Design and validation of a cold load for characterization of CMB-S4 detectors

Cesiley L. King; Ian Gullett; Adam J. Anderson; Bradford A. Benson; Rick Bihary; Haichen Fan; Johanna M. Nagy; Hogan Nguyen; John E. Ruhl; Sara M. Simon

doi:10.1117/12.3018159

16 August 2024 Design and validation of a cold load for characterization of CMB-S4 detectors

Cesiley L. King, Ian Gullett, Adam J. Anderson, Bradford A. Benson, Rick Bihary, Haichen Fan, Johanna M. Nagy, Hogan Nguyen, John E. Ruhl, Sara M. Simon

Author Affiliations +

Proceedings Volume 13102, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy XII; 1310218 (2024) https://doi.org/10.1117/12.3018159
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Conference Poster

Abstract

We present the design and validation of a variable temperature cryogenic blackbody source, hereinafter called a cold load, that will be used to characterize detectors to be deployed by CMB-S4, the next-generation ground-based cosmic microwave background (CMB) experiment. Although cold loads have been used for detector characterization by previous CMB experiments, this cold load has three novel design features: (1) the ability to operate from the 1 K stage of a dilution refrigerator (DR), (2) a ³He gas-gap heat switch to reduce cooling time, and (3) the ability to couple small external optical signals to measure detector optical time constants under low optical loading. The efficacy of this design was validated using a 150 GHz detector array previously deployed by the Spider experiment. Thermal tests showed that the cold load can be heated to temperatures required for characterizing CMB-S4’s detectors without significantly impacting the temperatures of other cryogenic stages when mounted to the DR’s 1 K stage. Additionally, optical tests demonstrated that external signals can be coupled to a detector array through the cold load without imparting a significant optical load on the detectors, which will enable measurements of the CMB-S4 detectors’ optical time constants.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

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Cesiley L. King, Ian Gullett, Adam J. Anderson, Bradford A. Benson, Rick Bihary, Haichen Fan, Johanna M. Nagy, Hogan Nguyen, John E. Ruhl, and Sara M. Simon "Design and validation of a cold load for characterization of CMB-S4 detectors", Proc. SPIE 13102, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy XII, 1310218 (16 August 2024); https://doi.org/10.1117/12.3018159

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