EVLA Construction Status

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Presentation transcript:

EVLA Construction Status Mark McKinnon EVLA Project Manager

Full frequency coverage from 1 to 50 GHz. Key EVLA Project Goals Fundamental Goal: By building on existing infrastructure, multiply ten-fold the VLA’s observational capabilities. Full frequency coverage from 1 to 50 GHz. 8 frequency bands with cryogenic receivers. Two separately-tunable polarization pairs, with no restrictions on their tuning (unlike current VLA). 1 mJy point-source continuum sensitivity (most bands) New correlator with 8 GHz/polarization capability 16384 minimum channels/baseline with full polarization Full recirculation capability for increased flexibility 128 independently tunable frequency slots. Noise-limited full-beam imaging in all Stokes parameters. SAGE meeting, May 22-23, 2007

Organization Work on EVLA is subdivided into 11 WBS elements EVLA project is embedded within NRAO-NM Operations Benefits from effort contributed by operations But, can be adversely affected by low operations budget EVLA Organization Chart SAGE meeting, May 22-23, 2007

Budget Funding $59M total from NSF @ ~$5M/year through 2011 WIDAR correlator (~$17M) from Canadian partner $2M from Mexican partner ~$16M in NRAO-Ops contributed effort Project contingency In January 2007, contingency increased to highest level in project history (16% of cost to complete) Currently, contingency is estimated at $2.9M (11.3%) Could be as low as $2.2M (8.6%) depending upon outcome of upcoming negotiation on joint software development effort with ALMA Descope Options Not considering at this time Possibilities: Solar mode … $0.2M X-band … $1.0M Ku-band … $1.3M Project contingency, as percent of cost to complete the project, for all actions approved by the control change board as of March 2007 SAGE meeting, May 22-23, 2007

Schedule Coarse schedule: Last antenna - Q2 2010 Correlator operational – Q3 2010 Last receiver (X) - Q3 2013 On track to achieve goal of retrofitting 12 antennas to the EVLA design by Sep 30, 2007 (see Perley talk) Account for over 25% of VLA antenna hours In Sep 2006, accelerated rate for antenna retrofits as schedule recovery measure Correlator delivery paces “real” EVLA capability (see Rupen talk) Install prototype correlator (testing only) – Q2 2008 Begin board installation for final correlator – Q2 2009 Complete installation – Q2 2010 SAGE meeting, May 22-23, 2007

Maintain antenna retrofitting rate EVLA Emphasis in FY2008 Maintain antenna retrofitting rate Potential impact of VLBA tiger team visits in summer 2007 Continue to expedite receiver production Continue focus on C-band OMT and Ka-band receiver for new, early, science capability? Closely monitor correlator progress, and expedite schedule where possible Ensure software delivery is matched to hardware capabilities (see Butler talk) Near term: Monitor and control, observation preparation, and post-processing software for prototype correlator Mid term: Ongoing development of user-facing software Long term: Algorithm development for wide-band, wide-field imaging SAGE meeting, May 22-23, 2007