The Advanced ACTPol (AdvACT) upgrade to the Atacama Cosmology Telescope (ACT) features arrays of aluminum manganese transition-edge sensors (TESes) optimized for ground-based observations of the Cosmic Microwave Background (CMB). Array testing shows highly responsive detectors with anticipated in-band noise performance under optical loading. We report on TES parameters measured with impedance data taken on a subset of TESes. We then compare modeled noise spectral densities to measurements. We find excess noise at frequencies around 100 Hz, nearly outside of the signal band of CMB measurements. In addition, we describe full-array noise measurements in the laboratory and in the field for two new AdvACT mid-frequency arrays, sensitive at bands centered on 90 and 150 GHz, and data for the high-frequency array (150/230 GHz) as deployed.
@article{arxiv.1807.07496,
title = {Advanced ACTPol TES Device Parameters and Noise Performance in Fielded Arrays},
author = {Kevin T. Crowley and Jason E. Austermann and Steve K. Choi and Shannon M. Duff and Patricio A. Gallardo and Shuay-Pwu Patty Ho and Johannes Hubmayr and Brian J. Koopman and Federico Nati and Michael D. Niemack and Maria Salatino and Sara M. Simon and Suzanne T. Staggs and Jason R. Stevens and Joel N. Ullom and Eve M. Vavagiakis and Edward J. Wollack},
journal= {arXiv preprint arXiv:1807.07496},
year = {2018}
}
Comments
Accepted for publication in Journal of Low Temperature Physics for LTD-17 special issue