| 摘要 |
In a linear accelerator which accelerates a beam of charged particles along a beam axis and which comprises a conductive cylinder defining a hollow space, first through fourth conductive vanes are arranged clockwise in the hollow space around the beam axis with an azimuthal interval of 90 DEG left between two adjacent ones of the vanes and are electrically connected to the conductive cylinder so as to be excited by a TE11N mode on supply of electric power to the conductive cylinder and to induce a quadrupole electric field among the first through the fourth conductive vanes where N is one of 0, 1, 2, . . . . In the TE11N mode, (N+1) sets of excitation members are arranged each of which is composed of first and second conductive plates opposite to each other and projected towards the beam axis, a first intermediate conductive member connected to two of the first through the fourth conductive vanes, and a second intermediate conductive member connected to the remaining conductive vanes.
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