On-sky performance of new 90 GHz detectors for the Cosmology Large Angular Scale Surveyor (CLASS)
arXiv:2301.01417 · doi:10.1109/TASC.2023.3262497
Abstract
The Cosmology Large Angular Scale Surveyor (CLASS) is a polarization-sensitive telescope array located at an altitude of 5,200 m in the Chilean Atacama Desert and designed to measure the polarized Cosmic Microwave Background (CMB) over large angular scales. The CLASS array is currently observing with three telescopes covering four frequency bands: one at 40 GHz (Q); one at 90 GHz (W1); and one dichroic system at 150/220 GHz (HF). During the austral winter of 2022, we upgraded the first 90 GHz telescope (W1) by replacing four of the seven focal plane modules. These new modules contain detector wafers with an updated design, aimed at improving the optical efficiency and detector stability. We present a description of the design changes and measurements of on-sky optical efficiencies derived from observations of Jupiter.
arXiv comment5 pages, 3 figures, to appear in the IEEE Transactions on Applied Superconductivity. arXiv admin note: text overlap with arXiv:2208.05006
References in corpus (12)
- Nine-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Final Maps and Results
- Seven-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Planets and Celestial Calibration Sources
- CLASS: The Cosmology Large Angular Scale Surveyor
- The Cosmology Large Angular Scale Surveyor
- Four-year Cosmology Large Angular Scale Surveyor (CLASS) Observations: On-sky Receiver Performance at 40, 90, 150, and 220 GHz Frequency Bands
- The CLASS 150/220 GHz Polarimeter Array: Design, Assembly, and Characterization
- On-sky performance of the CLASS Q-band telescope
- Recovery of Large Angular Scale CMB Polarization for Instruments Employing Variable-delay Polarization Modulators
- Calibration of Transition-edge Sensor (TES) Bolometer Arrays with Application to CLASS
- Silicon-Based Antenna-Coupled Polarization-Sensitive Millimeter-Wave Bolometer Arrays for Cosmic Microwave Background Instruments
- Design and characterization of the Cosmology Large Angular Scale Surveyor (CLASS) 93 GHz focal plane
- Cosmology Large Angular Scale Surveyor (CLASS) Focal Plane Development