Magnets play a crucial role in accelerator systems. A good understanding of their properties enables precise control of particle trajectories in accelerators. The main goal of this thesis was to introduce a magnetometer into the accelerator system and to measure the hysteresis and magnetic fields of the accelerator magnets. In this work, we measured and analyzed the hysteresis of a switching dipole magnet on the accelerator at the Jožef Stefan Institute and investigated how this hysteresis affects ion selection in the beamlines.
For the measurements, we fabricated a dedicated housing for the Hall probe, which was inserted into the magnet and its readout electronics integrated in to the control system of accelerator. We measured the dependence of the magnetic field density in the gap of the switching magnet and the current through the magnet coils. From the measured data, we determined the remanent magnetic flux density and the coercive current. The results indicate that the investigated magnet has exeptionally narrow hysteresis. Additionally, we measured the mass spectrum of a proton beam and a molecular beam during increasing and decreasing current through the switching magnet to examine the hysteresis influence on the coil beam selection.
As part of this work, we also built a three-axis positioning stage for mapping the magnetic field of a real magnet. Due to a shortage of magnetometers, we only performed a simulation measurement for a quadrupole magnet. The simulation confirmed the status of the developed system. Upon delivery of additional magnetometer, it will allow mapping of magnetic fields with minimal changes.
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