Abstract
For a couple of years now RFQ linacs have been designed in our institute using electrodes, which disagree with the ideal shape. Two such linacs proved successful with proton beams, where the electrodes consisted of circular and trapezoidal rods. While such electrodes are easy to manufacture, the determination of the appropriate geometry requires considerable computational efforts. In this paper we present a practicable design process, which only needs a fair amount of computational work. Use is being made of the smooth behaviour of all relevant field harmonics with the linear dimensions of all considered cells occurring. The method is demonstrated by two linac schemes, one consisting of barrel-like the other of trapezoidally shaped rods.
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