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Invited Article: Millimeter-wave bolometer array receiver for the Atacama pathfinder experiment Sunyaev-Zel'dovich (APEX-SZ) instrument

D. Schwan ; P. A. R. Ade ; K. Basu ; A. N. Bender ; F. Bertoldi ; H. M. Cho ; G. Chon ; J. Clarke ; M. Dobbs ; D. Ferrusca ; R. Gusten ; N. W. Halverson ; W. L. Holzapfel ; Cathy Horellou (Institutionen för rymd- och geovetenskap, Radioastronomi och astrofysik) ; Daniel Johansson (Institutionen för rymd- och geovetenskap, Radioastronomi och astrofysik) ; B. R. Johnson ; J. Kennedy ; Z. Kermish ; R. Kneissl ; T. Lanting ; A. T. Lee ; M. Lueker ; J. Mehl ; K. M. Menten ; D. Muders ; F. Pacaud ; T. Plagge ; C. L. Reichardt ; P. L. Richards ; R. Schaaf ; P. Schilke ; M. W. Sommer ; H. Spieler ; C. Tucker ; A. Weiss ; B. Westbrook ; O. Zahn ; P. Soc Photo Optical V. Bin F
Review of Scientific Instruments (0034-6748). Vol. 82 (2011), 9,
[Artikel, refereegranskad vetenskaplig]

The Atacama pathfinder experiment Sunyaev-Zel'dovich (APEX-SZ) instrument is a millimeter-wave cryogenic receiver designed to observe galaxy clusters via the Sunyaev-Zel'dovich effect from the 12 m APEX telescope on the Atacama plateau in Chile. The receiver contains a focal plane of 280 superconducting transition-edge sensor (TES) bolometers instrumented with a frequency-domain multiplexed readout system. The bolometers are cooled to 280 mK via a three-stage helium sorption refrigerator and a mechanical pulse-tube cooler. Three warm mirrors, two 4 K lenses, and a horn array couple the TES bolometers to the telescope. APEX-SZ observes in a single frequency band at 150 GHz with 1' angular resolution and a 22' field-of-view, all well suited for cluster mapping. The APEX-SZ receiver has played a key role in the introduction of several new technologies including TES bolometers, the frequency-domain multiplexed readout, and the use of a pulse-tube cooler with bolometers. As a result of these new technologies, the instrument has a higher instantaneous sensitivity and covers a larger field-of-view than earlier generations of Sunyaev-Zel'dovich instruments. The TES bolometers have a median sensitivity of 890 mu K(CMB)root s (NEy of 3.5 x 10(-4) root s). We have also demonstrated upgraded detectors with improved sensitivity of 530 mu K(CMB) root s (NEy of 2.2 x 10(-4) root s). Since its commissioning in April 2007, APEX-SZ has been used to map 48 clusters. We describe the design of the receiver and its performance when installed on the APEX telescope.

Nyckelord: astronomical telescopes, bolometers, clusters of galaxies, cosmology, cryogenics, focal planes, frequency-domain analysis, millimetre wave, receivers, sorption, south-pole telescope, 225-ghz atmospheric opacity, cosmology telescope, electrothermal feedback, galaxy clusters, series array, wavelength, camera, fluctuations, temperature



Denna post skapades 2011-11-17. Senast ändrad 2014-09-02.
CPL Pubid: 148616

 

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