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APEX-SZ first light and instrument status |
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| Authors: | M Dobbs NW Halverson PAR Ade K Basu A Beelen F Bertoldi C Cohalan HM Cho R Güsten WL Holzapfel Z Kermish R Kneissl A Kovcs E Kreysa TM Lanting AT Lee M Lueker J Mehl KM Menten D Muders M Nord T Plagge PL Richards P Schilke D Schwan H Spieler A Weiss M White |
| Institution: | aArgelander Institute for Astronomy, University of Bonn, Bonn, Germany;bUniversity of California, Berkeley, CA, United States;cCardiff University, Wales, UK;dUniversity of Colorado, Boulder, CO, United States;eLawrence Berkeley National Laboratory, Berkeley, CA, United States;fMax Planck Institute for Radio Astronomy, Bonn, Germany;gMcGill University, Montréal, Canada |
| Abstract: | The apex-sz instrument is designed for the discovery and study of galaxy clusters at mm-wavelengths using the Sunyaev Zel’dovich effect. The receiver consists of 320 superconducting transition edge sensor (TES) bolometers cooled to 250 mK with the combination of a three stage He sorption fridge and mechanical pulse tube cooler. The detectors are instrumented with a frequency domain multiplexing readout system. The receiver is mounted on the 12 m apex telescope located at 5100 m on the Atacama plateau in Chile. For the first light engineering deployment of December 2005, the receiver was configured with a 55 element wedge of the bolometers and operating in the 150 GHz atmospheric window. During the engineering run we achieved significant milestones in our instrumentation development efforts, including celestial observations with a monolithically fabricated TES bolometer array cooled with a mechanical cooler and successful implementation of a SQUID-based MHz AC-biased readout. These technology demonstrations point the way toward future large TES bolometer array instruments. Here we describe the results of this deployment and future plans for the apex-sz instrument. |
| Keywords: | Cosmology Observations Galaxies Clusters |
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