Publication Date:
2021-02-17
Description:
In press. Copyright 2012 Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited
Description:
The balloon-borne LSPE mission is optimized to measure the linear polarization of the Cosmic Microwave Background
at large angular scales. The Short Wavelength Instrument for the Polarization Explorer (SWIPE) is composed of 3 arrays
of multi-mode bolometers cooled at 0.3K , with optical components and filters cryogenically cooled below 4K to reduce
the background on the detectors. Polarimetry is achieved by means of large rotating half-wave plates and wire-grid
polarizers in front of the arrays. The polarization modulator is the first component of the optical chain, reducing
significantly the effect of instrumental polarization. In SWIPE we trade angular resolution for sensitivity. The diameter
of the entrance pupil of the refractive telescope is 45 cm, while the field optics is optimized to collect tens of modes for
each detector, thus boosting the absorbed power. This approach results in a FWHM resolution of 1.8, 1.5, 1.2 degrees at
95, 145, 245 GHz respectively. The expected performance of the three channels is limited by photon noise, resulting in a
final sensitivity around 0.1-0.2 μK per beam, for a 13 days survey covering 25% of the sky
Description:
Italian Space Agency
Description:
Published
Description:
84523F
Description:
1.10. TTC - Telerilevamento
Description:
N/A or not JCR
Description:
open
Keywords:
Cosmic Microwave Backgorund
;
Polarization, Bolometer
;
Overmoded Microwave Optics
;
05. General::05.04. Instrumentation and techniques of general interest::05.04.99. General or miscellaneous
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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