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Feedhorn-coupled TES polarimeter camera modules at 150 GHz for CMB polarization measurements with SPTpol

Holland, Wayne S., Henning, J. W., Ade, Peter A. R., Aird, K. A., Austermann, J. E., Beall, J. A., Becker, D., Benson, B. A., Bleem, L. E., Britton, J., Carlstrom, J. E., Chang, C. L., Cho, H.-M., Crawford, T. M., Crites, A. T., Datesman, A., de Haan, T., Dobbs, M A., Everett, W., Ewall-Wice, A., George, E. M., Halverson, N. W., Harrington, N., Hilton, G. C., Holzapfel, W. L., Hubmayr, J., Irwin, K. D., Karfunkle, M., Keisler, R., Kennedy, J., Lee, A. T., Leitch, E., Li, D., Lueker, M., Marrone, D. P., McMahon, J. J., Mehl, J., Meyer, S. S., Montgomery, J., Montroy, T. E., Nagy, J., Natoli, T., Nibarger, J. P., Niemack, M. D., Novosad, V., Padin, S., Pryke, C., Reichardt, C. L., Ruhl, J. E., Saliwanchik, B. R., Sayre, J. T., Schaffer, K. K., Shirokoff, E., Story, K., Tucker, Carole, Vanderlinde, K., Vieira, J. D., Wang, G., Williamson, R., Yefremenko, V., Yoon, K. W. and Young, E. 2012. Feedhorn-coupled TES polarimeter camera modules at 150 GHz for CMB polarization measurements with SPTpol. Presented at: PIE 8452, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VI, Montreal, Canada, 3-6 July 2012. Proc. SPIE 8452, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VI. The International Society for Optical Engineering, 84523A. 10.1117/12.927172

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Abstract

The SPTpol camera is a dichroic polarimetric receiver at 90 and 150 GHz. Deployed in January 2012 on the South Pole Telescope (SPT), SPTpol is looking for faint polarization signals in the Cosmic Microwave Background (CMB). The camera consists of 180 individual Transition Edge Sensor (TES) polarimeters at 90 GHz and seven 84-polarimeter camera modules (a total of 588 polarimeters) at 150 GHz. We present the design, dark characterization, and in-lab optical properties of the 150 GHz camera modules. The modules consist of photolithographed arrays of TES polarimeters coupled to silicon platelet arrays of corrugated feedhorns, both of which are fabricated at NIST-Boulder. In addition to mounting hardware and RF shielding, each module also contains a set of passive readout electronics for digital frequency-domain multiplexing. A single module, therefore, is fully functional as a miniature focal plane and can be tested independently. Across the modules tested before deployment, the detectors average a critical temperature of 478 mK, normal resistance <i>R<sub>N</sub></i> of 1.2&Omega; , unloaded saturation power of 22.5 pW, (detector-only) optical efficiency of ~ 90%, and have electrothermal time constants &lt; 1 ms in transition

Item Type: Conference or Workshop Item (Paper)
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QC Physics
Publisher: The International Society for Optical Engineering
ISSN: 0277-786X
Last Modified: 04 Jun 2017 04:57
URI: http://orca-mwe.cf.ac.uk/id/eprint/46767

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