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Opto-mechanical design and performance of a compact three-frequency camera for the Millimeter Bolometer Array Camera on the Atacama Cosmology Telescope

Thornton, R. J., Ade, Peter A. R., Allen, C., Amiri, M., Appel, J. W., Battistelli, E. S., Burger, B., Chervenak, J. A., Devlin, M. J., Dicker, S. R., Doriese, W. B., Essinger-Hileman, T., Fisher, R. P., Fowler, J. W., Halpern, M., Hargrave, Peter Charles, Hasselfield, M., Hilton, G. C., Hincks, A. D., Irwin, K. D., Jarosik, N., Kaul, M., Klein, J., Lau, J. M., Limon, M., Marriage, T. A., Martocci, K. L., Mauskopf, Philip Daniel, Moseley, S. H., Niemack, M. D., Page, L., Parker, L. P., Reidel, J., Reintsema, C. D., Staggs, S. T., Stryzak, O. R., Swetz, D. S., Switzer, E. R., Tucker, Carole, Wollack, E. J. and Zhao, Y. 2008. Opto-mechanical design and performance of a compact three-frequency camera for the Millimeter Bolometer Array Camera on the Atacama Cosmology Telescope. Presented at: Millimeter and submillimeter detectors and instrumentation for astronomy IV, Marseille, France, 26-28 June 2008. Published in: Duncan, William D., Holland, Wayne S., Withington, Stafford and Zmuidzinas, Jonas eds. Proceedings of the Millimeter and Submillimeter Detectors and Instrumentation for Astronomy IV Conference, Marseille, France, 26-28 June 2008. Proceedings of SPIE , vol. 7020. Bellingham, WA: SPIE, 70201R. 10.1117/12.790078

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Abstract

The 6-meter Atacama Cosmology Telescope will map the cosmic microwave background at millimeter wavelengths.The commissioning instrument for the telescope, the Millimeter Bolometer Array Camera, is based on arefractive optical system which simultaneously images three separate fields of view at three different frequencies:145, 220, and 280 GHz. Each frequency band contains around twelve individual optical elements at five differenttemperature stages ranging from 300 K to 300 mK and a 32 x 32 array of Transition Edge Sensor bolometers at300 mK. We discuss the design of the close-packed on-axis optical design of the three frequencies. The thermaldesign and performance of the system are presented in the context of the scientific requirements and observingschedule. A major part of the design was the incorporation of multiple layers of magnetic shielding. We discussthe performance of the 145 GHz optical system in 2007 and the implementation of the additional two frequencychannels in 2008.

Item Type: Conference or Workshop Item (Paper)
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Uncontrolled Keywords: Bolometers ; Cameras ; Equipment and services ; Magnetism ; Multilayers ; Optical components ; Optical design ; Optical systems ; Optomechanical design ; Sensors
Publisher: SPIE
ISBN: 9780819472304
ISSN: 0277786X
Last Modified: 08 Sep 2018 21:36
URI: http://orca-mwe.cf.ac.uk/id/eprint/28379

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