Photogrammetry Modeling of Scintillating Fiber Detectors in Muon g-2 Experiment

The Muon g-2 Experiment at Fermilab will perform the most precise measurement of the muon's anomalous magnetic moment to date, which could provide evidence of physics outside the standard model. Within the experiment, scintillating "fiber harp" detectors are used to directly measure the motion of the muon beam. Data collected from these harps may be used to tune simulations that compute corrections to the final experiment result. Knowing the locations of the fiber harps more precisely within the vacuum chamber may improve the uncertainties of these corrections. A fixture holding a camera was built and inserted into the vacuum chamber to take hundreds of pictures of the scintillating fiber harps. With these pictures, photogrammetry software was used to construct three dimensional models of the fiber harps. A program was developed to locate the center positions and tilt angles of individual fibers in the 3-D models. The primary focal points of this presentation are the design of the fixture and the process of finding positions with the 3-D models.