Performance of the Cylindrical Drift Chamber and the Inner Plastic Scintillator in the BGOegg experiment*

Properties of vector mesons, such as $\omega$ mesons, in nucleus are intensively measured to study interactions between mesons and nuclear medium. To study $\omega$ meson properties in nuclei, we search for the nuclear $\omega$ bound states in the LEPS2/BGOegg experiment at SPring-8. If a strongly bounded $\omega$ state exists and binding energy is measured, it gives a phenomenological information about interactions between $\omega$ meson and nuclei. $\omega$ meson is produced using the GeV $\gamma$ rays at SPring-8/LEPS2 beamline. The $\omega$ bound state is searched from the missing mass measurements of forward going protons. $\omega$ meson production is identified by detecting $\gamma$ and proton from $\omega$N $\to$ $N^{\ast}$ $\to$ $\gamma$p or $\omega$N $\to$ $\gamma\Delta$ $\to$ $\gamma\pi$p reaction. In the BGOegg experiment, charged particles are detected by Cylindrical Drift Chamber(CDC) and Inner Plastic Scintillators(IPS) around the target. CDC has 4 layers of stereo wires and each layer has 72 sense wires. IPS consists of 30 plastic scintillators. In this talk, the performance of CDC and IPS are described in detail.