For a 10 MeV technological accelerator, a dipole magnet with a permanent magnetic field was created using the SmCo alloy. The maximum magnetic field in the magnet gap was 0.3 T. The magnet is designed to measure the energy of the beam and to adjust the accelerator for a given energy. For a linear accelerator with an energy of 23 MeV, a dipole magnet based on the Nd-Fe-B alloy was developed and fabricated. It was designed to rotate the electron beam at a 90 degrees. The magnetic field in the dipole magnet along the path of the beam was 0.5 T. The effective length of the magnet was 242 mm.
Nd-Fe-B and Sm-Co magnets were irradiated by electron beam with the energy of 10 MeV and bremsstrahlung. The absorbed dose was 16 and 160 Grad. It was found that magnetic flux of Nd-Fe-B magnets decrease with irradiation, whereas Sm-Co magnets keeps magnetic performance.
The paper presents an overview of up-to-date design and conception of permanent magnet quadrupole lense. The overview covers two classes of magnetic systems that used in the beam transport facilities of accelerators as quadrupoles with fixed gradient and lenses with the field tuning in the wide range.
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