The Expanded Very Large Array (EVLA) is an international project to improve the scientific capabilities of the Very
Large Array (VLA), an aperture synthesis radio telescope consisting of 27, 25-meter diameter antennas distributed in a
Y-shaped configuration on the Plains of San Augustin in west-central New Mexico. The EVLA's major science themes
include measuring the strength and topology of magnetic fields, enabling unbiased surveys and imaging of dust-shrouded
objects that are obscured at other wavelengths, enabling rapid response to and imaging of rapidly evolving transient
sources, and tracking the formation and evolution of objects in the universe. The EVLA's primary technical elements
include new or upgraded receivers for continuous frequency coverage from 1 to 50 GHz, new local oscillator,
intermediate frequency, and wide bandwidth data transmission systems to carry signals with 16 GHz total bandwidth
from each antenna, and a new digital correlator with the capability to process this bandwidth with an unprecedented
number of frequency channels for an imaging array. The project also includes a new monitor and control system and new
software that will provide telescope ease of use. The project was started in 2001 and is on schedule and within budget.
Scientific observations with the new correlator started in March 2010. The structural modifications that convert the VLA
antennas to the EVLA design were completed in May 2010. The project will be complete in December 2012 when the
last receiver will be installed on an antenna.