TY - JOUR U1 - Zeitschriftenartikel, wissenschaftlich - begutachtet (reviewed) A1 - Risacher, C. A1 - Güsten, R. A1 - Stutzki, J. A1 - Hübers, H.-W. A1 - Aladro, R. A1 - Bell, A. A1 - Buchbender, C. A1 - Büchel, D. A1 - Csengeri, T. A1 - Duran, C. A1 - Graf, U. U. A1 - Higgins, R. D. A1 - Honingh, C. E. A1 - Jacobs, K. A1 - Justen, M. A1 - Klein, B. A1 - Mertens, M. A1 - Okada, Y. A1 - Parikka, A. A1 - Pütz, P. A1 - Reyes, N. A1 - Richter, H. A1 - Ricken, O. A1 - Riquelme, D. A1 - Rothbart, N. A1 - Schneider, N. A1 - Simon, R. A1 - Wienold, M. A1 - Wiesemeyer, H. A1 - Ziebart, M. A1 - Fusco, P. A1 - Rosner, S. A1 - Wohler, B. T1 - The upGREAT Dual Frequency Heterodyne Arrays for SOFIA JF - Journal of Astronomical Instrumentation N2 - We present the performance of the upGREAT heterodyne array receivers on the SOFIA telescope after several years of operations. This instrument is a multi-pixel high resolution (R≳107) spectrometer for the Stratospheric Observatory for Far-Infrared Astronomy (SOFIA). The receivers use 7-pixel subarrays configured in a hexagonal layout around a central pixel. The low frequency array receiver (LFA) has 2×7 pixels (dual polarization), and presently covers the 1.83–2.07THz frequency range, which allows to observe the [CII] and [OI] lines at 158μm and 145μm wavelengths. The high frequency array (HFA) covers the [OI] line at 63μm and is equipped with one polarization at the moment (7 pixels, which can be upgraded in the near future with a second polarization array). The 4.7THz array has successfully flown using two separate quantum-cascade laser local oscillators from two different groups. NASA completed the development, integration and testing of a dual-channel closed-cycle cryocooler system, with two independently operable He compressors, aboard SOFIA in early 2017 and since then, both arrays can be operated in parallel using a frequency separating dichroic mirror. This configuration is now the prime GREAT configuration and has been added to SOFIA’s instrument suite since observing cycle 6. KW - high resolution spectroscopy KW - THz astronomy KW - airborne KW - SOFIA (GREAT) UN - https://nbn-resolving.org/urn:nbn:de:hbz:1044-opus-43319 SN - 2251-1717 SS - 2251-1717 U6 - https://doi.org/10.1142/S2251171718400147 DO - https://doi.org/10.1142/S2251171718400147 AX - 1812.07403 VL - 07 IS - 04 SP - 1840014-1 EP - 1840014-16 PB - World Scientific ER -