jvla capabilities to be offered for semester 2013a n.
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JVLA capabilities to be offered for semester 2013A. Claire Chandler. Capability definition and process. Considerations: Promises made in Program Operating Plan Promises made by EVLA construction project Technical and software readiness Commissioning readiness

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capability definition and process
Capability definition and process
  • Considerations:
    • Promises made in Program Operating Plan
    • Promises made by EVLA construction project
    • Technical and software readiness
    • Commissioning readiness
    • Hand-over of user portal software and databases from Open Sky Software to NRAO on June 30, including PST
  • Proposal presented by Michael Rupen to ECSV group following discussions with software developers
  • Call for Proposals on July 9 for semester 2013A will be for first observations under “Full Operations”, but commissioning not complete by then
    • Concept of Shared Risk will continue for the moment
capability categories
Capability categories
  • Observing capabilities will be divided into 3 categories:
    • General capabilities for Full Operations
      • Well tested capabilities, if an observation fails because of software or hardware problem, it is returned to the dynamic scheduling queue
    • Shared Risk
      • Anything not under “general capabilities” that can be set up in the OPT and run through the OST but is not well tested
      • SR observers will receive 1 hr of test time to validate their correlator set-up and observing procedure
        • Success => submit science SB
        • Failure => come and visit for 1-2 weeks to help sort it out, or forfeit science time
      • All Shared Risk projects will be observing priority B
    • Resident Shared Risk
      • For stuff we really don’t know how to do yet, or is known not to be robust
      • Will relax the residency requirements in Full Operations: no minimum stay of 3 months, but still 1 month visit per 20 hours of observing time
general capabilities 1
General Capabilities (1)
  • 8-bit samplers
    • 2 basebands, 1 GHz BW each
    • Up to 16 subband pairs per baseband
    • Independently tunable
    • Independent bandwidths
    • Doppler setting per baseband
    • Baseline board stacking by factors of 2, to give up to 4096 channels per subband
    • Up to 16384 channels total
  • 3-bit samplers
    • 128 MHz subbands, contiguous in frequency within a baseband
    • Up to 64x128 MHz subbands to cover available receiver BW
    • Full, dual, or single polarization to give spectral resolutions 2, 1, 0.5 MHz
general capabilities 2
General Capabilities (2)
  • Phased VLA output for VLBI
    • 8-bit samplers
    • 1 or 2 x 128 MHz subbands, independently phased
    • 256 channels per subband
    • No subarrays or baseline board stacking
    • No simultaneous access to unused correlator resources
  • Subarrays
    • Up to 3 independent subarrays
    • 8-bit samplers, 128 MHz contiguous subbands only
    • Separate SBs for each subarray
    • Observer specifies which antennas go in each subarray
    • Some restrictions on number of antennas per subarray
  • Data rate restrictions for general capabilities
    • 20 MB/s
    • Also limit allowed dump time per array configuration
shared risk capabilities
Shared Risk Capabilities
  • One or two recirculation set-ups that have already been used by RSRO participants
  • Subarrays with 3-bit samplers
  • Fast dump modes up to 60 MB/s (8-bit), dump times >=50ms
  • More than 16 subband pairs per baseband with 8-bit
  • 3-bit with subband BWs narrower than 128 MHz
  • RSRO:
    • OTF mosaics
    • Phased array for all but VLBI
    • Real-timetransient detection
    • Pulsars
    • Complicated subarrays
    • General recirculation set-ups
pst requirements
PST requirements
  • For General and Shared Risk Capabilities, need a mechanism for users to specify their correlator set-up for the July 9 CfP
  • General Capabilities
    • SSS Group will create a special javaws tool that will output correlator configuration information
      • Standard NRAO defaults matching drop-down menu in PST
      • User-defined set-ups that can be uploaded to PST
      • Phased EVLA will be enabled under VLBA resources
  • Shared Risk Capabilities
    • Include in javaws tool, or validate through the RCT and provide resource ID in PST
  • RSRO
    • Free-form text in comment field, as before