Optimization of Transition Edge Sensor Arrays for Cosmic Microwave Background Observations With the South Pole Telescope

• Published in: IEEE Transactions on Applied Superconductivity
• Main Authors: Ding, Junjia, Ade, P. R., Anderson, A. J., Avva, J., Ahmed, Z., Arnold, K., Austermann, J. E., Bender, A. N., Benson, B. A., Bleem, L. E., Byrum, K., Carlstrom, J. E., Carter, F. W., Chang, C. L., Cho, H. M., Cliche, J. F., Cukierman, A., Czaplewski, D., Divan, R., de Haan, T., Dobbs, M. A., Dutcher, D., Everett, W., Gilbert, A., Gannon, R., Guyser, R., Halverson, N. W., Harrington, N. L., Hattori, K., Henning, J. W., Hilton, G. C., Holzapfel, W. L., Hubmayr, J., Huang, N., Irwin, K. D., Jeong, O., Khaire, T., Kubik, D., Kuo, C. L., Lee, A. T., Leitch, E. M., Meyer, S. S., Miller, C. S., Montgomery, J., Nadolski, A., Natoli, T., Nguyen, H., Novosad, V., Padin, S., Pan, Z., Pearson, J., Posada, C. M., Rahlin, A., Reichardt, C. L., Ruhl, J. E., Saliwanchik, B. R., Sayre, J. T., Shariff, J. A., Shirley, I., Shirokoff, E., Smecher, G., Sobrin, J., Stan, L., Stark, A. A., Story, K., Suzuki, A., Tang, Q. Y., Thakur, R. B., Thompson, K. L., Tucker, C., Vanderlinde, K., Vieira, J. D., Wang, G., Whitehorn, N., Wu, W. K., Yefremenko, V., Yoon, K. W.
• Language: unknown
• Published: 2022
• Subjects: South Pole; South pole
• Online Access: http://www.osti.gov/servlets/purl/1767026; https://www.osti.gov/biblio/1767026; https://doi.org/10.1109/tasc.2016.2639378

In this paper, we describe the optimization of transition-edge-sensor (TES) detector arrays for the third-generation camera for the South Pole Telescope. The camera, which contains ~16 000 detectors, will make high-angular-resolution maps of the temperature and polarization of the cosmic microwave background. Our key results are scatter in the transition temperature of Ti/Au TESs is reduced by fabricating the TESs on a thin Ti(5 nm)/Au(5 nm) buffer layer and the thermal conductivity of the legs that support our detector islands is dominated by the SiOx dielectric in the microstrip transmission lines that run along the legs.