Laser measurements of distances from the ORELA neutron target to experiment stations along flight paths 1 and 6

Flight path lengths were measured by laser techniques for the 200, 80, and 18 m stations along flight path 1, and for the 5, 20, 40, and 150 m stations along flight path 6 at the Oak Ridge Electron Linear Accelerator (ORELA). In each case the distance evaluated from the measurements is the slope distance from the center of the neutron producing target to a position along the beam path, directly above a suitable benchmark at the experiment station. A total of 25 laser measurements were performed between the various stations. These data, along with appropriate uncertainties, were combined using Bayes' method. From this analysis was obtained the desired flight path lengths, which typically have uncertainties less than 1.5 mm. The measurement technique, uncertainties, analysis method, and results are documented in detail in this report.