Evaluation of Systematic Effects for the NPDGamma Experiment

The NPDGamma experiment proposes to search for the parity-odd correlation between the neutron polarization and the direction of gamma emission in polarized neutron-proton capture with a sensitivity at the level of $10^{-8}$ for the amplitude of the asymmetry. An extensive set of systematic effects could contaminate the asymmetry if not properly suppressed. In the course of several measurements conducted on FP12 at LANSCE, the NPDGamma collaboration has placed upper bounds on some systematic effects, has demonstrated methods of discovering other systematic effects in a time short compared to the running time required to achieve the statistical accuracy goal, and has verified that yet other classes of possible systematic effects are adequately suppressed by the design and properties of the apparatus. In this talk we will present an extensive list of possible systematic effects and show our current upper bounds on their size.