76-m Lovell Telescope Jodrell Bank, UK
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76-m Lovell TelescopeJodrell Bank, UK
Even big telescopes see no moredetail than the naked eye
High bandwidth data transfer- the future of European radio astronomy
S. GarringtonJodrell Bank Observatory U.Manchester/e-MERLIN UK
on behalf of the European VLBI Network (EVN)
• New astronomical discoveries demand greater resolution and sensitivity
• Telescope networks provide resolution
… but sensitivity limited by tape recording
• At faintest levels, radio sky teems with galaxies
• Radio emission comes from birth and death of stars, often hidden by dust from optical telescopes
… but network provides50 x more detail than Hubble Space Telescope
2
Demonstrations using Géant
• Rapid move to disk buffering (MIT, JIVE, Metsahovi) at 0.5, 1 Gb/s• High-speed transfer is next• European demonstrations using GEANT core network
– specialised transfer s/w using UDP– iGrid2002: Tape/Disk 500 Mb/s transfer Man-Ams 24/09/02– First disk-disk test Jodrell Bank(UK)-Westerbork(NL) 24/10/02 data transferred via SJ4/Geant/SURFnet correlated at JIVE within hours
S Parsley (JIVE),R Hughes-Jones,R Spencer, P Burgess (Manchester)
3
Dante/EVN Proof Of Concept
• Network requirements– 5 or 6 telescopes connected
at 1-2 Gb/s each
– Real time transfer to correlator at Dwingeloo NL
– Continuous transfer for 24hr observations
• Agreed in principle by Dante/NRENs
• Local loops being pursued now in UK, DE, NL, SWE, IT, PL
• Expect science results by Nov 2004
Future usage (2005)• Routine operation for up to
16 telescopes across Europe & China at 1 Gb/s for ~50 days/yr
• Rapid response to transient events (eg GRBs, SNe)
• Link to UK e-MERLIN network and global VLBI network
With a new correlator (>2007)
40 - 80 Gb/s per telescope
4
Future Network
• Strong scientific and technical motivation for e-VLBI using research networks– flexibility & immediate response
– reliability & faster development
– greater sensitivity via bandwidth
• Plausible network connections to all EVN telescopes via Géant
local loops going in now• Real-time demo by 2004
1 Gb/s from 5 telescopes• Processed observations ~ TB/day
– remote access/processing on the GRID: Virtual Observatory
GEANT + NRENs can enable ‘always-on’ radio telescopeacross Europe
High bandwidth connection will allow us to exploit true potential of distributednetwork of European radio telescopes (and radio astronomers!)
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