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Analytic study of transverse shunt resistance and even-odd mode coupling of a rod type RFQ

机译:棒型RFQ横向分流电阻与奇偶模耦合的解析研究

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To minimize the ohmic power losses, it is necessary to maximize the transverse shunt resistance, R(sub shunt). The cell of a rod-type RFQ is modelled by a parallel two-rod transmission line supported above a parallel ground conductor by two legs. Due to coupling between neighboring supports, the loading impedance is modified depending on the leg spacing. The shunt resistance is improved by reducing the cell length and increasing the leg spacing, and maximized when the legs are equally spaced. However, this is also the condition for strong excitation of the unwanted 'even-mode' in which a potential difference exists between the ends of the rods mid-plane and the grounding conductor or tank, Once the legs of the support are longitudinally separated, some even-mode excitation of the structure is inevitable because some current must be injected into the ground conductor; the even-mode excitation rises as leg separation increases. Further, when the desired odd- mode voltage is symmetric about the cell centre, the even-mode voltage is anti- symmetric This paper is a very much abridged version of two internal design notes(3), (4). (author). 4 refs.,1 fig.

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