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The development of a fast and accurate method for computing the properties of the helix slow-wave structures used in travelling-wave tubes (TWTs) is described. The calculation uses a sheath helix model in which the shunt capacitance and series inductance are adjusted by constants whose values depend only on the dimensions of the structure. The constant for the capacitance is calculated using a 2D finite difference solution of Laplace’s equation. The constant for the inductance can be inferred from the phase velocity when the phase difference per turn is 180 degrees.
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