Field free chamber in permanent magnet solenoids
AssigneeThe United States of America as represented by the Secretary of the Army
InventorHerbert A. Leupold
Life of this patent
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Abstract
A low-loss magnetic structure that provides an electron beam focusing field that can be accessed without field reversal. More specifically, the structure provides a uniform magnetic field that can be accessed from an adjacent field-free chamber within which an electron beam source of any size can be housed. The field-free chamber is separated from uniform field by a passive ferromagnet having a hole through which the electron beam can pass. The passive ferromagnet is instrumental in preventing the uniform field from entering the field-free chamber.
Claims5
A low-leakage magnetic structure, comprising:
- a permanent magnet flux source having at least two ends and an internal chamber, said internal chamber containing a uniform magnetic field pointing in a predetermined direction;
- and
- a passive ferromagnet adjacent to a predetermined end of said flux source, said passive ferromagnet forming a field-free chamber having a predetermined size and shape defined by said passive ferromagnet, said field free chamber communicating with said internal chamber of said flux source such that an electron beam can pass from said field-free chamber into said internal chamber without experiencing a field reversal.
Dependencies are inferred from the claim text.