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US 10,998,158 B1Granted
Variable-focus magnetostatic lens
AssigneeTriad National Security, LLC
InventorsJohn Lewellen, Kimberley Nichols, Heather Andrews, Ryan Fleming
Life of this patent
Estimating the term…
Abstract
Variable-focus solenoidal lenses for charged particle beams with integrated emittance filtering are disclosed. The emittance may be controlled via selection of collimating irises. The focal length may be changed by altering the spacing between two permanent ring magnets.
Claims19
An apparatus, comprising:
- a first permanent ring magnet generating a field oriented in a first direction and a second permanent ring magnet generating a field oriented in a second direction that is opposite to the first direction, the first permanent ring magnet and the second permanent ring magnet each comprising an opening through which an electron beam can pass;
- and
- a first collimator plate comprising a collimating iris that is positioned between the first permanent ring magnet and the second permanent ring magnet, or positioned outside of the first permanent ring magnet and or the second permanent ring magnet, wherein
- in operation of the apparatus, the electron beam passes through the opening of the first permanent ring magnet and the opening of the second permanent ring magnet.
1 more element
A variable-focus magnetostatic lens, comprising:
- a first permanent ring magnet generating a field oriented in a first direction and a second permanent ring magnet generating a field oriented in a second direction that is opposite to the first direction, the first permanent ring magnet and the second permanent ring magnet each comprising an opening through which an electron beam can pass;
- and
- a pair of magnetically permeable yokes, each magnetically permeable yoke surrounding one of the first permanent ring magnet and the second permanent ring magnet, wherein
- in operation of the variable-focus magnetostatic lens, the electron beam passes through the opening of the first permanent ring magnet and the opening of the second permanent ring magnet.
1 more element
A variable-focus magnetostatic lens with an adjustable focus and magnetic field strength, comprising:
- a first permanent ring magnet generating a field oriented in a first direction and a second permanent ring magnet generating a field oriented in a second direction that is opposite to the first direction, the first permanent ring magnet and the second permanent ring magnet each comprising an opening through which an electron beam can pass;
- a pair of magnetically permeable yokes, each magnetically permeable yoke surrounding one of the first permanent ring magnet and the second permanent ring magnet;
- and
- a first collimator plate comprising a first collimating iris that is positioned between the first permanent ring magnet and the second permanent ring magnet, or positioned outside of the first permanent ring magnet and or the second permanent ring magnet.
1 more element
Dependencies are inferred from the claim text.