Abstract
Current bunching calculations based on the disk electron model are used to determine the effect of drift length, beam radius, and beam perveance on the power conversion efficiency of a two-cavity klystron. In a 2.5 × 10-6perveance klystron, a loss in power output exceeding one decibel results when a drift length shorter than 0.08λ q is used. Power conversion efficiency is found to be reduced by 5 to 10 points in beams where normalized beam radius \gamma b lies in the range from 0.3 to 0.1. The loss of efficiency due to perveance in an optimum klystron design is found to be given approximately by the expression \Delta_{\eta}=0.0606 \sqrt {\mu}{P} , where Δ η is expressed in percentage points, and \mu P is the microperveance of the beam. In a 2.5 × 10-6perveance beam, the power conversion efficiency is reduced by ten percentage points from its ballistic value of 58.2 percent, indicating that previously published work is in error by a factor of two.
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