Magnetic filter for ion source
First Claim
1. A magnetic filter (90) for an ion source (26) comprising a housing defining a plasma confinement chamber (76) in which a plasma including ions is generated by ionizing a source material, the housing including a generally planar wall (50) in which are formed a plurality of elongated apertures (64) through which an ion beam (84) may be extracted from the plasma, the plurality of elongated openings oriented substantially parallel to each other and to a first axis (66) which lies within said planar wall, the first axis being substantially orthogonal to a second axis (68) which lies within the planar wall;
- said magnetic filter comprising;
a plurality of elongated magnets (90a-90n) disposed within the plasma confinement chamber (76) for separating the plasma confinement chamber into a primary region (86) and a secondary region (88), said plurality of elongated magnets being oriented neither parallel to nor orthogonal to said second axis (68) but instead oriented at an acute angle θ
as measured from said second axis (68) and lying parallel to each other and within a plane which is generally parallel to the generally planar wall (50).
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0 Petitions
Accused Products
Abstract
A magnetic filter (90) for an ion source (26) is provided. The ion source comprises a housing defining a plasma confinement chamber (76) in which a plasma including ions is generated by ionizing a source material. The housing includes a generally planar wall (50) in which are formed a plurality of elongated apertures (64) through which an ion beam (84) may be extracted from the plasma. The plurality of elongated openings are oriented substantially parallel to each other and to a first axis (66) which lies within the planar wall the first axis being substantially orthogonal to a second axis (68) which also lies within the planar wall. The magnetic filter (90) is disposed within the plasma confinement chamber (76). The magnetic filter separates the plasma confinement chamber into a primary region (86) and a secondary region (88). The magnetic filter comprises a plurality of parallel elongated magnets (90a-90n), oriented at an angle θ as measured from the second axis (68), and lying in a plane which is generally parallel to the generally planar wall (50).
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Citations
18 Claims
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1. A magnetic filter (90) for an ion source (26) comprising a housing defining a plasma confinement chamber (76) in which a plasma including ions is generated by ionizing a source material, the housing including a generally planar wall (50) in which are formed a plurality of elongated apertures (64) through which an ion beam (84) may be extracted from the plasma, the plurality of elongated openings oriented substantially parallel to each other and to a first axis (66) which lies within said planar wall, the first axis being substantially orthogonal to a second axis (68) which lies within the planar wall;
- said magnetic filter comprising;
a plurality of elongated magnets (90a-90n) disposed within the plasma confinement chamber (76) for separating the plasma confinement chamber into a primary region (86) and a secondary region (88), said plurality of elongated magnets being oriented neither parallel to nor orthogonal to said second axis (68) but instead oriented at an acute angle θ
as measured from said second axis (68) and lying parallel to each other and within a plane which is generally parallel to the generally planar wall (50). - View Dependent Claims (2, 3, 4, 5)
- said magnetic filter comprising;
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6. An ion source (26), comprising:
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a housing defining a plasma confinement chamber (76) in which a plasma including ions is generated by ionizing a source material, said housing including a generally planar wall (50) in which are formed a plurality of elongated apertures (64) through which an ion beam (84) may be extracted from the plasma, said plurality of elongated openings oriented substantially parallel to each other and to a first axis (66) which lies within said planar wall, said first axis being substantially orthogonal to a second axis (68) which lies within said planar wall; and a magnetic filter (90) disposed within said plasma confinement chamber for separating said plasma confinement chamber (76) into a primary region (86) and a secondary region (88), said magnetic filter comprising a plurality of elongated magnets (90a-90n) oriented neither parallel to nor orthogonal to said second axis (68) but instead oriented at an acute angle θ
as measured from said second axis (68) and lying parallel to each other and within a plane which is generally parallel to said generally planar wall (50). - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14)
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15. A magnetic filter (90) for an ion source (26) comprising a housing defining a plasma confinement chamber (76) in which a plasma including ions is generated by ionizing a source material, the housing including a generally planar wall (50) in which are formed a plurality of elongated apertures (64) through which an ion beam (84) may be extracted from the plasma, the plurality of elongated openings oriented substantially parallel to each other and to a first axis (66) which lies within said planar wall, the first axis being substantially orthogonal to a second axis (68) which lies within the planar wall;
- said magnetic filter comprising;
a plurality of elongated magnets (90a-90n) disposed within the plasma confinement chamber (76) for separating the plasma confinement chamber into a primary region (86) and a secondary region (88), each of said plurality of magnets being oriented at an angle θ
as measured from said second axis (68) and lying parallel to each other and within a plane which is generally parallel to the generally planar wall (50);wherein said plurality of elongated apertures (64) equals N apertures, adjacent apertures of said plurality of elongated apertures are each separated by a distance D, and adjacent magnets of said plurality of elongated magnets (90a-90n) are each separated by distance L as measured parallel to said first axis (66), said angle θ
being generally defined by the equation;
L/D=N×
(tan θ
). - View Dependent Claims (16)
- said magnetic filter comprising;
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17. An ion source (26), comprising:
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a housing defining a plasma confinement chamber (76) in which a plasma including ions is generated by ionizing a source material, said housing including a generally planar wall (50) in which are formed a plurality of elongated apertures (64) through which an ion beam (84) may be extracted from the plasma, said plurality of elongated openings oriented substantially parallel to each other and to a first axis (66) which lies within said planar wall, said first axis being substantially orthogonal to a second axis (68) which lies within said planar wall; and a magnetic filter (90) disposed within said plasma confinement chamber for separating said plasma confinement chamber (76) into a primary region (86) and a secondary region (88), said magnetic filter comprising a plurality of elongated magnets (90a-90n) each oriented at an angle θ
as measured from said second axis (68) and lying parallel to each other and within a plane which is generally parallel to said generally planar wall (50);wherein said plurality of elongated apertures (64) equals N apertures, adjacent apertures of said plurality of elongated apertures are each separated by a distance D, and adjacent magnets of said plurality of elongated magnets (90a-90n) are each separated by distance L as measured parallel to said first axis (66), said angle θ
being generally defined by the equation;
L/D=N×
(tan θ
). - View Dependent Claims (18)
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Specification