SKA Status and Capability Update Robert Braun, Science Director 13 September 2017
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SKA Science Book 2015 135 Chapters, 2000 pages, 8.8 kg Plus new science directions that continue to emerge! 3
SKA Organisation: 10 countries, more to join Australia (DoI&S) Canada (NRC-HIA) China (MOST) India (DAE) Italy (INAF) Netherlands (NWO) New Zealand (MED) South Africa (DST) Sweden (Chalmers) UK (STFC) Interested Countries: France Germany Japan Korea Malta Portugal Spain Switzerland USA Contacts: Brazil Ireland Russia 4
Negotiations to establish SKA Inter-Governmental Organisation. Text of Convention and protocols now agreed Plan to initial documents in October 2017 Ministerial signing ceremony in December 2017 Transition planning underway 5
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SKA HQ: Jodrell Bank, UK New, 20M building, complete Q2 2018 State-of-the art facilities 8
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View from Lovell Telescope tower, 30/08/2017 SKA HQ 10
SKA HQ 11
Design Baseline / Deployment Baseline Design Baseline Deployment Baseline Re-instatement + means add to system SKA1-Mid No. dishes 133 130 +3 dishes at 150 km Max. Baseline 150 km 120 km + infra to 150 km Band 1 Feeds 133 130 +3 Band 1 Feeds for 3 dishes Band 2 Feeds 133 130 +3 Band 2 Feeds for 3 dishes Band 5 Feeds 133 67 +66 Band 5 feeds Pulsar Search 500 nodes 375 nodes +125 nodes (PSS) SKA1-Low No. stations 512 476 +36 stations (18 stns at 49 & 65 km) Max. Baseline 65 km 40 km +infra to 65km Pulsar Search 167 nodes 125 nodes +42 nodes Common Compute Power 260 PFLOPs 50 PFLOPs +210 PFLOPs Outcome of July SKA Board Meeting Design Baseline for which CDRs will be undertaken is unchanged Deployment Baseline is scoped for cost-capped Construction budget Further analysis of Low B Max underway Re-instatement of HPC and PSS already part of Operational budget Re-instatement commitment for all items as soon as funding permits 12
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Dish Update Two prototypes to be ready by Sept/Oct, one in CN, other on SKA1-Mid site Total surface RMS < 350 μm, relative pointing RMS <1.3 arcsec Good performance anticipated to ~50 GHz (cf. VLA has ~500 μm RMS) 15
SKA1 VLA PWV comparison High frequency performance of SKA1-Mid site (2010 2015) compared to VLA site (Forkman & Conway 2017) Annual average P10 and P50 of two sites essentially equal 16
Dish Update New performance estimates from feed PDR documentation Better A eff /T sys performance in Band 5a/b: 4.6 15.3 GHz Cryostat can accommodate additional feeds (dot-dashed in plot) Realistic T atm and τ data for SKA1-Mid site; freqs. up to 50 GHz viable 17
Sensitivity Comparison 18
Sensitivity Comparison 19
Signal / Noise versus Fractional Bandwidth Large Δν/ν c useful for flat spectrum sources Less benefit for α 0 Dusty protoplanetary disks: α = 2 4, 77% of s/n from 10% of Δν/ν c 20
Survey Speed Comparison 21
Resolution Comparison 22
Image Quality Comparison Single SKA1 track equivalent to VLA A+B+C+D + E+A + Structural dynamic range of ~1000:1 rather than ~3:1 per track Beam quality ~100 times better than VLA 23
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Image Quality Comparison Beam quality ~100 times better than LOFAR 26
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Critical Design Review Schedule Milestone Date (TBC) AIV CDR close December 2018 CSP CDR close July 2018 DSH CDR close (Bands 1 & 2) March 2019 DSH CDR close (Band 5) April 2019 INAU CDR close July 2018 INSA CDR close July 2018 LFAA CDR close July 2018 SaDT CDR close April 2018 SDP CDR close December 2018 TM CDR close June 2018 System CDR close December 2018 Construction Proposal submission March 2019 Based on frozen requirements (L1 Revision 11) 28
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