Motivation
 With the advent of
 high-resolution (l/Dl ~ 1000) x-ray spectroscopy
 in the last several years, a wealth of spectroscopic data for
 photoionized sources has been generated, and the level of
 detail and accuracy demanded of models has increased
 dramatically.  
 By producing and measuring a
 well-characterized x-ray photoionized plasma in the laboratory,
 we hope to benchmark the codes used to model x-ray spectra of
 active galactic nuclei, x-ray binaries, and other astrophysical sources
 for which photoionization dominates collisional ionization.