Development of a Beam Trajectory Monitoring System Using e+/e− Pair Production EventsShota KIMURA, Yusaku EMOTO, Kento FUJIHARA, Hiroshi ITO, Hideyuki KAWAI, Atsushi KOBAYASHI and Takahiro MIZUNOEPJ Web Conf., 170 (2018) 09007DOI: https://doi.org/10.1051/epjconf/201817009007