Possible Engineering Support for Dual Polarization and Ultra Wide Band Observation with EAVN N. Kawaguchi National Astronomical Observatory East Asia VLBI.

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Presentation transcript:

Possible Engineering Support for Dual Polarization and Ultra Wide Band Observation with EAVN N. Kawaguchi National Astronomical Observatory East Asia VLBI March 18, 2009

Importance of Dual Pol. Observation Polarization Imaging – Distribution of magnetic field around an AGN core and a jet is extremely important to understand radio emission from AGN. Highly Sensitive Maser Observation – Only possible solution to have better sensitivity in observing maser sources is to observe in both polarization, larger bandwidth is not effective for better SNR not like as an observation of a continuum source.

Importance of UWB Observation Highly Sensitive Continuum Observation – Square root 2 better sensitivity we can enjoy in a continuum observation on twice wide bandwidth. – We need high sensitivity to detect correlation between cross polarized signals. Better Delay Resolution in Geodetic VLBI – Twice larger bandwidth produces twice better delay observations, and gives better accuracy in a geodetic VLBI solution. Better Sensitivity in Faraday Rotation Measure

Talks today Brief Summary of the status of Japanese stations Dual Polarization Receiving System to be implemented in VERA Experimental results of a X-pol observation recently performed with real time eVLBI connection at a speed of 2G-bps and recording on disks for off-line processing Correlation Support

Japanese Stations StationFrequency Dual Polarization Capability eVLBI Connectivity Tomakomai 11m22GPlannedPlanned in 2009 VERA Mizusawa 20m2, 6.7, 8, 22, 43GPlanned in 2009 in 22GNot connected Ibaraki 32m x 26.7, 8, 22GPlanned in 2009 and afterPlanned in 2009 Kashima 34m2, 8, 22, 43GPossible in 8GConnected Tsukuba 32m2, 8, 22GPossible in 8, 22GConnected Usuda 64m2, 8GPlanned in 8GNot Connected Nobeyama 45m22, 43GPossible in 22, 43GNot Connected Gifu 11m22GPlannedConnected Yamaguchi 32m6.7, 8, 22GPossible in 8, 22GConnected VERA Iriki 20m2, 6.7, 8, 22, 43GPlanned in 22GNot Connected VERA Ishigaki 20m2, 6.7, 8, 22, 43GPlanned in 22GNot Connected VERA Ogasawara 20m2, 6.7, 8, 22, 43GPlanned in 22GNot Connected

Dual Polarization Receiver of VERA Minimum Implementation Plan 2 Freq. D/C 2 Freq. D/C 4:2 IF Selector Methanol Receiver 2 channel BBC ADS-1000 Beam ABeam B 22G43G22G43G LO 5-7G 6.7G RLLLL

Real time X-pol eVLBI Detection 016Day, 2009 on 3C454.3 Real time detection and off-line processing of data archived on disks at a data rate of 2Gbps were successfully done.

Wideband Recorder in VLBI UnitRecording MediaData RateStorage Capacity* DIR-1000Magnetic Tape1Gbps80 minutes Mark-VbRemovable 8 HDDs1Gbps27 Hours FDR-1000Removal 12 HDDs2Gbps20 Hours Mark-VcRemovable 8 HDDs4Gbps13 Hours K5 （ ADS-3000+PC-VSI)Fixed HDDs 4Gbps 17 Hours** RVDBFixed 24 HDDs8Gbps 40 hours * 1.5 TB HDD except for K5 is assumed. ** Deliverer’s anouncement Gigabit Data Recorder in the world

Outlook of FDR-1000 installed in VERA Mizusawa Station VSI I/F (VERA Terminal) FDR-1000 I/O Box 2Gbps x 1ch 1Gbps x 2ch Disk Cartridge (12HDD x 2)

ADS PC-VSI Recorder 4096Mbps recording for １７ hours

Generalized 10GigE Data Distribution Concept Channelized Ethernet packets dBBC/ DBE/ VDBE MK-Vc

Configuration of an RVDB base unit VSI I/F Unit (DIO) Disc Unit (DDB) Disc Unit (DDB) 10GbE Switching Hub VDB-2000 system (One I/F unit and four disc units) I/O data rate is 2048 Mbps each Disc Unit (DDB) Disc Unit (DDB) D Port C Port D Port C Port D Port C Port D Port C Port 10GbE HDD×24 in each Unit 10GbE

RVDB installed in Usuda 64m RVDB System ADS-1000 (1GHz AD, 2bit) DIO Unit 2Gbps x 4 10GbE DDB Unit (24 HDDS)

Correlation Support (KJJVC) Pictured by Dr. Roh 8Gbps/antenna 16 I/O port 120TB

Polarization Sprit Recording Station 0 DIO DDB DIO DDB DIO DDB Playing back at a quadruple speed is possible. Station 1 Station 0 Station 1 Station 2 Station 3 Station 2 Station 3 Station 4 Station 5 Station 4 Station 5 Station 6 Station 7 Station 6 Station 7 Station 0 Station 1 Station 2 Station 3 Station 4 Station 5 Station 6 Station 7 1Gbps 2Gbps 512Mbps x2 512Mbps x2 RHCPLHCP

8-Gbps Processing

Conclusions A dual polarization receiver is important for coming VSOP-2 observations. An UWB receiver is important to achieve high sensitivity, especially in detecting cross polarized term. Wide band high speed data recorder is now available for the maximum 8-Gbps data rate. KJJVC in Seoul becomes soon ready for correlation of X-pol and UWB.