Study of St. George Beam Position and Energy Diagnostics

The St. George Recoil Separator at the Nuclear Science Laboratory of the University of Notre Dame is a powerful tool for measuring (α, γ) reactions, which have high relevance in astrophysics. In order to achieve optimal performance, it is critical to have understandings of the properties of the beam, specifically 1) beam profile after the accelerator, 2) beam position within St. George, and 3) precise energy of the beam, to guarantee the reproducibility of experiments. We will present the signal processing software of the beam position system that we implemented to extract key position information, as well as the energy calibration of the accelerator analyzing magnet over a large p/q and mass range. Preliminary position sensitivity studies of the St. George detection system will also be discussed.