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Title: The EBEX Balloon-borne Experiment—Optics, Receiver, and Polarimetry

Journal Article · · The Astrophysical Journal. Supplement Series (Online)
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The E and B Experiment (EBEX) was a long-duration balloon-borne cosmic microwave background (CMB) polarimeter that flew over Antarctica in 2012. We describe the experiment's optical system, receiver, and polarimetric method and discuss their in-flight performance. EBEX had three frequency bands centered on 150, 250, and 410 GHz. To make effective use of limited mass and space, we created a 115 cm2 sr high-throughput optical system that had two ambient temperature mirrors and four antireflection-coated polyethylene lenses per focal plane. All frequency bands shared the same optical train. Polarimetry was achieved with a continuously rotating achromatic half-wave plate (AHWP) that was levitated with a superconducting magnetic bearing (SMB). This is the first use of an SMB in astrophysics. Rotation stability was 0.45% over a period of 10 hr, and angular position accuracy was 0$$^{°}_{.}$$1. The measured modulation efficiency was above 90% for all bands. To our knowledge the 109% fractional bandwidth of the AHWP was the broadest implemented to date. The receiver, composed of one lens and the AHWP at a temperature of 4 K, the polarizing grid and other lenses at 1 K, and the two focal planes at 0.25 K, performed according to specifications, giving focal plane temperature stability with a fluctuation power spectrum that had a 1/f knee at 2 mHz. EBEX was the first balloon-borne instrument to implement technologies characteristic of modern CMB polarimeters, including high-throughput optical systems, and large arrays of transition edge sensor bolometric detectors with multiplexed readouts.

Research Organization:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)
Sponsoring Organization:
USDOE; National Aeronautics and Space Administration (NASA); National Science Foundation (NSF)
Contributing Organization:
The EBEX Collaboration
OSTI ID:
1544087
Journal Information:
The Astrophysical Journal. Supplement Series (Online), Vol. 239, Issue 1; ISSN 1538-4365
Publisher:
American Astronomical Society/IOPCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 18 works
Citation information provided by
Web of Science

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Cited By (7)

Systematic effects induced by half-wave plate precession into measurements of the cosmic microwave background polarization journal July 2019
Balloon-borne Cosmic Microwave Background experiments journal January 2019
Intensity-coupled Polarization in Instruments with a Continuously Rotating Half-wave Plate journal May 2019
The EBEX Balloon-borne Experiment—Gondola, Attitude Control, and Control Software journal November 2018
The EBEX Balloon-borne Experiment—Detectors and Readout journal November 2018
The EBEX Balloon-Borne Experiment - Gondola, Attitude Control, and Control Software text January 2017
Intensity-Coupled-Polarization in Instruments with a Continuously Rotating Half-Wave Plate text January 2017

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