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Segment control structure of a cathode with field emission and a method for dynamically correcting the shape of an electron beam
Segment control structure of a cathode with field emission and a method for dynamically correcting the shape of an electron beam
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机译:具有场发射的阴极的段控制结构和动态校正电子束形状的方法
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摘要
A field emission cathode providing for dynamic adjustment of beam shape is disclosed. Beam shape adjustment is accomplished by segmenting the gate electrode of a gated field emission cathode and independently driving the various gate segments to form the desired beam shape. Segments can be turned on and off as the beam is deflected allowing dynamic correction of aberrations in the beam. A focus lens can be placed on the gated cathode to produce a parallel electron beam. In addition, a hollow cathode can be produced to minimize space charge repulsion in a beam.
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