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An Instrumental test observation for 22GHz and 43GHz quasi-optical circuit of KVN receivers

An Instrumental test observation for 22GHz and 43GHz quasi-optical circuit of KVN receivers. Seog-Tae Han, Jung-Won Lee, Jiman Kang, Sang-Sung Lee, Do-young Byun, Do-Heung Je, Moon-Hee Chung, Seog-Oh Wi. March 18 th 2009. Outline. Eevaluation of Quasi-optical circuit for

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An Instrumental test observation for 22GHz and 43GHz quasi-optical circuit of KVN receivers

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  1. An Instrumental test observation for22GHz and 43GHz quasi-opticalcircuit of KVN receivers Seog-Tae Han, Jung-Won Lee, Jiman Kang, Sang-Sung Lee, Do-young Byun, Do-Heung Je, Moon-Hee Chung, Seog-Oh Wi. March 18th 2009

  2. Outline • Eevaluation of Quasi-optical circuitfor • 22GHz and 43GHz bands • - Test observation for quasi-optics circuit • - Summary

  3. Outline(I) Total Quasi-optical Circuit Evaluationfor 22GHz and 43GHz bands

  4. (단위 : 백만원) Quasi-optical circuit for Multi-band receivers

  5. (단위 : 백만원) Summary of the experimental results of LPFs • It took about more than 4years for design and test • Good results to be used quasi-optical components

  6. (단위 : 백만원) 22/43GHz band Quasi-optics circuit for simultaneous observation.

  7. (단위 : 백만원) Beam deviation 22/43GHz for total Q.O circuit Red : 22GHz Green : 43GHz HPBW at Cass. focus @ 43GHz : approx. 30mm @ 22GHz : approx. 60 mm Beam Deviation between two beams : less than 1mm

  8. (단위 : 백만원) Comparison between theoretical and measuredbeam size at cassegrain focus Cass. focus

  9. (단위 : 백만원) Beam radii near Cass. focus at 22GHz (Transmission through LPF2) 49.4mm 47.6mm Without LPF With LPF 2mm (2/50) difference

  10. (단위 : 백만원) Beam radii near Cass. focus at 43GHz (Reflection by LPF2) 26.4mm 24.5mm Without LPF With LPF 2mm (2/26.4) difference

  11. (단위 : 백만원) Evaluation axial beam mismatch between theo. and exp. w0a=3λ • Woa/Wob : 26.5/24.7 @ 43GHz • : 49.5/47.4@22GHz • 1.05 both 22/43GHz • Beam coupling loss due to mismatch both 22/43GHz • apporxi. less than 1%

  12. LPF Loss Measurement Setup

  13. The additional Receiver Noise Temperature Due to the LPFs

  14. (단위 : 백만원) Quasi-optical circuit for Multi-band receivers

  15. (단위 : 백만원) Quasi-optical circuit at Lab Horn 22G M2 Flat M M3 M5 Cal chopper Flat M LPF2 M4 LPF1 LPF3 M1

  16. (단위 : 백만원) Quasi-optical circuit installed at receiver room of antenna 22GHz RX 43GHz RX M3 M2 Cal chopper M5 M4 M1

  17. Outline(II) Test observation for Evaluation of Quasi-optics Circuit

  18. Contour Map of Jupiter for 22GHz and 43GHz bands

  19. Contour Map of Jupiter for 22GHz and 43GHz bands 22GHz ( Red ) 43GHz ( Black ) Bold lines show HPBW

  20. The Pointing offset between 22GHz and 43GHz band at Jupiter October 28th 2008 43GHz ( Black ) 22GHz ( Red )

  21. The Pointing offset between 22GHz and 43GHz band at Jupiter March 6th 2009 22GHz ( Red ) 43GHz ( Black )

  22. Radiation patterns of Jupiter for 22GHz and 43GHz bands

  23. Orion-KL H2O and SiO Maser Line Simultaneous Observation Results !!!!! on October 28th 2008

  24. Aperture efficiencies at 22GHz/ 43GHz

  25. Summary • Pointing offset between 22GHz and 43GHz - less than 1” ( Pointing error of KVN antennas : 4”) • Successfully done simultaneous observation - 22GHz and 43GHz bands • Aperture efficiency 68%(70%) at both 22/43GHz • Quasi-optical evaluation for 86GHz and 129GHz - must be harder than that of previous ones • Development of 86GHz and 129GHz receiver optics - at least 2011.

  26. Thanks for your attention

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