"JOURNAL OF RADIO ELECTRONICS"  N 6, 2015

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Thermal stability of superconducting high sensitive THz receivers

 

E. Baranov 1, O. Bolshakov 1,2, V. Vdovin 1,2, A. Eliseev 1, D. Korotaev 1, V. Koshelets 3, I. Lesnov 1,2, A. Mukhin 1,2, M. Torgashin 3

1 Institute of Applied Physics of RAS

2 Nizhny Novgorod State Technical University n.a. R.E. Alekseev, 

3 Kotelínikov Institute of Radio Engineering and Electronics of RAS

 

The paper is received on May 26, 2015 

 

Abstract. Temperature fluctuations of the current of superconducting THz mixer and temperature instability of a cold head of closed cycle pulse tube helium refrigerator† have been investigated. Spectrum of periodic temperature pulsations with characteristic frequencies cyclically operating cooler have been studied. Theoretical and experimental smoothing techniques of temperature fluctuations and evaluated the efficacy of passive inertial method have been developed. As a result of the proposed package of measures the degree of influence of the cooling mode DC-cooled mixer is reduced ~ 20 times. Some technical solutions for development of high sensitive superconducting THz receivers with mechanical coolers have been formulated.

Key words: THz waves, superconducting receivers, cryogenics, refrigerators, thermal stabilization, space telescope.