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The Progress Report for KVN Construction

The Progress Report for KVN Construction. Seog-Tae Han and KVN staffs Korea Astronomy and Space Science Institute March18 th 2009. Outline. Overview of KVN Antenna construction Receivers and their test results

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The Progress Report for KVN Construction

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  1. The Progress Report for KVN Construction Seog-Tae Han and KVN staffs Korea Astronomy and Space Science Institute March18th 2009

  2. Outline • Overview of KVN • Antenna construction • Receivers and their test results • DAS(Data Acquisition System) • Future plan and Summary

  3. 2001 ~ 2008 • 3 stations with 21m radio telescopes - Cassegrain type • 22,43,86 and 129GHz band Receiver - Simultaneous observation of four bands - first proposed in the world • Digital DAS system has been completed • Correlators will be completed in 2010 • Millimeter-wave VLBI Astronomy Seoul (Yonsei) Ulsan (Ulsan) Overview of KVN Jeju(Tamna)

  4. KVN Yonsei Observatory (Yonsei University at Seoul)

  5. KVN Ulsan Observatory (Ulsan University)

  6. KVN Tamna Observatory (Tamna University)

  7. Aperture efficiencies • Pointing Accuracy- 4 arcsec at 100GHz

  8. Outline • Receivers and their test results

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

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

  11. The Pointing offset between 22GHz and 43GHz band at Jupiter 22GHz ( Red ) 43GHz ( Black )

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

  13. East Asian VLBI Network with KVN Mizusawa YonseiUniv.

  14. W49N H2O Maser Dater : 2008. 11. 1. W49N H2O maser Star formation region Honma et al.(2008)

  15. Development of 22GHz receiver Polarizer & OMT Isolator RHCP LHCP LNAs

  16. Development of 22GHz receiver Amplitude and phase Calibrator for receiver IF converter 22GHz down to 9GHz/2GHz

  17. M&C Development of 43GHz receiver Local osc LHCP LNAs RHCP Polarizer & OMT Isolator

  18. KVN Down Converter Properties • Input Frequency : 8-10 GHz • Output Frequency : 512-1024 MHz • LO Frequency : 8.7-10.8 GHz, LSB • Number of Channel : 4 Channel • Output Power : ~ 0 dBm • Headroom : > 20 dB

  19. Receiver Noise temperature of 22GHz and 43GHz band Receivers

  20. Q-band HEMT amplifier from NRAO Expected Receiver noise temperature : 35~40K

  21. Outline • DAS(Data Acquisition System)

  22. 4channels Analog Inputs( 750MHz/500MHz IFs of 22, 43, 86, 129GHz ) • 4 channels 2Gbps(500MHz) samplers • 1Gbps recorder (MK5B) • 256MHz, 128NHz,64MHz, 32MHz,16MHz and 8MHz • 500MHz 4 channels digital spectrometers - single antenna observation mode • It has been completed for 3 stations DAS (Data Acquisition System)

  23. Digital Filter mode Digital Spectrometer Mode 1. Wide band mode - 512MHz X 4 bands ( 22,43,86,129GHz) @4096ch. 2. Narrow band mode - 256MHz, 128MHz, 64MHz, 32MHz, 16MHz, 8MHz

  24. Outline • Future plan and Summary

  25. Timeline for system development

  26. Summary and Discussion • Simultaneous observation for 22/43GHz and • VLBI Observation between KVN and VERA • successfully have been performed • - Aperture efficiency : 51%@100GHz • Pointing accuarcy : 4”@ 100GHzx • 22/43GHz Receivers will be installed at • KVN Ulsan and Tamna observatories • in this year • - 86GHz and 129GHz will be completed • until 2011.

  27. Thanks for your attention

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