouver, British Columbia, Canada)
Harrington, K. (Johns Hopkins Univ. Baltimore, MD, United States)
Hilton, G. (National Inst. of Standards and Technology Boulder, CO, United States)
Hinshaw, G. (British Columbia Univ. Vancouver, British Columbia, Canada)
Hubmayr, J. (National Inst. of Standards and Technology Boulder, CO, United States)
Iuliano, J. (Johns Hopkins Univ. Baltimore, MD, United States)
Marriage, T. A. (Johns Hopkins Univ. Baltimore, MD, United States)
Miller, N. (Johns Hopkins Univ. Baltimore, MD, United States)
Moseley, S. H. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Mumby, G. (Johns Hopkins Univ. Baltimore, MD, United States)
Petroff, M. (Johns Hopkins Univ. Baltimore, MD, United States)
Reintsema, C. (National Inst. of Standards and Technology Boulder, CO, United States)
Rostem, K. (Johns Hopkins Univ. Baltimore, MD, United States)
U-yen, K. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Watts, D. (Johns Hopkins Univ. Baltimore, MD, United States)
Wagner, E. (Johns Hopkins Univ. Baltimore, MD, United States)
Wollack, E. J. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Xu, Z. (Johns Hopkins Univ. Baltimore, MD, United States)
Zeng, L. (Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Date Acquired
June 8, 2016
Publication Date
December 14, 2015
Publication Information
Publication: Journal of Low Temperature Physics
Subject Category
Astrophysics
Report/Patent Number
GSFC-E-DAA-TN32347
Funding Number(s)
CONTRACT_GRANT: NNX14AB76A
CONTRACT_GRANT: NNX14AM49H
CONTRACT_GRANT: NNG12PL17C
Distribution Limits
Public
Copyright
Other
Keywords
polarized signature of inflation
Cosmology Large Angular Scale Surveyor (CLASS)
large angular scale polarization