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The EBEX balloon-borne experiment-gondola, attitude control, and control software

Aboobaker, Asad, Ade, Peter, Araujo, Derek, Aubin, François, Baccigalupi, Carlo, Bao, Chaoyun, Chapman, Daniel, Didier, Joy, Dobbs, Matt, Grainger, Will, Hanany, Shaul, Helson, Kyle, Hillbrand, Seth, Hubmayr, Johannes, Jaffe, Andrew, Johnson, Bradley, Jones, Terry, Klein, Jeff, Korotkov, Andrei, Lee, Adrian, Levinson, Lorne, Limon, Michele, MacDermid, Kevin, Miller, Amber D., Milligan, Michael, Moncelsi, Lorenzo, Pascale, Enzo, Raach, Kate, Reichborn-Kjennerud, Britt, Sagiv, Ilan, Tucker, Carole, Tucker, Gregory S., Westbrook, Benjamin, Young, Karl and Zilic, Kyle 2018. The EBEX balloon-borne experiment-gondola, attitude control, and control software. Astrophysical Journal Supplement 239 (1) , p. 9. 10.3847/1538-4365/aae435

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The E and B Experiment (EBEX) was a long-duration balloon-borne instrument designed 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 discuss 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 present flight performance data showing 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.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Publisher: American Astronomical Society
ISSN: 0067-0049
Date of First Compliant Deposit: 20 December 2018
Date of Acceptance: 27 March 2018
Last Modified: 28 Feb 2019 22:20

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