A 279 381 ghz sis receiver for the apex telescope
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A 279 381 ghz sis receiver for the apex telescope

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



First light receiver with closed cycle machine

230 GHz channel

345 GHz channel

Outside part of cryostat

Inner part of cryostat


Signal from input window

Active mirror

4-8 GHz LNA

Flat mirror

Mixer block


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



Toptics  12 K

Apex band 2

Loptics  5%

TIF 10-20 K

Gmix  0 - 3 dB

Tmix 10 K