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  ______     ___     _    _      ___      ______  
 /_   _//   / _ \\  | \  / ||   / _ \\   /_   _// 
 `-| |,-   / //\ \\ |  \/  ||  / //\ \\  `-| |,-  
   | ||   |  ___  ||| .  . || |  ___  ||   | ||   
   |_||   |_||  |_|||_|\/|_|| |_||  |_||   |_||   
   `-`'   `-`   `-` `-`  `-`  `-`   `-`    `-`'

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Text this: Stacked dual beam electron optical system for THz integrated wideband traveling wave tube