Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – Electron or ion beam deflecting type
Patent
1990-01-11
1992-05-26
Picard, Leo P.
Electricity: magnetically operated switches, magnets, and electr
Magnets and electromagnets
Electron or ion beam deflecting type
335299, 335297, H01F 700
Patent
active
051172127
ABSTRACT:
An electromagnet for a charged-particle apparatus. The electromagnet of the first form of this invention may consist of a deflecting electromagnet comprising an iron core equipped with clamping plates having cavities through which a vacuum chamber runs. Provided in these cavities are small-sized coils using the iron core as the magnetic path and adapted to adjust the orbit for charged particles. The electromagnet of the second form of this invention consists of a deflecting electromagnet equipped with a banana-shaped principal coil whose radius of curvature is larger in its end sections than in its middle section, thereby leveling the magnetic-field distribution on the equilibrium orbit. In the electromagnet of the third form of this invention, the thickness of the iron core, surrounding the principal coil, is different at different positions along the equilibrium orbit for charged particles, thereby making it possible to obtain some desired magnetic-field distribution. The first and third forms of the electromagnet, in particular, are not restricted to a deflecting electromagnet in a charged-particle apparatus but is applicable to other types of electromagnets in a charged-particle apparatus.
REFERENCES:
patent: 3681599 (1972-08-01), Takumi
patent: 4737727 (1988-04-01), Yamada
patent: 4769623 (1988-09-01), Marshing
patent: 4887059 (1989-12-01), Asano
patent: 4902993 (1990-02-01), Krevet
Yamada Tadatoshi
Yamamoto Shunji
Korka Trinidad
Mitsubishi Denki & Kabushiki Kaisha
Picard Leo P.
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