\contentsline {chapter}{\numberline {1}INTRODUCTION}{2}
\contentsline {chapter}{\numberline {2}TECHNICAL OVERVIEW}{5}
\contentsline {section}{\numberline {2.1}Primary Goals for the VLA Expansion}{5}
\contentsline {section}{\numberline {2.2}Components of the Upgrade}{6}
\contentsline {subsection}{\numberline {2.2.1}The Ultra-Sensitive Array}{7}
\contentsline {subsection}{\numberline {2.2.2}The A+ Configuration}{7}
\contentsline {section}{\numberline {2.3}Antenna and Receiver Improvements}{8}
\contentsline {subsection}{\numberline {2.3.1}Improved Low Noise Receivers}{8}
\contentsline {subsection}{\numberline {2.3.2}New Observing Bands at the Cassegrain Focus}{8}
\contentsline {subsection}{\numberline {2.3.3}New Prime Focus Systems}{9}
\contentsline {subsection}{\numberline {2.3.4}Sensitivity Goals}{10}
\contentsline {section}{\numberline {2.4}A New LO/IF Transmission System}{10}
\contentsline {section}{\numberline {2.5}A New Correlator}{11}
\contentsline {section}{\numberline {2.6}Improved Surface-Brightness Sensitivity}{13}
\contentsline {section}{\numberline {2.7}High Angular Resolution---The A+ Configuration}{14}
\contentsline {subsection}{\numberline {2.7.1}Example imaging with the A+ configuration}{17}
\contentsline {section}{\numberline {2.8}On-Line Computing}{19}
\contentsline {section}{\numberline {2.9}Other Capabilities}{19}
\contentsline {chapter}{\numberline {3}NEW SCIENCE WITH THE ENHANCED VLA}{20}
\contentsline {section}{\numberline {3.1}Imaging-Spectroscopy of Solar Radio Bursts}{20}
\contentsline {section}{\numberline {3.2}Bistatic Radar Observations of Planets and Minor Bodies}{21}
\contentsline {section}{\numberline {3.3}High-resolution Imaging of Thermal Emission}{21}
\contentsline {section}{\numberline {3.4}Imaging Protoplanetary Disks}{21}
\contentsline {section}{\numberline {3.5}Transient Phenomena}{22}
\contentsline {section}{\numberline {3.6}Extragalactic Surveys}{22}
\contentsline {section}{\numberline {3.7}Clusters of Galaxies}{23}
\contentsline {section}{\numberline {3.8}Objects at High Redshift}{24}