  In this article we describe the design, construction and implementation of
our ion-atom hybrid system incorporating a high resolution time of flight mass
spectrometer (TOFMS). Potassium atoms ($^{39}$K) in a Magneto Optical Trap
(MOT) and laser cooled calcium ions ($^{40}$Ca$^+$) in a linear Paul trap are
spatially overlapped and the combined trap is integrated with a TOFMS for
radial extraction and detection of reaction products. We also present some
experimental results showing interactions between $^{39}$K$^+$ and $^{39}$K,
$^{40}$Ca$^+$ and $^{39}$K$^+$ as well as $^{40}$Ca$^+$ and $^{39}$K pairs.
Finally, we discuss prospects for cooling CaH$^+$ molecular ions in the hybrid
ion-atom system.
