Wedged-pole hybrid undulator

Details Wedged-pole hybrid undulator Wedged-pole hybrid undulator

1987-09-30

1991-05-28

Harris, George

Electricity: magnetically operated switches, magnets, and electr

Magnets and electromagnets

Electron or ion beam deflecting type

335306, 315 535, H01F 700

Patent

active

050198637

ABSTRACT:
A hybrid undulator made from axial arrays of rare-earth permanent magnets and highly permeable pole pieces. The pole pieces and magnets are wedge-shaped, with the same wedge angle, and fit together with the wedge angle of the magnets directed away from the axis and the wedge angle of the pole pieces directed toward the axis. The pole pieces can extend closer to the axis than the magnets. The wedged-pole undulator produces increased on-axis magnetic fields, and the wedge angle can be chosen to prevent magnetic field saturation inside the pole pieces.

REFERENCES:
patent: 4647887 (1987-03-01), Leupold
patent: 4654618 (1987-03-01), Leupold
patent: 4731598 (1988-03-01), Clarke
Halbach, K., Nuclear Instruments and Methods in Physics Research, A250 (1986), pp. 115-119, "Some Concepts to Improve the Performance of DC Electromagnetic Wigglers" (North-Holland, Amsterdam).
Walker, R. P., Nuclear Instruments and Methods in Physics Research, A237 (1985), pp. 366-380, "Periodic Magnets for Free Electron Lasers" (North-Holland, Amsterdam).

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