First Supra-THz Heterodyne Array Receivers for Astronomy With the SOFIA Observatory

作者：Risacher Christophe^*; Guesten Rolf; Stutzki Juergen; Huebers Heinz Wilhelm; Buechel Denis; Graf Urs U; Heyminck Stefan; Honingh Cornelia E; Jacobs Karl; Klein Bernd; Klein Thomas; Leinz Christian; Puetz Patrick; Reyes Nicolas; Ricken Oliver; Wunsch Hans Joachim; Fusco Paul; Rosner Stefan

来源：IEEE Transactions on Terahertz Science and Technology, 2016, 6(2): 199-211.

DOI：10.1109/TTHZ.2015.2508005

• Cryogenics
• far-infrared astronomy
• HEB mixer
• heterodyne
• receivers
• submillimeter-wave technology
• superconducting devices

We present the upGREAT THz heterodyne arrays for far-infrared astronomy. The low-frequency array (LFA) is designed to cover the 1.9-2.5 THz range using 2 7-pixel wave-guide-based HEB mixer arrays in a dual polarization configuration. The high-frequency array (HFA) will perform observations of the [OI] line at 4.745 THz using a 7-pixel waveguide-based HEB mixer array. This paper describes the common design for both arrays, cooled to 4.5 K using closed-cycle pulse tube technology. We then show the laboratory and telescope characterization of the first array with its 14 pixels (LFA), which culminated in the successful commissioning in May 2015 aboard the SOFIA airborne observatory observing the [CII] fine structure transition at 1.9005 THz. This is the first successful demonstration of astronomical observations with a heterodyne focal plane array above 1 THz and is also the first time high-power closed-cycle coolers for temperatures below 4.5 K are operated on an airborne platform.

• 出版日期2016-3