Simulations and measurements of the dipole magnet using in the 4-MeV electron spectrometer

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A dipole magnet is one of important components in particle accelerators. It can be used to transport a charged particle beam with desired deflecting angle and direction. Moreover, it is often utilized as a part of an energy spectrometer. This research focuses on simulations and measurements of the dipole magnet, which will be used to measure the electron beam energy produced from the 4-MeV radio-frequency (RF) linear accelerator (linac) for natural rubber vulcanization at the PBP-CMU Electron Linac Laboratory of the Plasma and Beam Physics (PBP) Research Facility in Chiang Mai University (CMU). The research activities are divided into three main parts. The first part focuses on three-dimensional (3D) simulation of the dipole magnet by using the RADIA program. The 3D field map of the magnetic field can be derived from the RADIA model. The second past is the magnetic field measurements of the magnet after the construction. The maximum magnetic field of 248.6 mT can be obtained with an excitation current of 3 A. The last part focuses on the electron beam dynamic study by using the program called ASTRA to track the particles though the 3D magnetic field distribution. The simulation data provides six-dimensional coordinates of the particles at the considered position downstream the dipole magnet. The optimal bending angle of the 4-MeV electron beam in the magnetic field of 0.22 T is 50° with an energy spread of 0.827 MeV.