An update on future e-‐VLBI plans in Australia - CIRA

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An update on future e-‐VLBI plans in Australia - CIRA

ong>Anong> ong>updateong> on future e-VLBI plans in Australia

CSIRO Astronomy and Space Science

Tasso Tzioumis, October 2010


Overview

• The LBA

• Overview of network

• Brief history of e-VLBI

• Transitions in last 5 years

• e-VLBI status

• Recent progress

• Plans for the future

• (Details in Technical and Science talks)


Radio Telescopes in Australia

x Katherine

X ASKAP; SKA

Curtin X

x Yarragadee

x New Norcia

x

x

x


Long Baseline Array (LBA)

• Telescopes in Australia /Asia-Pacific / Southern hemisphere

• ATNF (ATCA, Mopra, Parkes); U.Tasmania (Hobart, Ceduna)

• NASA (Tidbinbilla)

• ASKAP ; + NZ ; AuScope; {New Norcia (ESA)}

• + South Africa (9000 km baselines) – Hart (& KAT-7)

• + Telescopes in Asia Pacific: Japan, China, Hawaii, VLBA,…

• Frequency range: 1-22 GHz

• Disks (XRAIDs) & eVLBI - up to 1Gbps (4 x 64 MHz)

• All (almost) data transfers electronically – Petabyte store & ARCS

• Software correlator(s) - DiFX

• Curtin University Supercomputer cluster - CUPPA

• “Real time” correlation from disks & eVLBI

• e-VLBI correlators at ATNF (Parkes; ATCA)

• Open VLBI network - proposals 15 June & December

• ** Includes e-VLBI proposals **


The Oz e-VLBI team

•CASS – LBA as National Facility

• ATNF telescopes & correlators (Parkes; Mopra; Narrabri)

• Chris Phillips – technical developments

• Shaun Amy – network developments

• AARNet – the Australian NREN **critical**

• University of Tasmania

• Hobart & Ceduna + AuScope

• Steven Tingay and his team(s) – (**growing)

• DiFX software correlator (Deller) – Swinburne Curtin

• Contract for all disk correlation + improved LBA Ops

• e-VLBI on Curtin cluster already demonstrated

• UWA (Dodson; Rioja)

• ICRAR – both Curtin and UWA – new funding

• ** Host for eVLBI10 workshop **


e-VLBI history on the LBA (1)

• 2004-2005: disks LBADR (transition from S2)

• Huygens probe to Titan – JIVE collaboration

• Catalyst for disk-recorder development

• First “e-VLBI” from Oz? – 20 Mbps (includes plane transfer!)

• Real-time fringe system (software correlator)

• 2006: Operations DiFX (Swinburne – Curtin)

• Networking / eVLBI

• AARNet3 Regional network

• Last-mile to ATNF antennas

• 2 x 1 Gbps (Ho @ 1 Gbps)

• EXPReS !!!

• Catalyst for e-VLBI in Oz

• ATNF-AARNet collaboration


e-VLBI history on the LBA (2)

• 2007-2008-2009 - Demos

• March 2007 – 1 st Oz eVLBI

• Parkes-ATCA-Mopra-(Hobart) - DiFX on 60-core CPSR2 cluster

• 3 x 256 Mbps (+ Ho @ 64-128 Mbps) Cir X-1 image and paper!!

• August 2007 – APAN EXPReS demo

• Europe + Oz + Shanghai @ 256 Mbps – world-wide publicity!!

• November 2007 – Oz EXPReS demo

• ATNF JIVE @512 Mbps for 12 hours SN1987A image

• 3 lightpaths Oz-Europe – critical NREN role!

