A dual-ring radially magnetized permanent solenoid produces a 1 T field and focuses 7 MeV electrons with a measured 8.4 cm focal length in agreement with simulations.
For beams with higher energy, U2111 can also be calculated from the field profile following Eq
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Focusing of Relativistic Electron Beams With Permanent Magnetic Solenoid
A dual-ring radially magnetized permanent solenoid produces a 1 T field and focuses 7 MeV electrons with a measured 8.4 cm focal length in agreement with simulations.