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Title: The EBEX Balloon-borne Experiment—Detectors and Readout

Journal Article · · The Astrophysical Journal. Supplement Series (Online)
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EBEX was a long-duration balloon-borne experiment to measure the polarization of the cosmic microwave background. The experiment had three frequency bands centered at 150, 250, and 410 GHz and was the first to use a kilopixel array of transition edge sensor bolometers aboard a balloon platform. We determine the design and characterization of the array and the readout system. From the lowest to highest frequency, the median measured detectors' average thermal conductances were 39, 53, and 63 pW/K, the medians of transition temperatures were 0.45, 0.48, and 0.47 K, and the medians of normal resistances were 1.9, 1.5, and 1.4 Ω; moreover, we give the measured distributions. With the exception of the thermal conductance at 150 GHz, all measured values are within 30% of their design. We measure median low-loop-gain time constants τ 0 = 88, 46, and 57 ms. Two measurements of bolometer absorption efficiency gave results consistent within 10% and showing high (~0.9) efficiency at 150 GHz and medium (~0.35 and ~0.25) efficiency at the two higher bands. We calculate a median total optical power absorbed of 3.6, 5.3, and 5.0 pW. EBEX pioneered the use of the digital version of the frequency domain multiplexing system. We multiplexed the bias and readout of 16 bolometers onto two wires. The median per-detector noise-equivalent temperatures are 400, 920, and 14,500 $$\mu {{\rm{K}}}_{{\rm{cmb}}}\sqrt{{\rm{s}}}$$. We compare these values to our preflight predictions and to a previous balloon payload. We report on the sources of excess noise and the path for a future payload to make full use of the balloon environment.

Research Organization:
Lawrence Berkeley National Laboratory (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:
1544089
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: 13 works
Citation information provided by
Web of Science

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Cited By (9)

Development and Testing of the FDM Read-Out of the TES Arrays Aboard the LSPE/SWIPE Balloon-Borne Experiment journal March 2020
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—Gondola, Attitude Control, and Control Software journal November 2018
The EBEX Balloon-Borne Experiment - Gondola, Attitude Control, and Control Software text January 2017
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
Superconducting On-chip Fourier Transform Spectrometer journal June 2020

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