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  _____    __   __   __   __     ___      _  __  
 / ____||  \ \\/ //  \ \\/ //   / _ \\   | |/ // 
/ //---`'   \ ` //    \   //   / //\ \\  | ' //  
\ \\___      | ||     / . \\  |  ___  || | . \\  
 \_____||    |_||    /_//\_\\ |_||  |_|| |_|\_\\ 
  `----`     `-`'    `-`  --` `-`   `-`  `-` --`

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Text this: Design of a focused electron beam column for ring-cathode sources