ISSTT Proceedings

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Optics Design of the Multi-color TES Bolometer Camera for the ASTE Telescope

Authors:
Tatsuya Takekoshi, Tetsuhiro Minamidani, Shunichi Nakatsubo, Tai Oshima, Masayuki Kawamura, Hiroshi Matsuo, Tatsuhiro Sato, Nils W. Halverson, Adrian T. Lee, William L. Holzapfel, Yoichi Tamura, Akihiko Hirota, Kenta Suzuki, Takuma Izumi, Kazuo Sorai, Kotaro Kohno, Ryohei Kawabe
Abstract:
Wideband and high spatial resolution continuum observations in the millimeter and submillimeter wavelengths are of great importance to understand star formation history of galaxies from distant to nearby (early to recent universe), and thermal and non-thermal aspects of clusters of galaxies through Sunyaev-Zel’dovich effect. To promote such studies based on the millimeter and submillimeter continuum data, new TES (Transition Edge Sensor) bolometer camera for the ASTE telescope has been developed. We aim to observe three bands, 1100m, 850µm and 450µm. Camera optics is designed by geometrical optics to fit into the Cassegrain system of the ASTE telescope and the spatial limitation of its receiver cabin. For the efficient observation, our optics realizes 7.5’ field of view and 2-band simultaneous observation. The two focal planes can accommodate two of three TES bolometer wafers which have 169, 271, and 881 pixels at 1100, 850, and 450µm, respectively. The camera optics is accomplished diffraction limited optics, which is confirmed from spot diagrams and strehl ratios. It is evaluated via physical optics calculation, and all pixels on each focal plane have aperture efficiency ~30% in absence of reflection and absorption loss by filters and the Ruze loss. The dimensions of the optical elements are also determined based on the results of the physical optics calculations.
Categories:
Poster Session, Miscellaneous
Year:
2012
Session:
P
Full-text:
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Page Number(s):
162-165