تقرير
The upGREAT dual frequency heterodyne arrays for SOFIA
| العنوان: | The upGREAT dual frequency heterodyne arrays for SOFIA |
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| المؤلفون: | Risacher, C., Güsten, R., Stutzk, J., Hübers, H. -W., Aladro, R., Bell, A., Buchbender, C., Büchel, D., Csengeri, T., Duran, C., Graf, U. U., Higgins, R. D., Honingh, C. E., Jacobs, K., Justen, M., Klein, B., Mertens, M., Okada, Y., Parikka, A., Pütz, P., Reyes, N., Richter, H., Ricken, O., Riquelme, D., Rothbart, N., Schneider, N., Simon, R., Wienold, M., Wiesemeyer, H., Ziebart, M., Fusco, P., Rosner, S., Wohler, B. |
| سنة النشر: | 2018 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - Instrumentation and Methods for Astrophysics |
| الوصف: | 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 > 10^7) 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 2x7 pixels (dual polarization), and presently covers the 1.83-2.06 THz frequency range, which allows to observe the [CII] and [OI] lines at 158 um and 145 um wavelengths. The high frequency array (HFA) covers the [OI] line at 63 um 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 4.7 THz 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. Comment: Accepted to the Journal of Astronomical Instrumentation (SOFIA Special Edition) on 12th November 2018 |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1142/S2251171718400147 |
| URL الوصول: | http://arxiv.org/abs/1812.07403 |
| رقم الأكسشن: | edsarx.1812.07403 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1142/S2251171718400147 |
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