Focusing Permanent-Magnet Undulator
Instruments & Instrumentation; Nuclear Science & Technology; Physics, ; Particles & Fields; Spectroscopy
A plane polarized undulator does not have the ability to focus an electron beam in the undulating plane (X-Z plane) because the magnetic field decreases away from the X-axis. To focus in the bending plane, a quadrupole field must be added to the undulating field. This can be achieved using curved magnets or trapezoid-shaped magnets. In this article, we analyze a few magnet configurations which produce X-Z focusing. It has been found that semicircular magnets or trapezoid magnets having 1.2-degrees angle are suitable as focusing permanent magnet undulator.
Nuclear Instruments & Methods in Physics Research Section a-Accelerators Spectrometers Detectors and Associated Equipment
Article; Proceedings Paper
Tsunawaki, Y.; Ohigashi, N.; Mima, K.; Akiba, T.; Kuruma, S.; Imasaki, K.; Nakai, S.; and Elias, L. R., "Focusing Permanent-Magnet Undulator" (1991). Faculty Bibliography. 2100.