Magnetic Field Control and Trajectory Modeling for 100keV to 1 MeV Electron Accelerator

High precision beta decay experiments, such as the Nab experiment at Oak Ridge National Laboratory, require meticulously calibrated detector systems. An electron accelerator is being developed at the Triangle Universities Nuclear Laboratory with a designed operating range from 100 kV to 1 MV to characterize detectors for these experiments. Deflections due stray magnetic fields and earth's field complicate beam extraction and make reliable collimation more challenging, especially at the lower energy range. To address this issue, and to develop beam transport for the experiments, we have implemented a detailed trajectory model in Kassiopeia and used it to design coils to cancel Earth's field along the electron trajectories. We report on the status of our trajectory modeling to optimize beam extraction near the photocathode and the implementation of coils to cancel earth's field for our accelerator system.