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The hyperbolic potential distribution of a quadripole amplifier (Adler et al.) is usually assumed to be produced by hyperbolic metal plates running along equipotential lines. It is shown that, to an approximation, the required field shape in the region occupied by the beam can be produced by four cylindrical poles. Equations are given for deriving the exact field shape. (D.L.C.)
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TUFFELL et al. (1961) studied this question.
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