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Apertured coaxial tube quadripole lens

阅读:908发布:2022-01-15

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1. A QUADRIPOLE ELECTROSTATIC LENS SYSTEM ADAPTED TO FOCUS A BEAM OF ELECTRICALLY CHARGED PARTICLES ALONG A GIVEN AXIS, COMPRISING A TUBULAR INNER CONDUCTIVE MEMBER LONGITUDINALLY DISPOSED ABOUT SAID BEAM AND HAVING A PAIR OF WINDOWS FORMED IN REGIONS THEREOF WHCIH ARE DIAMTERICALLY DISPOSED RELATIVE TO THE BEAM AXIS, FIELD CONFIGURATION MODIFYING MEANS COMPRISING CONDUCTIVE ELEMENTS PROJECTING FROM SAID INNER MEMVER INTO THE WINDOW AREAS ALONG AXES SUBSTANTIALLY PARALLEL TO SAID BEAM AXIS, AN OUTER CONDUCTIVE MEMBER COAXIAL WITH AND LONGITUDINALLY DISPOSED ABOUT SAID INNER MEMBER AND HAVING OPERATIVE CONDUCTIVE ELEMENTS ARRANGED SUBSTANTIALLY IN JUXTAPOSITION TO AND COVERING SAID WINDOWS AND SAID FIELD MODIFYING MEANS, AND MEANS FOR ESTABLISHING A POTENTIAL DIFFERENCE BETWEEN SAID INNER AND OUTER CONDUCTIVE MEMBERS.
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