Development of MKIDs for measurement of the Cosmic Microwave Background with the South Pole Telescope

Abstract

We present details of the design, simulation, and initial test results of prototype detectors for the fourth-generation receiver of the South Pole Telescope (SPT). Optimized for the detection of key secondary anisotropies of the cosmic microwave background (CMB), SPT-3G+ will measure the temperature and polarization of the mm/sub-mm sky at 220, 285, and 345 GHz, beyond the peak of the CMB blackbody spectrum. The SPT-3G+ focal plane will be populated with microwave kinetic inductance detectors (MKIDs), allowing for significantly increased detector density with reduced cryogenic complexity. We present simulation-backed designs for single-color dual-polarization MKID pixels at each SPT-3G+ observation frequency. We further describe design choices made to promote resonator quality and uniformity, enabling us to maximize the available readout bandwidth. We also discuss aspects of the fabrication process that enable rapid production of these devices and present an initial dark characterization of a series of prototype devices.

8 pages, 5 figures, submitted to the 19th International Workshop on Low Temperature Detectors (LTD19) Proceedings

References in corpus (4)

• Measurements of the E-Mode Polarization and Temperature-E-Mode Correlation of the CMB from SPT-3G 2018 Data
• The Next Generation BLAST Experiment
• Equivalence of Optical and Electrical Noise Equivalent Power of Hybrid NbTiN-Al Microwave Kinetic Inductance Detectors
• Cosmology with Rayleigh Scattering of the Cosmic Microwave Background

Cited by in corpus (9)

• Suitability of Magnetic Microbolometers based on Paramagnetic Temperature Sensors for CMB Polarization Measurements
• RF-ICE: large-scale gigahertz readout of frequency-multiplexed microwave kinetic inductance detectors
• Characterization of MKIDs for CMB observation at 220 GHz with the South Pole Telescope
• Noise Optimization for MKIDs with Different Design Geometries and Material Selections
• Fabrication Development for SPT-SLIM, a Superconducting Spectrometer for Line Intensity Mapping
• Development of an MKID frequency-to-pixel LED mapper for SPT-3G+
• Design of SPT-SLIM focal plane; a spectroscopic imaging array for the South Pole Telescope
• Repurposing ROACH-1 boards for prototyping of readout systems for optical-NIR MKIDs
• Effects of the thin-film thickness on superconducting NbTi microwave resonators for on-chip cryogenic thermometry