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General Science / How to build electron gun?
« on: 21/10/2009 05:15:13 »How about this diagram? Does it need vacuum?Yes vacuum is must for e-beam. To know more about this try to know something about Scanning Electron Microscope.
There are many reasons for requiring a vacuum in an SEM. If the filament were surrounded by air, it would quickly burn out, like a light bulb. If the column were full of air, the electrons would collide with the gas molecules.