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A 279-381 GHz SIS receiver for the APEX telescope

A 279-381 GHz SIS receiver for the APEX telescope.

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A 279-381 GHz SIS receiver for the APEX telescope

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  1. A 279-381 GHz SIS receiver for the APEX telescope C. Risacher1, V. Belitsky1, I. Lapkin2, R. R. Monje1, V. Vassilev1, M . Pantaleev1, A. Pavolotsky1, K.-Å Johansson1, L. G. Gunnarsson1, M. Svensson1, M. Fredrixon1, E. Sundin1, V. P. Robles1, D. Medelin, M.Hagström 1, R. Booth 1 1 Group for Advanced Receiver Development (GARD), Radio & Space Science Department with Onsala Space Observatory, Chalmers University of Technology, Gothenburg, Sweden 2 Institute of Applied Physics, Russian Academy of Sciences 46 Ulyanov str.,603950 Nizhny Novgorod, Russia

  2. APEX receivers: Heterodyne Instrumentation

  3. First light receiver with closed cycle machine 230 GHz channel 345 GHz channel Outside part of cryostat Inner part of cryostat

  4. Signal from input window Active mirror 4-8 GHz LNA Flat mirror Mixer block

  5. Laboratory test cryostat with liquid helium 4-8 GHz IF LNA 4-8 GHz Isolator 3 mm Teflon window with circular corrugations Cold teflon lens 200 mm Zitex IR filter Mixer block

  6. Mixer block description

  7. Toptics  12 K Apex band 2 Loptics  5% TIF 10-20 K Gmix  0 - 3 dB Tmix 10 K

  8. 0 mA coil current : Strong DC Josephson effect

  9. 12.5 mA coil current : DC Josephson effect suppressed

  10. With LO power applied

  11. Control system

  12. Cooling system

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