VLBI Report LBA Operations & eVLBI Tasso Tzioumis ATNF May 2008.

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Presentation transcript:

VLBI Report LBA Operations & eVLBI Tasso Tzioumis ATNF May 2008

Operations - transitioning Evolution: – S2 tapes + LBA correlator - Stopped in –Disk-system + software correlator - Main user system –eVLBI - in development. Already offered to users. Software correlation –Contracted to Swinburne from 1 October 2006 (2 years) –Worked very well - no major problems –May substantially transfer to Curtin in 2008 Movement of key people Under negotiation with Swinburne & Curtin Public Wiki for all LBA observations –Schedules; setups; logs Remote VLBI observing tested - Mp fully remote

LBA Statistics 2007 Failures: Parkes: almost all due to high wind Ceduna & Hobart: Windstows and some power problems Tidbinbilla: Some config problems (personnel change) ** High success rate -- real-time fringe checking **

Network connectivity AARNet3 Regional Network to ATNF antennas –2 x 1 Gbps connectivity for each ATNF antenna 3rd 1 Gbps link for lightpaths to Europe (EXPReS) –10 Gbps (x multiple wavelengths) backbone Hobart 1 Gbps to UTas operating –Bass-Strait link still very limited. Correlator connectivity: –Swinburne 1 Gbps “almost” there (2 years….) –Curtin links planned –Good connectivity to Europe Data transfers disk-to-disk to Bonn correlator Have avoided disk shipping 1 Gbps lightpaths to Europe! (see eVLBI) Better international connectivity than within Australia!!

eVLBI - Oz developments Pk-At-Mp eVLBI Longbaseline Array (PAMELA) March initial development: –Parkes CPSR2 30-node cluster for software correlator –Successful test observations 256 Mbps –Limited observations with Hobart at 128 Mbps –Circinus X-1 detected at 18 & 3 cm -- Paper published within weeks!! Further developments : –Improved cluster connections - new nodes –512 Mbps capability developed & offered to users –1 Gbps tests successful (Pks-ATCA) In progress: –New APSR cluster to improve processing capabilities

eVLBI - International EXPReS tests: –July 2007: Mopra; Shanghai; European telescopes; JIVE hardware correlator Longest eVLBI baseline (Mp-Darnhall) Huge international publicity!! –October 2007: Mp-ATCA-Pks to JIVE 3 x 1 Gbps dedicated lightpaths! 12 hour hardware correlation at 512 Mbps Paper on SN1987A submitted!! Planned for June 2008: –ATNF antennas + Shanghai(China) + Kashima(Japan) –Correlation at Parkes on Swinburne software correlator Extremely valuable connections to networking world –Internet2 IDEA prize won!! (Shaun Amy) Science + Publicity!

LBA - Current Status User facilities: –Disk recording up to 512 Mbps / 1 Gbps (ATNF) May require justification for v. high rates Software correlation at Swinburne/Curtin –PAMELA eVLBI at 512 Mbps 1 Gbps tested but limited –Fast response ToO and NAPA proposals possible eVLBI (3 antennas) for quick look Disk recording for imaging Mk5b recording supported –International compatibility –Geodetic VLBI with all ATNF antennas (new) –LBA data can be correlated at Bonn!

ATNF operations model & VLBI Integrated scheduling with ATNF schedules Main impact from proposed restricted receiver changes at Parkes. –Loss of flexibility –Proper-motion projects (almost) impossible Move to shorter VLBI/eVLBI blocks? –minimise disk swaps & transfer over network? –Some issues with Tid scheduling last minute schedule changes/swaps? Cost and Impact of VLBI –Refer to future ops discussion forum submissions –