Computer Science – Performance
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...21111004p&link_type=abstract
American Astronomical Society, AAS Meeting #211, #110.04; Bulletin of the American Astronomical Society, Vol. 39, p.939
Computer Science
Performance
Scientific paper
We report on the status of EBEX, a NASA-funded balloon-borne polarimeter designed to measure the B-mode polarization of the cosmic microwave background radiation. We will set a 2σ upper limit on the inflationary tensor-to-scalar ratio of r ≤ 0.03. This limit assumes a 14-day flight, a scan pattern covering 350 square degrees of the sky, and foreground subtraction to levels below detector noise. The instrument employs a 1.5 meter Gregorian-type telescope and 1472 bolometric transition edge sensor (TES) detectors distributed over two focal planes. Polarimetry is achieved with a rotating achromatic half wave plate (AHWP) and fixed polarizer. The AHWP is continuously rotated with a superconducting magnetic bearing (SMB). Sky signals will be observed in three bands centered at 150, 250 and 410 GHz, providing strong leverage against polarized dust foreground. Construction of the cryostat, gondola, primary and secondary mirrors is complete. Cryogenic testing of detectors and read-outs is underway, along with experiments verifying gondola orientation and pointing performance. A short-duration test flight employing 384 detectors on one focal plane is planned for 2008.
EBEX Collaboration
Polsgrove Daniel
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