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.
The particle receives a focusing kick when passing through the mag- net, x′ 1 =x′ 0 +R21xo +U2111x3
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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.