  The PANDA experiment is one of the four large experiments being built at FAIR
in Darmstadt. It will use a cooled antiproton beam on a fixed target within the
momentum range of 1.5 to 15 GeV/c to address questions of strong QCD, where the
coupling constant $\alpha_s \gtrsim 0.3$. The luminosity of up to $2 \cdot
10^{32} cm^{-2}s^{-1}$ and the momentum resolution of the antiproton beam down
to \mbox{$\Delta$p/p = 4$\cdot10^{-5}$} allows for high precision spectroscopy,
especially for rare reaction processes. Above the production threshold for open
charm mesons the production of kaons plays an important role for identifying
the reaction. The DIRC principle allows for a compact particle identification
for charged particles in a hermetic detector, limited in size by the
electromagnetic lead tungstate calorimeter. The Barrel DIRC in the target
spectrometer covers polar angles between $22^\circ$ and $140^\circ$ and will
achieve a pion-kaon separation of 3 standard deviations up to 3.5 GeV/$c$.
Here, results of a test beam are shown for a single radiator bar coupled to a
prism with $33^\circ$ opening angle, both made from synthetic fused silica read
out with a photon detector array with 768 pixels.
