The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 07, 1986
Filed:
Jul. 26, 1985
Harry Naylor, Richmond, NZ;
Kenneth H Purser, Manchester, MA (US);
General Ionex Corporation, Newburyport, MA (US);
Abstract
Apparatus for generating negative ions, specifically He.sup.- ions. Positive ions at a predetermined energy level from a conventional ion source are directed to a permanent magnet channel that utilizes two, spaced permanent magnet assemblies to analyze the ions and, with double focusing, to direct them to a focal point located in a lithium vapor canal. As the positive ion beam passes through a lithium vapor of constant density in a predetermined volume at the central region of the canal, electrons transfer to the ions and produce He.sup.- ions. The canal is constructed to efficiently condense and collect lithium vapor as it escapes the predetermined volume. The beam of negative ions then passes to another permanent magnet assembly that corrects any astigmatism in the emerging beam and that directs the beam, with appropriate optical properties, onto an injection axis for another accelerating structure.