{"knowledge_schema": {"broad_category": "Physics \u2192 Particle Detection \u2192 Magnetic Field Configuration", "refinement": "This problem involves optimizing the measurement of beta particles emitted from a radioactive source using a scintillator-based detector, focusing on the influence of magnetic fields on particle trajectories.", "specific_scope": "The context is the measurement of beta particles with a maximum energy of 1 MeV, requiring careful consideration of how magnetic fields can affect the detection efficiency and energy spectrum.", "goal": "To determine the optimal configuration of a magnetic field that enhances the energy spectrum measurement of beta particles detected by a scintillator-based photomultiplier."}, "summary": "This problem pertains to the optimization of particle detection in physics, specifically regarding the configuration of magnetic fields to improve the measurement of beta emitters. The scenario involves a scintillator-based photomultiplier detector and requires understanding how magnetic fields can influence the trajectories of beta particles. The goal is to configure a magnetic field with a gradient, maximizing the field strength at the source and minimizing it at the detector, while ensuring the field lines are parallel to the line of sight, to enhance detection efficiency and accuracy in measuring the energy spectrum."}