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Modifications to a slow-wave structure (SWS) consisting of a planar helix with straight-edge connections are proposed so as to avoid dielectric charging problem when it is used in a traveling-wave tube (TWT). The planar helix SWS is suitable for microfabrication using materials such as silicon (Si) and silicon dioxide (SiO2). First, through a simple dielectric slab model, it is shown that the phenomenon...
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