swedish lofar: john conway hamburg, sept 17th, 2008 onsala space observatory, swedish national...
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Swedish LOFAR:John Conway
Hamburg, Sept 17th, 2008
• Onsala Space Observatory, Swedish national facility
for radio astronomy, provides access for Swedish astronomers to radio/mm- facilities.
• Separate low-freq effort led by IRF (see Bo Thide’s talk yesterday) – LOIS, alternative antenna design, experimental, look for POAM etc
• Onsala has long time involvement in interferometry, VLBI, ALMA etc.
• Involved with real-time VLBI interferometry over the internet since 2004. Synergy with LOFAR.
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First Transatlantic Radio Interferometry, Onsala, January 1968
Using recorded media, definitely not real-time.
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JANET
NetNorthWest
Jodrell Bank
JIVE + LOFAR.
FUNET
Metsähovi
SUNET
OnsalaNORDUnet routed IP
(simplified view)
GÉANT2
Rest ofSUNET
NORDUnet TSS Opto
TSS L2 Cloud
STO CSC
CPH
Rest ofFUNET
SurfNET
SUNETproject router
VLANs
HAM
Network Infrastructure- lots of cooperation with SUNET, NORDUNET
Data goes through Hamburg
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Recent Internet Interferometry Progress
• In June 2008 demonstrated 4Gbps from Stockholm through to Jodrell Bank UK
• In July 2008 demonstrated 8Gbps from Onsala to Metsahovi in Finland (8 times higher data rate than disk recording!) Autocorrelation spectra on water masers
•Have up to 10Gbit/s capacity through to Netherlands so we can simultaneously send eVLBI and LOFAR data
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Joint the centimetre and decametre wavelength interferometry communities
All invited to conference on Science and technology of real time interferometry.
Madrid, June 22-26t
2009
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E-LOFAR
96 HBA tiles 96 LBAs
Inter-tile distance: 0.6m
Swedish station greatly helps NS uv coverage
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LOFAR station at Onsala• Research council planning grant for 2006/2007 (600kKr = 70kEuro).
Meetings, RFI (radio frequency interference) test of our site by ASTRON–positive result
• November 2007 Swedish research council application from Onsala Space Observatory for funding a full LOFAR station was successful (6.8Mkr =720kEuro). ++
• Site identified, needs ’remodelling’ of landscape. Have applied for planning permission for blasting etc should get permission by early November at latest.
• Manpower, Network Engineer (EXPReS), new PhD student, Interferometry software support position (with ALMA)
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Science Interest•Garrelt Mellema, EOR KSP – Stockholm
•John Conway, Extragalactic Survey KSP Local star-forming galaxies. Compact objects in nearby galaxies (SNe, SNR, AGN) links to proposed eMERLIN Legacy projects. Young radio galaxies (CSS/GPS) source statistics from MSSS. Göran Östlin, Nils Bergvall also potentially interested in surveys.
• Bo Thide, Solar and Space Weather KSP
•Other interests, Cluster sources, Transient stellar sources (Univ of Gothenburg). Recombination lines (John Black)
•Organising consortium meeting for late October in Stockholm
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Onsala LOFAR site
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OSO LOFAR – Site preparation
Picture showing area after site preparation
Rock blasted in 30deg el fromthe 70m d limit
340 + 80 m3 filling needed(reuse stone from the blasting)
About 1 hectare foresthave to be cut down
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OSO LOFAR – Final configuration