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Thermal and optical characterization for POLARBEAR-2 optical system

Inoue, Y., Ade, Peter A. R., Stebor, N., Akiba, Y., Arnold, K., Anthony, A. E., Atlas, M., Barron, D., Bender, A., Boettger, D., Borrilll, J., Chapman, S., Chinone, Y., Cukierman, A., Dobbs, M., Elleflot, T., Errard, J., Fabbian, G., Feng, C., Gilbert, A., Halverson, N. W., Hasegawa, M., Hattori, K., Hazumi, M., Holzapfel, W. L., Hori, Y., Jaehnig, G. C., Jaffe, A. H., Katayama, N., Keating, B., Kermish, Z., Keskitalo, Reijo, Kisner, T., Le Jeune, M., Lee, A. T., Leitch, E. M., Linder, E., Matsuda, F., Matsumura, T., Meng, X., Morii, H., Myers, M. J., Navaroli, M., Nishino, H., Okamura, T., Paar, H., Peloton, J., Poletti, D., Rebeiz, G., Reichardt, C. L., Richards, P. L., Ross, C., Schenck, D. E., Sherwin, B. D., Siritanasak, P., Smecher, G., Sholl, M., Steinbach, B., Stompor, R., Suzuki, A., Suzuki, J., Takada, S., Takakura, S., Tomaru, T., Wilson, B., Yadav, A., Yamaguchi, H. and Zahn, O. 2014. Thermal and optical characterization for POLARBEAR-2 optical system. Presented at: Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VII, Montréal, Quebec, Canada, 22 June 2014. Proc. SPIE 9153,. Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy , vol. VII. Montréal, Quebec, Canada: SPIE, 91533A. 10.1117/12.2055572

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Abstract

POLARBEAR-2 (PB-2) is a cosmic microwave background (CMB) polarization experiment for B-mode detection. The PB-2 receiver has a large focal plane and aperture that consists of 7588 transition edge sensor (TES) bolometers at 250 mK. The receiver consists of the optical cryostat housing reimaging lenses and infrared filters, and the detector cryostat housing TES bolometers. The large focal plane places substantial requirements on the thermal design of the optical elements at the 4K, 50K, and 300K stages. Infrared filters and lenses inside the optical cryostat are made of alumina for this purpose. We measure basic properties of alumina, such as the index of refraction, loss tangent and thermal conductivity. All results meet our requirements. We also optically characterize filters and lenses made of alumina. Finally, we perform a cooling test of the entire optical cryostat. All measured temperature values satisfy our requirements. In particular, the temperature rise between the center and edge of the alumina infrared filter at 50 K is only 2:0 ± 1:4 K. Based on the measurements, we estimate the incident power to each thermal stage. © (2014) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.

Item Type: Conference or Workshop Item (Paper)
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QC Physics
Uncontrolled Keywords: Apertures ; Bolometers ; Lenses ; Optical components ; Optical filtering; Optical systems; Polarization; Receivers; Refractive index; Sensors
Publisher: SPIE
ISSN: 0277-786X
Last Modified: 04 Jun 2017 08:51
URI: http://orca.cf.ac.uk/id/eprint/86527

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