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Publication . Conference object . Preprint . Article . Part of book or chapter of book . 2010

EBEX: a balloon-borne CMB polarization experiment

Britt Reichborn-Kjennerud; Asad M. Aboobaker; Peter A. R. Ade; François Aubin; Carlo Baccigalupi; Chaoyun Bao; Julian Borrill; +39 Authors
Open Access
Published: 29 Jun 2010
Publisher: HAL CCSD

EBEX is a NASA-funded balloon-borne experiment designed to measure the polarization of the cosmic microwave background (CMB). Observations will be made using 1432 transition edge sensor (TES) bolometric detectors read out with frequency multiplexed SQuIDs. EBEX will observe in three frequency bands centered at 150, 250, and 410 GHz, with 768, 384, and 280 detectors in each band, respectively. This broad frequency coverage is designed to provide valuable information about polarized foreground signals from dust. The polarized sky signals will be modulated with an achromatic half wave plate (AHWP) rotating on a superconducting magnetic bearing (SMB) and analyzed with a fixed wire grid polarizer. EBEX will observe a patch covering ~1% of the sky with 8' resolution, allowing for observation of the angular power spectrum from \ell = 20 to 1000. This will allow EBEX to search for both the primordial B-mode signal predicted by inflation and the anticipated lensing B-mode signal. Calculations to predict EBEX constraints on r using expected noise levels show that, for a likelihood centered around zero and with negligible foregrounds, 99% of the area falls below r = 0.035. This value increases by a factor of 1.6 after a process of foreground subtraction. This estimate does not include systematic uncertainties. An engineering flight was launched in June, 2009, from Ft. Sumner, NM, and the long duration science flight in Antarctica is planned for 2011. These proceedings describe the EBEX instrument and the North American engineering flight.

12 pages, 9 figures, Conference proceedings for SPIE Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy V (2010)

Subjects by Vocabulary

arXiv: Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics::Instrumentation and Methods for Astrophysics

Microsoft Academic Graph classification: Astrophysics Radio spectrum Sky media_common.quotation_subject media_common Detector Optics business.industry business Physics Transition edge sensor Spectral density Waveplate Cosmic microwave background Polarization (waves)


[PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], [SDU.ASTR.CO]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], Astrophysics - Cosmology and Nongalactic Astrophysics, Cosmology and Nongalactic Astrophysics (astro-ph.CO), FOS: Physical sciences

[1] Oxley, P. et al., “The EBEX experiment,” Society of Photo-Optical Instrumentation Engineers (SPIE) Conference Series 5543, 320-331 (Nov. 2004).

[2] Grainger, W. et al., “EBEX: the E and B Experiment,” Society of Photo-Optical Instrumentation Engineers (SPIE) Conference Series 7020 (Aug. 2008).

[3] Hubmayr, J. et al., “Design and characterization of TES bolometers and SQUID readout electronics for a balloon-borne application,” Society of Photo-Optical Instrumentation Engineers (SPIE) Conference Series 7020 (Aug. 2008).