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Title: The EBEX Balloon-borne Experiment—Gondola, Attitude Control, and Control Software

Journal Article · · The Astrophysical Journal. Supplement Series (Online)
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The E and B Experiment (EBEX) was a long-duration balloon-borne instrument created to measure the polarization of the cosmic microwave background (CMB) radiation. EBEX was the first balloon-borne instrument to implement a kilopixel array of transition edge sensor (TES) bolometric detectors and the first CMB experiment to use the digital version of the frequency domain multiplexing system for readout of the TES array. The scan strategy relied on 40 s peak-to-peak constant-velocity azimuthal scans. We report on the unique demands on the design and operation of the payload that resulted from these new technologies and the scan strategy. We describe the solutions implemented, including the development of a power system designed to provide a total of at least 2.3 kW, a cooling system to dissipate 590 W consumed by the detectors' readout system, software to manage and handle the data of the kilopixel array, and specialized attitude reconstruction software. We demonstrate flight performance data reflecting faultless management of the TES array, adequate powering and cooling of the readout electronics, and constraint of attitude reconstruction errors such that the spurious B-modes they induced were less than 10% of the CMB B-mode power spectrum with r = 0.05.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)
Sponsoring Organization:
USDOE; NASA; National Science Foundation (NSF)
Contributing Organization:
The EBEX Collaboration
OSTI ID:
1544088
Journal Information:
The Astrophysical Journal. Supplement Series (Online), Journal Name: The Astrophysical Journal. Supplement Series (Online) Journal Issue: 1 Vol. 239; ISSN 1538-4365
Publisher:
American Astronomical Society/IOPCopyright Statement
Country of Publication:
United States
Language:
English

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The EBEX Balloon-borne Experiment—Detectors and Readout journal November 2018
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The performance of the bolometer array and readout system during the 2012/2013 flight of the E and B experiment (EBEX) text January 2014
A Joint Analysis of BICEP2/Keck Array and Planck Data text January 2015
The EBEX Balloon Borne Experiment - Optics, Receiver, and Polarimetry text January 2017
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Cited By (7)

CMB-S4 Technology Book, First Edition preprint January 2017
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—Optics, Receiver, and Polarimetry journal November 2018
The EBEX Balloon-borne Experiment—Detectors and Readout journal November 2018
The EBEX Balloon Borne Experiment - Optics, Receiver, and Polarimetry text January 2017
Intensity-Coupled-Polarization in Instruments with a Continuously Rotating Half-Wave Plate text January 2017

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