Journal
MILLIMETER, SUBMILLIMETER, AND FAR-INFRARED DETECTORS AND INSTRUMENTATION FOR ASTRONOMY IX
Volume 10708, Issue -, Pages -Publisher
SPIE-INT SOC OPTICAL ENGINEERING
DOI: 10.1117/12.2311812
Keywords
CMB Polarization; CLASS; Bolometer; Transition-Edge Sensor
Funding
- National Science Foundation Division of Astronomical Sciences [0959349, 1429236, 1636634, 1654494]
- NASA [NNX14AB76A]
- NASA Space Technology Research Fellowship [NXX14AM49H]
- NSF Astronomy and Astrophysics Postdoctoral Fellowship
- Comision Nacional de Investigacion Cientfica y Tecnologica de Chile (CONICYT)
- NASA
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [1636634, 1654494] Funding Source: National Science Foundation
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [959349, 1429236] Funding Source: National Science Foundation
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The Cosmology Large Angular Scale Surveyor (CLASS) aims to detect and characterize the primordial B-mode 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 root s.
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