학술논문
Integrated Electrical Properties of the Frequency Multiplexed Cryogenic Readout System for Polarbear/Simons Array
Document Type
Periodical
Author
Barron, D.; Mitchell, K.; Groh, J.; Arnold, K.; Elleflot, T.; Howe, L.; Ito, J.; Lee, A.T.; Lowry, L.N.; Anderson, A.; Avva, J.; Adkins, T.; Baccigalupi, C.; Cheung, K.; Chinone, Y.; Jeong, O.; Katayama, N.; Keating, B.; Montgomery, J.; Nishino, H.; Raum, C.; Siritanasak, P.; Suzuki, A.; Takatori, S.; Tsai, C.; Westbrook, B.; Zhou, Y.
Source
IEEE Transactions on Applied Superconductivity IEEE Trans. Appl. Supercond. Applied Superconductivity, IEEE Transactions on. 31(5):1-5 Aug, 2021
Subject
Language
ISSN
1051-8223
1558-2515
2378-7074
1558-2515
2378-7074
Abstract
Polarbear/Simons Array is a cosmic microwave background (CMB) polarization experiment, with science goals including a deep search for CMB B-mode polarization created by inflationary gravitational waves, and characterization of the CMB B-mode signal from gravitational lensing. When completed, Simons Array will have over 20,000 superconducting transition-edge sensor bolometers, cooled to 300 mK with closed-cycle cryogenics. This significant increase in detectors and sensitivity is enabled by advancements in frequency multiplexed readout. The detectors are read out with DfMux digital frequency-domain multiplexing, with 40 channels read out by each SQUID array, with frequency channels between 1 and 5 MHz defined by an inductor and capacitor in series with each detector. After the system was completed and characterized for Polarbear-2a, modifications were made that further improved performance for Polarbear-2b. We present the characterization of the integrated cryogenic readout system for Polarbear-2a and Polarbear-2b, and comparison of properties including stray impedance and frequency scatter.