  Hot cavity resonant ionization laser ion sources (RILIS) provide a multitude
of radioactive ion beams with high ionization efficiency and element selective
ionization. However, in hot cavity RILIS there still remains isobaric
contaminations in the extracted beam from surface ionized species. An ion
guide-laser ion source (IG-LIS) has been implemented that decouples the hot
isotope production region from the laser ionization volume. A number of IG-LIS
runs have been conducted to provide isobar free radioactive ion beams for
experiments. Isobar suppression of up to 106 has been achieved, however, IG-LIS
still suffers from an intensity loss of 50-100X as compared to hot cavity
RILIS. Operating parameters for IG-LIS are being optimized and design
improvements are being implemented into the prototype for robust and efficient
on-line operation. Recent SIMION ion optics simulation results and the ongoing
development status of the IG-LIS are presented.
