1. A ring lens for focusing ion beams to uniform densities
- Author
-
Cleland H. Johnson
- Subjects
Physics ,Simple lens ,Ion beam ,Einzel lens ,business.industry ,General Medicine ,law.invention ,Lens (optics) ,Optics ,law ,Magnetic lens ,Atomic physics ,Axial symmetry ,business ,Beam (structure) ,Electrostatic lens - Abstract
An electrostatic lens is designed and built to focus a beam of positive ions into uniform density on a target. The lens has two concentric field regions with a grid separating the inner zero field from the outer radial field. For proper operation the incident ions must emanate with axial symmetry and Gaussian or similar divergence from a small source. An appendix is included on the symmetrization of elliptical beams by a quadrupole singlet lens.
- Published
- 1975
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