Electromagnet for charged-particle apparatus
First Claim
1. An electromagnet for a charged-particle apparatus, comprising:
- a principle coil equipped with at least one pair of coils arranged with an equilibrium orbit for charged particles therebetween and extending along said equilibium orbit;
an iron core composed of return yokes surrounding and extending along said principal core, said return yokes providing a predetermined magnetic field density at both ends of said return yokes, and clamping plates provided at said both ends of said return yokes and having cavities through which said equilibrium orbit for charged particles runs; and
steering magnets each composed of at least a pair of coils which are provided at opposed positions in each of said cavities formed in said clamping plates and which are arranged with said equilibrium for charged particles therebetween.
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Accused Products
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.
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Citations
19 Claims
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1. An electromagnet for a charged-particle apparatus, comprising:
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a principle coil equipped with at least one pair of coils arranged with an equilibrium orbit for charged particles therebetween and extending along said equilibium orbit; an iron core composed of return yokes surrounding and extending along said principal core, said return yokes providing a predetermined magnetic field density at both ends of said return yokes, and clamping plates provided at said both ends of said return yokes and having cavities through which said equilibrium orbit for charged particles runs; and steering magnets each composed of at least a pair of coils which are provided at opposed positions in each of said cavities formed in said clamping plates and which are arranged with said equilibrium for charged particles therebetween. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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- 10. A deflecting electromagnet for a charged-particle apparatus, comprising a principal coil including at least one pair of banana-shaped coils each of which consists of an outer and an inner coil forming a banana-shaped loop extending along an equilibrium orbit for charged particles, the radius of curvature of the outer and inner coils of each of said banana-shaped coils being larger in their end sections than in their middle sections.
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12. An electromagnet for a charged-particle apparatus, comprising;
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a principal coil comprising at least one pair of coils extending along with an equilibrium orbit for charged particles and arranged with said equilibrium orbit therebetween; and an iron core consisting of return yokes which surround and extend along said principal coil and clamping plates provided at both ends of said return yokes, said return yokes having at least one of a thickness which is different at different positions along said equilibrium orbit and gaps provided at predetermined positions along said equilibrium orbit, and said clamping plates having cavities in their respective central sections through which said equilibrium orbit for charged particles runs; the magnetic reluctance of said iron core being different at different positions along said equilibrium orbit. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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Specification