Australia Telescope Users Committee Technologies Report – October 2011 Graeme Carrad Theme Leader – Technologies for Radio Astronomy CSIRO Astronomy and Space Science 25 October 2011
Compact Array Broadband Backend Status • 64 MHz zoom mode with all 16 zooms available has an estimated delivery date of year end 2011. • Wilson handover • Leave • Tim Bateman will transfer from ASKAP to CABB and will concentrate on problems that contribute to operational bugs and unreliability. • Warwick Wilson back in the country and working in with Bob Sault. • Lessons learned from implementing 1 MHz and 64 MHz allow faster delivery of the remaining two modes …or are CABB’s bugs to be fixed first? – feedback needed. CSIRO Astronomy and Space Science - Technologies for Radio Astronomy
20/13 and 6/3 cm Upgrade Project 4 – 12 GHz Receiver Upgrade • Australian Astronomy Limited (AAL) funding commenced in July 2011. Scheduled for completion in June 2013. • Two 4 – 12 GHz LNAs have been fabricated and incorporated into a proof of concept receiver. Amplifier noise temperature ~7. 5 K. Receiver noise temperature ~9 K • The receiver is to be installed and tested on a Compact Array antenna in the last week of November. (week starting 28 th) CSIRO Astronomy and Space Science - Technologies for Radio Astronomy
20/13 and 6/3 cm Upgrade Project (2) 4 – 12 GHz Receiver Upgrade • Measurements of the existing feed and OMT indicate they do not cover the full band. • A new OMT has been fabricated and performs well CSIRO Astronomy and Space Science - Technologies for Radio Astronomy
20/13 and 6/3 cm Upgrade Project (3) New. CX OMT Return Loss Old CX OMT Return Loss 0 -5 A Polarisation S 11, S 22 (d. B) -10 B Polarisation -15 -20 -25 -30 A Polarisation -35 B Polarisation -40 3 4 5 6 7 8 9 Frequency (GHz) CSIRO Astronomy and Space Science - Technologies for Radio Astronomy 10 11 12 13
20/13 and 6/3 cm Upgrade Project (4) Old and New OMT Isolation -30 Old OMT -35 S 21 (d. B) New OMT -40 -45 -50 -55 -60 3 4 5 6 7 8 9 Frequency (GHz) CSIRO Astronomy and Space Science - Technologies for Radio Astronomy 10 11 12 13
20/13 and 6/3 cm Upgrade Project (5) • We will look at options for the feed but must ascertain if resources are available before proceeding to outfit the array • ICT engaged to conduct a study for a feed design that achieves the desired bandwidth but constrained to the same feed throat dimension as the current C/X feed. • Any loss of science above 11 GHz please communicate to Project Scientist Naomi Mc. Clure Griffiths. CSIRO Astronomy and Space Science - Technologies for Radio Astronomy
Other activities • Talks with FAST project and JBCA regarding a design study for a multibeam now at contract preparation stage. CSIRO Astronomy and Space Science - Technologies for Radio Astronomy
Thank you CSIRO Astronomy and Space Science Graeme Carrad Theme Leader – Technologies for Radio Astronomy Phone: 61 2 9372 4305 Email: Graeme. Carrad@csiro. au Web: www. atnf. csiro. au Contact Us Phone: 61 2 9372 4100 Fax: 61 2 9372 4310 Email: atnf-enquiries@csiro. au Web: www. atnf. csiro. au
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