Design and characterization of the Cosmology Large Angular Scale Surveyor (CLASS) 93 GHz focal plane
| dc.contributor.author | Dahal, Sumit | |
| dc.contributor.author | Ali, Aamir | |
| dc.contributor.author | Appel, John W. | |
| dc.contributor.author | Essinger-Hileman, Thomas | |
| dc.contributor.author | Helson, Kyle | |
| dc.contributor.author | et al | |
| dc.date.accessioned | 2022-06-24T20:19:28Z | |
| dc.date.available | 2022-06-24T20:19:28Z | |
| dc.date.issued | 2018-07-09 | |
| dc.description | Authors: Sumit Dahal, Aamir Ali, John W. Appel, Thomas Essinger-Hileman, Charles Bennett, Michael Brewer, Ricardo Bustos, Manwei Chan, David T. Chuss, Joseph Cleary, Felipe Colazo, Jullianna Couto, Kevin Denis, Rolando Dünner, Joseph Eimer, Trevor Engelhoven, Pedro Fluxa, Mark Halpern, Kathleen Harrington, Kyle Helson, Gene Hilton, Gary Hinshaw, Johannes Hubmayr, Jeffery Iuliano, John Karakla, Tobias Marriage, Jeffrey McMahon, Nathan Miller, Carolina Nuñez, Ivan Padilla, Gonzalo Palma, Lucas Parker, Matthew Petroff, Bastian Pradenas, Rodrigo Reeves, Carl Reintsema, Karwan Rostem, Marco Sagliocca, Kongpop U-Yen, Deniz Valle, Bingjie Wang, Qinan Wang, Duncan Watts, Janet Weiland, Edward Wollack, Zhilei Xu, Ziang Yan, Lingzhen Zeng | |
| dc.description | SPIE Astronomical Telescopes + Instrumentation, 2018, Austin, Texas, United States | en |
| dc.description.abstract | The Cosmology Large Angular Scale Surveyor (CLASS) aims to detect and characterize the primordial Bmode signal and make a sample-variance-limited measurement of the optical depth to reionization. CLASS is a ground-based, multi-frequency microwave polarimeter that surveys 70% of the microwave sky every day from the Atacama Desert. The focal plane detector arrays of all CLASS telescopes contain smooth-walled feedhorns that couple to transition-edge sensor (TES) bolometers through symmetric planar orthomode transducer (OMT) antennas. These low noise polarization-sensitive detector arrays are fabricated on mono-crystalline silicon wafers to maintain TES uniformity and optimize optical efficiency throughout the wafer. In this paper, we discuss the design and characterization of the first CLASS 93 GHz detector array. We measure the dark parameters, bandpass, and noise spectra of the detectors and report that the detectors are photon-noise limited. With current array yield of 82%, we estimate the total array noise-equivalent power (NEP) to be 2.1 aW√s. | en |
| dc.description.sponsorship | Among the four lead authors of this paper, S. Dahal is a graduate student at JHU who completed the W-band focal plane assembly and detector characterization and installed and verified the detector array at the CLASS telescope site in the Atacama Desert. A. Ali is a postdoctoral researcher at UC Berkeley whose JHU-based PhD dissertation encompassed the bulk of the W-band focal plane development, including assembly, testing of detectors, characterization of CE7, and magnetic shielding design.20 J. W. Appel is an Associate Research Scientist who has overseen all CLASS detector testing, assembly and in-field characterization. T. Essinger-Hileman is a Research Astrophysicist at NASA Goddard who designed the focal plane modules, including the use of CE7 as a silicon interface material. We acknowledge the National Science Foundation Division of Astronomical Sciences for their support of CLASS under Grant Numbers 0959349, 1429236, 1636634, and 1654494. CLASS uses detector technology developed under several previous and ongoing NASA grants. Detector development work at JHU was funded by NASA grant number NNX14AB76A. We are also grateful to NASA for their support of civil servants engaged in state-of-the-art detector technologies. K. Harrington is supported by the NASA Space Technology Research Fellowship grant number NXX14AM49H. T. Essinger-Hileman was supported by an NSF Astronomy and Astrophysics Postdoctoral Fellowship. We further acknowledge the very generous support of Jim and Heather Murren (JHU A&S ’88), Matthew Polk (JHU A&S Physics BS ’71), David Nicholson, and Michael Bloomberg (JHU Engineering ’64). CLASS is located in the Parque Astronomico de Atacama in northern Chile under the auspices of the Comisión Nacional de Investigación Cientlfica y Tecnológica de Chile (CONICYT). | en |
| dc.description.uri | https://www.spiedigitallibrary.org/conference-proceedings-of-spie/10708/107081Y/Design-and-characterization-of-the-Cosmology-Large-Angular-Scale-Surveyor/10.1117/12.2311812.short | en |
| dc.format.extent | 17 pages | en |
| dc.genre | Conference papers and proceedings | en |
| dc.identifier | doi:10.13016/m2rzgj-pz8g | |
| dc.identifier.citation | Sumit Dahal, et al. "Design and characterization of the Cosmology Large Angular Scale Surveyor (CLASS) 93 GHz focal plane," Proc. SPIE 10708, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy IX, 107081Y (9 July 2018); https://doi-org/10.1117/12.2311812 | en |
| dc.identifier.uri | https://doi.org/10.1117/12.2311812 | |
| dc.identifier.uri | http://hdl.handle.net/11603/25041 | |
| dc.language.iso | en | en |
| dc.publisher | SPIE | en |
| dc.relation.isAvailableAt | The University of Maryland, Baltimore County (UMBC) | |
| dc.relation.ispartof | UMBC Center for Space Sciences and Technology | |
| dc.rights | Public Domain Mark 1.0 | * |
| dc.rights | This work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law. | en |
| dc.rights.uri | http://creativecommons.org/publicdomain/mark/1.0/ | * |
| dc.title | Design and characterization of the Cosmology Large Angular Scale Surveyor (CLASS) 93 GHz focal plane | en |
| dc.type | Text | en |
| dcterms.creator | https://orcid.org/0000-0001-9238-4918 | en |