My research focus is to fi�nd out where and at what rates in the plasma charged fusion products are created, an emission profile. A prototype diagnostic, or instrument, was designed, constructed, assembled, and installed in the Mega Amp Spherical Tokamak (MAST) in the Culham Centre for Fusion Energy (CCFE) in the United Kingdom for data collection. Subsequent data analysis will be used to reconstruct the time-dependent charged fusion product profile from deuterium-deuterium reactions in the plasma. This will allow studies of plasma instabilities (such as toridal Alfven eigenmodes and fi�shbones). Plasma instability studies become vital to reduce hindrances on plasma performance so as not to impede efficient fusion energy production. The Proton Detector (or Charged Fusion Products Diagnostic) provides the foundation for future fast ion research in spherical tokamaks, especially as these devices upgrade to higher density plasmas.