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Excitation of a slow wave structure
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View: Figures


Image of FIG. 1.
FIG. 1.

Slow wave structure, excited by an ideal current source.

Image of FIG. 2.
FIG. 2.

Schematic drawing of the cold-tube dispersion relation ωm (β). The lowest three radial modes are shown.

Image of FIG. 3.
FIG. 3.

The frequency response as a function of ωL/c for the following parameters: b/L = 6.0, h/L = 6.0, a/L = 5.8, β 0 L = π/2.

Image of FIG. 4.
FIG. 4.

Simulation geometry.

Image of FIG. 5.
FIG. 5.

Normalized simulation amplitude data for ωL/c values of 0.140 to 1.300. The m = 1, 2, and 3 peaks are depicted (with the m = 1 peak being the leftmost peak).

Image of FIG. 6.
FIG. 6.

Pseudocolor plot of the Y component of the electric field. Plots corresponding to the m = 1 (a), m = 2 (b), and m = 3 (c) mode. Peaks are provided along with a grid plot of the simulated slow wave structure (d). Scale multipliers for (a), (b), and (c) are 1 × 105 V/m, 5 × 104 V/m, and 4 × 104 V/m, respectively.

Image of FIG. 7.
FIG. 7.

Comparison of the frequency response in the analytic theory (left curves) and ICEPIC simulation (right curves), for the m = 1, 2, and 3 modes (top to bottom). The values of Q are chosen so that the peak response in the analytic theory matches that of the ICEPIC simulation for each m-mode.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Excitation of a slow wave structure