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Further optimization of the APEX-SZ TES bolometer array

Westbrook, B., Ade, Peter A. R., Bender, A. N., Cho, H. M., Clarke, J., Dobbs, M., Ferrusca, D., Halverson, N. W., Holzapfel, W. L., Johnson, B. R., Kennedy, J., Kermish, Z., Lanting, T., Lee, A. T., Lueker, M., Mehl, J., Meng, X., Plagge, T., Reichardt, C. L., Richards, P. L., Schwan, D., Shirokoff, E., Spieler, H., Young, Betty, Cabrera, Blas and Miller, Aaron 2009. Further optimization of the APEX-SZ TES bolometer array. Presented at: The Thirteenth International Workshop On Low Temperature Detectors—LTD13, Stanford, CA., 20-24 July 2009. AIP Conf. Proc. American Institute of Physics, pp. 363-366. 10.1063/1.3292353

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We describe the recent reoptimization of the detector array in the APEX‐SZ receiver, which is currently operating at the APEX telescope in Chile. APEX‐SZ is designed to image the Sunyaev Zel’dovich effect (SZE). Observations are made in a single spectral band centered on 150 GHz, which is where the decrement of the SZE peaks. The APEX‐SZ transition‐edge sensor bolometers are micro‐fabricated in six 55‐element sub arrays, which combine to form the full 330‐element focal plane operating at 280 mK. We report on the newest generation of sub‐arrays that use a λ∕4 silicon‐filled backshort. Compared to the first generation array which used a 3λ∕4 backshort, the new arrays have a broader bandwidth and an increased optical efficiency. We present spectral bandpass and efficiency measurements and compare these to electromagnetic simulations of the bolometer absorption. The overall improvement in optical coupling reduces the noise equivalent temperature (NET) of each bolometer by a factor of approximately 1.5. Several galaxy clusters have been observed using the new detectors and analysis of the data is currently underway. We also present plans for future upgrades to the receiver

Item Type: Conference or Workshop Item (Paper)
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QC Physics
Publisher: American Institute of Physics
ISSN: 0094243X
Last Modified: 04 Jun 2017 04:11

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