VLBI progress Down-under Tasso Tzioumis Australia Telescope National Facility (ATNF) 25 September 2008.

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Presentation transcript:

VLBI progress Down-under Tasso Tzioumis Australia Telescope National Facility (ATNF) 25 September 2008

Outline Down-under == Southern hemisphere VLBI in Australia (LBA) Progress in the last few years Disks and software correlation e-VLBI Status and capabilities OPEN network – proposals (15 June & Dec) 9th EVN workshop Bologna September 2008

Long baseline Array (LBA) Telescopes in Australia CSIRO ATNF (ATCA, Mopra, Parkes) U.Tasmania (Hobart, Ceduna) NASA (Tidbinbilla) + NZ ; AuScope; New Norcia (ESA); ASKAP International connections + South Africa (9000 km baselines) + Telescopes in Asia Pacific: Japan, China, Hawaii, VLBA,… Asia Pacific Telescope (APT) East Asia VLBI Network (EAVN) – see Kobayashi talk. Frequency range: 1-22 GHz L: GHz; S: GHz; C: GHz (includes methanol) X: GHz; Q: GHz (20-22 GHz circular) (ATCA & Mopra: GHz; GHz – mm-VLBI?? ) 9th EVN workshop Bologna September 2008

LBA Radio Telescopes in Australia x Katherine x New Norcia x Yarragadee x ASKAP x

Latest developments – recording Until 2006 – limited to 128 Mbps S2 VCR tape system CSIRO LBA hardware correlator (7-stations) System decommissioned at end-2006 New Disk recording system (LBADR) based on EVN-PC developments (Metsahovi) 256/512 Mbps with 16 MHz bands 512/1024 Mbps with 64 MHz bands Recorded on normal disks 2 x 500 GB internal disks (tests & urgent response) 4 x 500 GB removable SATA disks (not shipped; fast response) 7 TB Xserve RAID disks (bulk recording & shipping) Remote disk recording over the network Can record in Mk5b format - compatibility 9th EVN workshop Bologna September 2008

Latest developments – correlation Software correlation only - DiFX Developed at Swinburne by Deller Runs on computer clusters – many correlation centres Swinburne; CSIRO (2); Curtin Very versatile (e.g. many 1000s of spectral channels) Very scalable Can accept many formats: LBA, Mk5, K5… Has also been adopted by VLBA & Bonn International development and support only VLBI correlator in Australia RPFITS output IDI-FITS (vlba) Real-time fringe testing reliability Direct streaming inputs eVLBI capable 9th EVN workshop Bologna September 2008

Latest developments – e-VLBI Direct network connections 2 x 1 Gbps connections/telescope for 3 ATNF antennas 1 Gbps Hobart-University (only 2 x 155 Mbps outside) e-VLBI software correlator Pulsar processing clusters (~ 16 nodes) at Parkes e-VLBI tests and observations 1 st observations in March 256 Mbps (paper!) Demonstrations & EXPReS participation APAN demo in August 2007 (huge publicity) Oct07: 3 x 512 Mbps into JIVE (lightpaths) – SN1987A image Jun08: 5 x 512 Mbps into Parkes(3xOz; Shanghai; Kashima) 9th EVN workshop Bologna September 2008

First e-VLBI images from the LBA 9th EVN workshop Bologna September 2008 SN1987A Circinus X-1

Image created by Paul Boven Satellite image: Blue Marble Next Generation, courtesy of NASA Visibible Earth 9th EVN workshop Bologna September 2008

Further LBA developments (1) 2 nd computer cluster eVLBI correlator (ATCA) 2 x 1024 Mbps achieved; 3 x 1024 Mbps in 2008 Parallel e-VLBI & recorded observations Fast response (3 ant) & later imaging (5+ ant) Recorded VLBI correlation at Curtin Steven Tingays growing VLBI group Disk shipping network data transfers Contract to streamline scheduling & calibration Better user support !! 9th EVN workshop Bologna September 2008

Further LBA developments (2) planned developments: Network connectivity to Curtin cluster Data transfers & e-VLBI National and international e-VLBI capabilities and demonstrations (IDEA Internet2 award…) 10 Gbps connections Wideband DAS (based on DPFB) 1-2 GHz bandwidths 10 GE output only (Mk5c?) Broadband antenna receivers (ongoing) Incoporate 12m NZ geodetic antenna (in construction) 2010+: Australian SKA Pathfinder (ASKAP) Work with and complenetary to ASKAP (e.g. transients) 9th EVN workshop Bologna September 2008

Current LBA capabilities and status Sensitivity increased by ~ x 3 times LBA sensitivity and uv calculator Recorded and e-VLBI offered to users Proposals on 15 Dec and 15 June Any new developments offered to users quickly! Scheduling: standard SCHED & VEX files Observing: Automated and often remote Wiki: real-time fringe testing for every observation reliability Calibration/analysis: standard via AIPS/DIFMAP Niche instrument – contact us for any specials 9th EVN workshop Bologna September 2008

Contact Us Phone: or Web: Thank you ATNF Tasso Tzioumis LBA & eVLBI Phone: Web: 9th EVN workshop Bologna September 2008