Science Commissioning

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Presentation transcript:

Science Commissioning EVLA Advisory Committee Meeting, March 19-20, 2009 Mark McKinnon/Claire Chandler EVLA Project Manager/Deputy AD for Science, NM Ops

Objective Describe planning and status of EVLA systems and science commissioning

Systems Commissioning The design, development, and execution of tests and measurements that verify the EVLA antennas, receivers, electronics, correlator, and software perform to project specifications. Has been ongoing since EVLA antenna conversion began Results reported in systems performance talk by Perley Also see correlator talks by Rupen

Science Commissioning The development of procedures needed to: initiate, carry out and complete observations aid the analysis of EVLA astronomical data Has become increasingly important as subsystems have been tested and delivered, and EVLA has reached the critical mass of a full instrument Currently focused on supporting upcoming shared risk observing program (described below) Science commissioning tasks needed to support deliverables through 2012 have been identified, and staff assignments to complete the tasks have been made

Early Science: Shared Risk Observing A program that continues to make the EVLA available to the community via peer-reviewed access while it transitions from a construction project to a fully-operational telescope. Program takes place in 2010-2012. Open Shared Risk Observing (OSRO) Uses WIDAR to provide significant improvements over VLA Only modest bandwidth supported initially [sees talks by Dickman, Chandler, and Rupen for details] Resident Shared Risk Observing (RSRO) Provides full access to WIDAR in return for a period of residency to help with Science Commissioning. Primary objective is to develop wide bandwidth capability of WIDAR in a staged process [see talks by Chandler and Rupen]

Science Commissioning Tasks for OSRO To be completed prior to start of OSRO in Q1 2010. Examples: CASA spectral line and cube analysis Delay calibration procedure for WIDAR Prototype on line helpdesk Bandpass stability tests with WIDAR System temperature calibration Gain curve determination Accurate gain calibration Develop new wideband calibrator models Conduct calibrator survey

Science Commissioning Tasks for RSRO To be completed during OSRO period in 2010-2012 Examples: Wideband, narrow-field imaging of single, unconfused sources Gain calibration for wide bandwidths, weak calibration sources Automatic editing of uv data Narrow-field imaging of single sources with confusing sources Improve reference pointing Polarization calibration: time & frequency dependence