Results 91 to 100 of about 153 (136)

The x-ray polarimeter instrument on board the Polarimeter for Relativistic Astrophysical X-ray Sources (PRAXyS) mission

SPIE Proceedings, 2016
The Polarimeter for Relativistic Astrophysical X-ray Sources (PRAXyS) is one of three Small Explorer (SMEX) missions selected by NASA for Phase A study. The PRAXyS observatory carries an X-ray Polarimeter Instrument (XPI) capable of measuring the linear polarization from a variety of high energy sources, including black holes, neutron stars, and ...
J. E. Hill, J. K. Black, K. Jahoda, T. Tamagawa, W. Iwakiri, T. Kitaguchi, M. Kubota, P. Kaaret, R. McCurdy, D. M. Miles, T. Okajima, Y. Soong, L. Olsen, L. Sparr, S. J. Mosely, D. Nolan   +15 more
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The Milano polarimeter: An instrument to search for large scale polarization of the cosmic microwave background

AIP Conference Proceedings, 2002
The expected polarized component of the CMB signal is extremely faint. On degree angular scales and above it can be in the range of one part to 106 or 107. To detect such an elusive signal a dedicated instrument must be designed. In this contribution we present the new Milano polarimeter, a 33 GHz correlation system able to detect both linear and ...
ZANNONI, MARIO, Battistelli, E, BOELLA, GIULIANO FILIPPO, Cavaliere, F, GERVASI, MASSIMO, PASSERINI, ANDREA, SIRONI, GIORGIO   +6 more
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Feedhorn-Coupled TES Polarimeters for Next-Generation CMB Instruments

AIP Conference Proceedings, 2009
The next generation of cosmic microwave background (CMB) polarization experiments targeting the signatures of inflation will require unprecedented sensitivities in addition to careful control of systematics. With existing detector technologies approaching the photon noise limit, improvements in system sensitivities must come from ever‐larger focal ...
K. W. Yoon, J. W. Appel, J. E. Austermann, J. A. Beall, D. Becker, B. A. Benson, L. E. Bleem, J. Britton, C. L. Chang, J. E. Carlstrom, H.-M. Cho, A. T. Crites, T. Essinger-Hileman, W. Everett, N. W. Halverson, J. W. Henning, G. C. Hilton, K. D. Irwin, J. McMahon, J. Mehl, S. S. Meyer, S. Moseley, M. D. Niemack, L. P. Parker, S. M. Simon, S. T. Staggs, K. U-yen, C. Visnjic, E. Wollack, Y. Zhao, Betty Young, Blas Cabrera, Aaron Miller   +32 more
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Millipol, a millimeter/submillimeter wavelength polarimeter - Instrument, operation, and calibration

Publications of the Astronomical Society of the Pacific, 1990
An instrument capable of measuring the polarization characteristics of weakly polarized, cold dust at millimeter and submillimeter wavelengths is presented in detail. The operation and calibration of this polarimeter at a wavelength of 1300 microns, configured for the NRAO 12-meter telescope, are discussed.
Dan P. Clemens, Brian D. Kane, Robert W. Leach, Richard Barvainis   +3 more
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Multislit spectro-polarimeter: a facility instrument for the Multiapplication Solar Telescope

Journal of Astronomical Telescopes, Instruments, and Systems, 2019
<p>The multislit spectro-polarimeter (MSSP) is a grating-based littrow spectrograph with five slits at the entrance aperture. The polarimeter consists of a nematic liquid crystal variable retarder as the modulator and a Savart plate as an analyzer.
Mohanakrishna Ranganathan, Raja Bayanna, Sankarasubramanian Kasiviswanathan, Shibu Mathew   +3 more
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Imaging polarimeters based on liquid crystal variable retarders: an emergent technology for space instrumentation

SPIE Proceedings, 2011
Peerreview
Alvarez-Herrero, A., Uribe-Patarroyo, N., García Parejo, P., Vargas, J., Heredero, R.L., Restrepo, R., Martínez-Pillet, V., Del Toro Iniesta, J.C., López, A., Fineschi, S., Capobianco, G., Georges, M., López, M., Boer, G., Manolis, I.   +14 more
openaire   +3 more sources

Optical efficiency of feedhorn-coupled TES polarimeters for next-generation CMB instruments

SPIE Proceedings, 2010
The next generation of Cosmic Microwave Background (CMB) experiments probing for signals of inflation and small angular scale polarization anisotropies require higher sensitivity and better control of systematics. We are developing monolithic arrays of orthomode transducer (OMT) coupled transition edge sensor (TES) polarimeters designed for ...
J. W. Henning, J. W. Appel, J. E. Austermann, J. A. Beall, D. Becker, D. A. Bennett, L. E. Bleem, B. A. Benson, J. Britton, J. E. Carlstrom, C. L. Chang, H. M. Cho, A. T. Crites, T. Essinger-Hileman, W. Everett, E. M. George, N. W. Halverson, G. C. Hilton, W. L. Holzapfel, J. Hubmayr, K. D. Irwin, D. Li, J. McMahon, J. Mehl, S. S. Meyer, S. Moseley, J. P. Nibarger, M. D. Niemack, L. P. Parker, E. Shirokoff, S. M. Simon, S. T. Staggs, J. N. Ullom, K. U-Yen, C. Visnjic, E. Wollack, K. W. Yoon, E. Y. Young, Y. Zhao   +38 more
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The Diffraction Limited Spectro-Polarimeter: a new instrument for high-resolution solar polarimetry

SPIE Proceedings, 2004
The National Solar Observatory in collaboration with the High-Altitude Observatory is developing a new solar polarimeter, the Diffraction Limited Spectro-Polarimeter. In conjunction with a new high-order adaptive optics system at the NSO Dunn Solar Telescope, the DLSP design facilitates very high angular resolution observations of solar vector ...
K. Sankarasubramanian, Craig Gullixson, Stephen Hegwer, Thomas R. Rimmele, Scott Gregory, Tony Spence, Stephen Fletcher, Kit Richards, Emilie Rousset, Bruce Lites, David Elmore, Kim Streander, Michael Sigwarth   +12 more
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Characterization of Detectors and Instrument Systematics for the SPIDER CMB Polarimeter

2014
We know from the CMB and observations of large-scale structure that the universe is extremely flat, homogenous, and isotropic. The current favored mechanism for generating these characteristics is inflation, a theorized period of exponential expansion of the universe that occurred shortly after the Big Bang.
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Characterization of Instrument Effects in Imaging and Non-Imaging Polarimeters

2004
Abstract : The purpose of this one-year effort was to identify and investigate some important effects that the optical systems have on the performance of imaging and non-imaging polarimeters. During our period of performance we concentrated on two primary areas; 1) Characterization of the effects of systematic errors in the polarization optics of non ...
openaire   +1 more source