Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20924004h&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #240.04; Bulletin of the American Astronomical Society,
Astronomy and Astrophysics
Astronomy
Scientific paper
We discuss the status of EBEX, a NASA funded balloon-borne polarimeter equipped with 1462 bolometric transition edge sensor (TES) detectors and designed to measure the B-mode polarization of the cosmic microwave background radiation. EBEX will scan 350 square degrees of the sky over a 14 day long-duration balloon flight. Given the expected sensitivity we will put a 2σ upper limit of r ≤ 0.03. The EBEX instrument employs a 1.5 meter Gregorian-type telescope giving 8 arcminute resolution. Three frequency bands at 150, 250 and 420 GHz provide strong leverage against polarized dust foreground. Systematic errors are controlled by modulating the input polarization with a continuously rotating achromatic half wave plate (AHWP). Signal is detected in 1462 independent polarimeters distributed over two focal planes such that both polarization states are detected simultaneously. A superconducting magnetic bearing (SMB) allows smooth rotation of the AHWP with low heat dissipation suitable for a long duration balloon flight. The detectors are read out with a frequency domain multiplexing SQUID system.
EBEX Collaboration
Hubmayr Johannes
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