  We propose to enhance the kaon identification capabilities of the GlueX
detector by constructing an FDIRC (Focusing Detection of Internally Reflected
Cherenkov) detector utilizing the decommissioned BaBar DIRC components. The
GlueX FDIRC would significantly enhance the GlueX physics program by allowing
one to search for and study hybrid mesons decaying into kaon final states. Such
systematic studies of kaon final states are essential for inferring the quark
flavor content of hybrid and conventional mesons. The GlueX FDIRC would reuse
one-third of the synthetic fused silica bars that were utilized in the BaBar
DIRC. A new focussing photon camera, read out with large area photodetectors,
would be developed. We propose operating the enhanced GlueX detector in Hall D
for a total of 220 days at an average intensity of 5x10^7 {\gamma}/s, a program
that was conditionally approved by PAC39

Instrumentation and Detectors;High Energy Physics - Experiment