An ultimate linac structure is realized by an appropriate crystal lattice (superlattice) that serves as a ``soft'' irised waveguide for x rays. High-energy ({~}40 keV) X rays are injected into the crystal at the Bragg angle to cause Bormann anomalous transmission, yielding slow-wave accelerating fields. Particles (e.g., muons) are channeled along the crystal axis.
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Tajima et al. (1987) studied this question.
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