EVLA Prototype Correlator (PTC)

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Presentation transcript:

EVLA Prototype Correlator (PTC) P. Dewdney Herzberg Institute of Astrophysics National Research Council Canada

On-the-Sky Testing Primary purpose – DRAO led (Critical OTS Tests). Verify Hardware so that production phase can proceed. Check for HST-style bloopers. Secondary Purpose – NRAO led. Integration of a “small” system with EVLA software. Testing of such, and further checks of software through-put. Tertiary Purpose – NRAO led. Test wide-band observing. Develop wide-band calibration techniques. Quaternary Purpose – NRAO led. Look at wide-band RFI environment. Develop evasion/expurgation measures. Quinary Purpose – NRAO led. Carry out early observations where possible. P. Dewdney EVLA F2F - Dec 2007.

Correlator System Testing Summary Stage 1/2: Prototyping and testing. Stage 3 Prototype testing 16SB/16BB in racks will form “testable unit sub-systems”, loaded in a way that is very similar to final rack configuration. Subjected to as many tests as possible in lab environment. When complete, the OTS system will be shipped to Socorro. On-the-Sky (OTS) – 10-antenna. Principal DRAO purpose is to verify hardware in-system. Check for HST-style bloopers. Long integration times available. Already done for correlator chips. Could be done in the lab, in principle. Production Testing Both correlator chips and finished circuit boards will be subjected to temperature cycling and subsequent testing/burn-in before leaving DRAO. Methodology is worked out, but precise details are not. Testing hardware and equipment has been purchased or developed. P. Dewdney EVLA F2F - Dec 2007.

Critical OTS Tests Nature of decision Michael/Brent’s list (4 months?) Is the fault that you just detected possibly attributable to the H/W and not FW or SW? Most testing will have been done in Penticton. Most bugs will not be the correlator. But … if there is a correlator bug, it will be exist forever. Answer is real-time monitoring of the OTS tests. Michael/Brent’s list (4 months?) Basic setup/connectivity checks Delay tracking Noise switching First fringes Strong source, known flux density (check corr’n coeff) Deep integration on mostly blank field (corr offsets and other systematics) Deep spectral line integration (bandpass stability) Recirculation on narrow line(s) Sub-band stitching (comes “for free”) P. Dewdney EVLA F2F - Dec 2007.

Major Question Should we skip Critical OTS testing? If we “overkill” the OTS testing before production is triggered, does that slow down science operations? i.e. How much does the correlator hardware production schedule affect the overall EVLA schedule? P. Dewdney EVLA F2F - Dec 2007.

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