• June 2008 - Shanghai eVLBI demonstration

• DiFX on APSR (18 node, dual-processor quad-core )- 5 x 512 Mbps Pk-At-

Mp-Sh-Ks

• March 2009 - e-VLBI on Curtin cluster in Perth (CUPPA)

• 3 x 1024 Mbps demonstration (+ 128 Mbps Hobart) publicity and political

support

• IYA international demos – Jan and Apr 09


e-VLBI operations on the LBA

• Operations - e-VLBI via LBA proposal system since 2007

• e-VLBI scheduled observations of Cir X-1

• Follow X-ray binary over >1 x 16.5 day orbits

• e-VLBI in July and Dec 2009 (see Aquib’s talk)

• ToO e-VLBI of Fermi source - J0948+0022

• Global runs May-July 09 – published (see Hayley’s talk)

• CAVE cluster at ATCA (14 nodes) – 2009

ong>Anong>other DiFX e-VLBI correlator

• Main production e-VLBI correlator

• Parallel e-VLBI & disk-recording demo (June ‘09)

• Quick-look at data e.g. transients

• Include stations with no eVLBI connections in imaging


Oz e-VLBI developments - 2009-10

(from eVLBI2009 in Madrid)

• Technical

• Broadband DBE

• CABB at ATCA X

• DFB3 at Parkes (& Mopra) - testing

• Broadbanding Receivers

• ATCA done V

• Parkes (and Mopra) underway V

• Other Oz antennas - new funding needed X

• 10 Gbps e-VLBI – planned with AARnet

• Initially Parkes-ATCA

• CABB as an e-VLBI h/w correlator – demo X

• More e-VLBI demos – national + international X

• Asia-Pacific; NZ; Brazil; India; …….

• Operational

• Implement parallel e-VLBI & disk-recording operation - tests

• Distributed e-VLBI correlation by DiFX X

X


** 2010 VLBI developments - ASKAP and NZ Warkworth

- First VLBI Observations

• New 12m antennas

• New Receiver systems @ 1.4 GHz

• Highest LBA resolution at L-band

• Custom VLBI recorder (Curtin)

• Images – publicity – paper published !


Future e-VLBI plans

• New connections and Demos / production e-VLBI

• 1 Gbps+ to Tasmania – production AARNet links

• e-VLBI with NZ (see Sergei’s talk)

• e-VLBI demo with single ASKAP antenna – mid 2011?

• Links Perth-Geraldton & Geraldton-MRO in construction

• VLBI & e-VLBI with GMRT India (testing)

• VLBI & e-VLBI with South Africa (Hart & KAT-7) (Michael’s talk)

• NEXPReS (Arpad’s talk)

• Bandwidth on Demand - AARNet

• Distributed correlation (Curtin)

• Again act as e-VLBI development catalyst (cf EXPReS)


Broadband e-VLBI plans > 1 Gbps

• Current limit at ~1 Gbps

• 1 Gbps connectivity

• But AARNet backbone at 10 Gbps – not a hard limit

• 1 Gbps DAS data rates – old LBA DAS (2 x 64 MHz)

• Strongest restriction

** Need wide-band DAS **

• CABB & DFB3

• Broadband DAS – up to 2 GHz BW for CABB

• DFB3 (1 GHz) – under testing

• Complex samples DiFX developments (testing)

• High data rate testing plans

• AARNet test 10 Gbps circuits – ATCA – Parkes

• Tests/demos planned - 4 & 8 Gbps (x 2?)


Longer term e-VLBI plans

• e-VLBI with and in support of ASKAP

• (See Steven’s talk)

• Grow and implement user e-VLBI network

• Involve all current and developing facilities

• Global e-VLBI

• Complementary to NEXPReS developments

• National Broadband Network (NBN)

• Government funded national infrastructure ($43B)

• NREN access for Science?…

• SKA e-VLBI component

• (see Lisa’s talk)


Summary & Concluding remarks

• e-VLBI on the LBA still developing

• Plans for new antennas and demos

• National, regional and international

• Increase production e-VLBI capabilities

• Go to higher bandwidths

• Needs new DAS developments

• NEXPRES participation

• NREN participation **critical**

• Future linked to SKA developments

• ASKAP developments – VLBI/e-VLBI critical


CSIRO

Astronomy and Space Science

Tasso Tzioumis

VLBI/eVLBI Project Leader

Phone: +61 2 93724350

Email: Tasso.Tzioumis@csiro.au

Web: www.atnf.csiro.au/vlbi

Thank you

Contact Us

Phone: 1300 363 400 or +61 3 9545 2176

Email: enquiries@csiro.au Web: www.csiro.au


Future:

SKA - an e-VLBI array!!

SKA

1Tbit/s data transport

requirement in inner array

100 Gbit/s data transport

requirement in outer array

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