High-Efficiency and Low-Noise Detectors for the Upgraded CLASS 90 GHz Focal Plane
Abstrak
We present the in-lab and on-sky performance for the upgraded 90 GHz focal plane of the Cosmology Large Angular Scale Surveyor (CLASS), which had four of its seven detector wafers updated during the austral winter of 2022. The update aimed to improve the transition-edge-sensor (TES) stability and bias range and to realize the high optical efficiency of the sensor design. Modifications included revised circuit terminations, electrical contact between the TES superconductor and the normal metal providing the bulk of the bolometer's heat capacity, and additional filtering on the TES bias lines. The upgrade was successful: 94% of detectors are stable down to 15% of the normal resistance, providing a wide overlapping range of bias voltages for all TESs on a wafer. The median telescope efficiency improved from $0.42^{+0.15}_{-0.22}$ to $0.60^{+0.10}_{-0.32}$ (68% quantiles). For the four upgraded wafers alone, median telescope efficiency increased to $0.65^{+0.06}_{-0.06}$. Given our efficiency estimate for the receiver optics, this telescope efficiency implies a detector efficiency exceeding $0.90$. The overall noise-equivalent temperature of the 90 GHz focal plane improved from 19 $μ$K$\sqrt{s}$ to 9.7 $μ$K$\sqrt{s}$.
Topik & Kata Kunci
Penulis (25)
Carolina Núñez
John W. Appel
Rahul Datta
Charles L. Bennett
Michael K. Brewer
Sarah Marie Bruno
Ricardo Bustos
David T. Chuss
Nick Costen
Jullianna Denes Couto
Sumit Dahal
Kevin L. Denis
Joseph R. Eimer
Thomas Essinger-Hileman
Jeffrey Iuliano
Yunyang Li
Tobias A. Marriage
Jennette Mateo
Matthew A. Petroff
Rui Shi
Karwan Rostem
Deniz A. N. Valle
Duncan Watts
Edward J. Wollack
Lingzhen Zeng
Akses Cepat
- Tahun Terbit
- 2024
- Bahasa
- en
- Sumber Database
- arXiv
- Akses
- Open Access ✓