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The Bonn Mark IV Correlator for Astronomy and Geodesy

The Bonn Mark IV Correlator for Astronomy and Geodesy. Arno Müskens Geodetic Institute – University of Bonn Walter Alef, Dave Graham Max-Planck-Institute for Radioastronomy, Bonn Alessandra Bertarini Geodetic Institute – University of bonn We present:

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The Bonn Mark IV Correlator for Astronomy and Geodesy

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  1. The Bonn Mark IV Correlator for Astronomy and Geodesy Arno Müskens Geodetic Institute – University of Bonn Walter Alef, Dave Graham Max-Planck-Institute for Radioastronomy, Bonn Alessandra Bertarini Geodetic Institute – University of bonn We present: We report on the present status of the MPIfR/BKG MK IV Correlator in Bonn. Processing efficiency for geodesy and astronomy experiments Upgrade plan to 12 stations

  2. Bonn MK IV Correlator: Status 9 station inputs used (of 16 total) 7 tape units 8 Mark 5As 3 Mark 5Bs (in the pipeline) Successfully correlated: 1 Gbit/s with 8 stations 512 Mbit/s is standard for mm-VLBI Tape recordings with 32 tracks and Mark 5A recordings with 64 tracks in one pass, corresponds to data-rates of 256 to 1024 Mbits/s Support of MarkIIIA, VLBA and Mark IV and Mark5A formats Geodesy: 16 stations in 5 passes

  3. Bonn MK IV Correlator upgrading BKG and MPIfR decide to upgrade the correlator to 12 Mark 5Bs disk playback systems (similar projects are underway at MIT Haystack Observatory and at USNO in Washington) Upgrade from 9 to 12 station is only possible by the Mark 5Bs systems (including a newly designed SU) As part of the Mark 5Bs development mostly done by MIT Haystack, MPIfR has developed and manufactured so-called high-speed serial links for all other correlators (Haystack and Washington) MPIfR and MIT Haystack have further agreed on a joint project for upgrading the correlator software to allow the correlation of 12 stations simultaneously + implementation of 2 Gbits/s recordings which will be correlated at a rate of 1 Gbits/s + replacing the present HP-UX based workstation with and cheaper solution based on the LINUX operation system Pic.01 : three new cabinets populated with up to four Mark 5s and the CIB

  4. Status Bonn Correlator / Jan.2006

  5. e – VLBI Status • MPIfR will install privat fibres between the 100m-antenna at Effelsberg and the institute at Bonn • A few fibres to connect the institute of the University of Bonn are already in the building • To connect e-VLBI from the University to the European academic network „Géant” the optical testbed VIOLA might be used. Data transfer via VIOLA connection would be free. MPIfR submitted a proposal to become an associated member • e-VLBI will use separate fibres to the normal Internet traffic to avoid problems with Internet security • Planned is to drive the e-VLBI fibres at 10 Gbits/s if possible • VIOLA connection to „Géant“ is limited to only 2.5 Gbits/s • Gbit connectivity to the correlator can be expected in late summer 2006 GÉANT is the sixth generation of pan-European research network and connects European countries at backbone speeds of up to 10Gbps VIOLA Vertically Integrated Optical Testbed for Large Applications in DFN

  6. Geodetic Correlation • more than 50 experiments were correlated at Bonn ( IVS-R1, IVS-T2, Europe, IVS-OHIG, a few CONT05 and a few test experiments ) • about 7200 hours processing time; about 40 % for Astronomy and 60 % for Geodesy • unattended correlation was possible for sessions that involved a maximum of 8 Mark 5 equipped stations, no tapes and which needed only one module per station • IVS-OHIG 2004 were correlated Dec.2005 / Jan. 2006 • CONT05; due to some problems during correlation and fitting data it becomes clear that correlation and processing at all three correlators had to be standardised to minimize systematic differences between the sessions

  7. Geodetic correlation overview

  8. Astronomy Correlation • Different projects observed and correlated, chiefly for local PI´s but also for densification of position catalogues of compact sources and station position measurements of EVN antennas at 22 Ghz • Bonn correlator is used for analysis in the global 3 mm array ( experiments with 8 VLBA and 5 Europe antennas ), recorded with 512 Mbits/s in a 64-track mode • Some 1 Gbits/s recordings • Spectral line correlations; using 512 lags and multiple passes

  9. Summary • With the introduction of the lower-cost Mark 5B to replace both the Mark IV playback and station units, the correlator can be extended to up to 16 stations with moderate resources • In the present step, MPIfR and BKG will upgrade the correlator to 12 stations by adding four Mark 5B´s, including a new LINUX-based computer and a software upgrade to be developed in collaboration with Haystack Observatory • The reduced number of tape drives and station units will still be maintained until IVS stations have upgrade to Mark 5 • In late summer we expect to have Gbits/s connectivity from the correlator into Géant (European Academic network) via dedicated fibres and shared lines of the 10 Gbit/s optically-switched test network VIOLA Thank you for your attention!

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