The undulator linear accelerators (UNDULAC) were suggested as a new type of high intensity low energy ion linac. Such accelerators can be realized in a periodical IH structure. All spatial harmonics of RF field in UNDULAC are non-synchronous with a beam. In our case an accelerating force is to be driven by a combination of the zero and the first space harmonics. The ratio of the first to the zero RF field harmonics amplitudes must be equal to 0.25 - 0.3. The effective beam bunching and focusing can be provided in this case. The geometry of UNDULAC accelerating channel is discussed to realize this ratio. The first results of the IH resonator type choice are also presented.
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