20.500.12556/RUL-188446 Merjenje magnetnega polja in histereze dipolnih ter kvadrupolnih magnetov Measurement of magnetic field and hysteresis in dipole and quadrupole magnets Magneti imajo ključno vlogo v pospeševalniških sistemih. Natančno poznavanje lastnosti magnetov nam omogoča učinkovito kontrolo smeri žarkov nabitih delcev. V okviru zaključne naloge smo izbrali primeren magnetometer za nadzor preklopnega magneta na tandemskem pospeševalniku in ga ustrezno opremil, da smo ga lahko integrirali v obstoječi kontrolni sistem pospeševalnika. V nalogi smo izmerili in analizirali histerezo preklopnega dipolnega magneta na pospeševalniku Instituta Jožef Stefan. Raziskali smo, kako ta histereza vpliva na selekcijo ionov v žarkovno linijo. Za meritve smo izdelali namensko ohišje za Hallovo sondo, ki smo jo vstavili v preklopni magnet. Izmerili smo odvisnost gostote magnetnega polja v reži preklopnega magneta v odvisnosti od toka skozi navitje magneta. Iz izmerjenih podatkov smo določili remanentno gostoto magnetnega polja in koercitivni tok. Rezultati kažejo, da ima obravnavani magnet zelo ozko histerezo. Dodatno smo izmerili masni spekter protonskega žarka in molekularnega žarka pri naraščajočem in padajočem toku skozi preklopni magnet in s tem ocenili vpliv histereze na izbiro pravega nabojnega stanja ionskega žarka. Izdelali smo triosno pozicionirno mizico za kartiranje magnetnega polja magneta. Zaradi primanjkljaja magnetometrov smo naredili zgolj simulacijsko meritev za kvadrupolni magnet. Sistem bo ob dobavi novega magnetometra omogočil neposreden prehod na kartiranje magnetnih polj z minimalnimi spremembami. 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. histereza dipolni magnet kvadrupolni magnet Hallov pojav magnetometer masni spekter kartiranje magnetnega polja hysteresis dipole magnet quadrupole magnet Hall effect magnetometer mass spectrum 3D magnetic-field mapping true false false Slovenski jezik Angleški jezik Zaključna naloga 2026-09-23 08:15:06 2026-09-23 08:15:11 2026-09-24 09:31:48 0000-00-00 00:00:00 2026 0 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 165171 292303107 25069.pdf 25069.pdf 1 C3DC93FD0F09CAAC3A1CDFE0AF958992 92c0850f3719068e0911338ded65fe8d7ba94225183556a4a640d01b920e0936 10db7a14-b716-11f1-8bc5-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=248622 Fakulteta za matematiko in fiziko 0 0 0