Fig. 6. Projection of electron trajectories on the r-<£ plane. the device at 1.8-MW input. These also show the output-cavity outline, and the output-cavity beam-focusing fields. The very narrow beam bunching shows clearly on the r-, <£-plane projection. The static, magnetic, compensating field is not shown, but is roughly 200 G in the negative theta direction. Overcompensation here seems to produce improved efficiency. In the 1.8-MW simulation, tube parameters include 70-kW drive power, an output-cavity Q over 11,000, an initial beam radius of 4 mm, a deflection angle of 11.9°, and an output power of 1.55 MW. Output power is taken from pairs of output lines with internal separations of 90° in each pair. The phasing of paired outputs is necessary to maintain the correct output-cavity traveling wave. We have also made a series of simulations of a tube of 1.8-MW input power at several frequencies. The graph of overall efficiency versus frequency (Figure 9) shows a slow rise in efficiency as the frequency is lowered. 3. POTENTIAL PROBLEMS AND IMPROVEMENTS A. Deflection System The large drive power requirements are an obvious handicap. They correspond to
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