The GlueX experiment was designed to search for and study the pattern of
gluonic excitations in the meson spectrum produced through photoproduction
reactions at a new tagged photon beam facility in Hall D at Jefferson
Laboratory. The particle identification capabilities of the GlueX experiment
will be enhanced by constructing a DIRC (Detection of Internally Reflected
Cherenkov light) detector, utilizing components of the decommissioned BaBar
DIRC. The DIRC will allow systematic studies of kaon final states that are
essential for inferring the quark flavor content of both hybrid and
conventional mesons. The design for the GlueX DIRC is presented, including the
new expansion volumes that are currently under development.Comment: 8 pages, 6 figure
