{"id":2823,"date":"2020-05-31T17:37:29","date_gmt":"2020-05-31T21:37:29","guid":{"rendered":"http:\/\/www.apex-telescope.org\/wordpress\/?page_id=2823"},"modified":"2020-05-31T17:42:44","modified_gmt":"2020-05-31T21:42:44","slug":"shefi","status":"publish","type":"page","link":"https:\/\/www.apex-telescope.org\/ns\/observing\/the-telescope\/instruments\/shefi\/","title":{"rendered":"SHeFI"},"content":{"rendered":"\n

The Swedish Heterodyne Facility Instrument (SHeFI)<\/strong> was built by the GARD group<\/a> at the Chalmers University, Sweden, with the Onsala Space Observatory. The SHeFI consisted of four wide-band heterodyne receiver channels for 230 GHz (APEX-1), 345 GHz (APEX-2), 460 GHz (APEX-3), and 1300 GHz (APEX-T2). All the bands were located inside a single closed-cycle cryostat which maintained the coldest part at a temperature close to 4 K. The first three bands for 230, 345, and 460 GHz employed superconductor-insulator-superconductor (SIS) mixers and behaved as single sideband receivers (SSB). The 1.3 THz band was built using hot electron bolometer (HEB) mixer technology and was a double sideband receiver (DSB).<\/p>\n\n\n\n

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Details of the SHeFI dewar inner structure (GARD team)<\/figcaption><\/figure><\/div>\n\n\n\n
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SHeFI was installed and commissioned during the first quarter of 2008, replacing the APEX-2A receiver. The cryostat was placed in the facility position of the Nasmyth-A Cabin, where it remained for almost a decade as the only facility heterodyne receiver.<\/p>\n\n\n\n

This versatile multi-band instrument was able to cover almost all weather conditions at Chajnantor and, as a facility instrument, has been used by the entire APEX community, from all different partners. To date, SHeFI at APEX has produced more than 200 scientific publications<\/a> covering many different scientific topics. At the end of 2017, SHeFI was finally decommissioned, leaving space for newer instrumentation in the A-cabin.<\/p>\n\n\n\n

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Main reference about SHeFI:<\/p>

V. Vassilev, D. Meledin, I. Lapkin, V. Belitsky, O. Nystr\u00f6m, D. Henke, A. Pavolotsky, R. Monje, C. Risacher, M. Olberg, M. Strandberg, E. Sundin, M. Fredrixon, S.-E. Ferm, V. Desmaris, D. Dochev, M. Pantaleev, P. Bergman, and H. Olofsson, \u201dSwedish heterodyne facility instrument for the APEX telescope<\/a>\u201d,\u00a0Astronomy and Astrophysics<\/em>, A&A 490, pp. 1157\u20111163, 2008<\/p><\/blockquote>\n\n\n\n

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To read more detailed information about the SHeFI you can visit:<\/p>\n\n\n\n