| 摘要 |
In an accelerator for accelerating charged particles by using electro-magnetic wave, in which a plurality of cells are disposed periodically, a washer-shaped electrode separated from the cylinder wall is located at the boundary of each of the cells, which electrode has a hole, through which accelerated charged particles pass, at its center portion and an approximately uniform thickness. The thickness and the diameter of said washer-shaped electrode and the gap between said washer-shaped electrode and the inner surface of said cylinder are so chosen that the average strength of the accelerating electric field is highest. The peak strengths of the electric field are approximately equal at the outer and inner peripheral portions of said washer-shaped electrode.
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