Astronomy and Astrophysics – Astrophysics – Instrumentation and Methods for Astrophysics
Scientific paper
2010-08-23
Astronomy and Astrophysics
Astrophysics
Instrumentation and Methods for Astrophysics
4 pages, 5 figures, Proceedings of the Thirteenth International Conference on Low-Temperature Detectors
Scientific paper
The Atacama B-mode Search (ABS) experiment is a 145 GHz polarimeter designed to measure the B-mode polarization of the Cosmic Microwave Background (CMB) at large angular scales. The ABS instrument will ship to the Atacama Desert of Chile fully tested and ready to observe in 2010. ABS will image large-angular-scale CMB polarization anisotropies onto a focal plane of 240 feedhorn-coupled, transition-edge sensor (TES) polarimeters, using a cryogenic crossed-Dragone design. The ABS detectors, which are fabricated at NIST, use orthomode transducers to couple orthogonal polarizations of incoming radiation onto separate TES bolometers. The incoming radiation is modulated by an ambient-temperature half-wave plate in front of the vacuum window at an aperture stop. Preliminary detector characterization indicates that the ABS detectors can achieve a sensitivity of 300 $\mu K \sqrt{s}$ in the field. This paper describes the ABS optical design and detector readout scheme, including feedhorn design and performance, magnetic shielding, focal plane architecture, and cryogenic electronics.
Appel John William
Beall James A.
Cho Hsaio-Mei
Essinger-Hileman Thomas
Fowler Jim
No associations
LandOfFree
The Atacama B-Mode Search: CMB Polarimetry with Transition-Edge-Sensor Bolometers does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The Atacama B-Mode Search: CMB Polarimetry with Transition-Edge-Sensor Bolometers, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Atacama B-Mode Search: CMB Polarimetry with Transition-Edge-Sensor Bolometers will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-392894