The paper presents the results of the development of short five-gap IH-type accelerating structures with a fixed length of accelerating gaps, operated at 80 MHz and relative velocity of 0.06c and 0.1c. It has considered the issues of selecting the optimal length of accelerating gaps, the drift tube geometry, and the drift tube suspension system, taking into account limits on the magnitude of high-frequency losses in the cavity walls and the axis-field distribution, at which the field value in the extreme accelerating gaps is at least 50% of the field value in the central gaps.
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