What is electrostatic focusing?
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an electrostatic lens is a device that assists in the transport of charged particle.... An electrostatic lens also used to be focus an ion beam for example to make an ion beam for irradiating individual cells
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The electron path is bent at each equipotential surface in the same way as light ray is bent at an optical boundary. A simple electrostatic lens consist of to coaxial short cylindrical metal tubes T1 and T2 separated by small distance.
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