Application of novel material in crystal accelerator concepts

Materials which incorporate regular macroscopic features superposed on the underlying crystal lattice are of potential interest in connection with application to crystal accelerators and coherent radiation sources. The authors have begun an investigation of one such material, porous Si, in which pores of radii up to a few tens of lattice spacings are etched through finite volumes of a single crystal. The potential reduction of losses to particles hyperchanneled along the pores makes this a very interesting material in crystal accelerators for relativistic, positively charged particles. Results on material properties which are important in this context are presented. The consequences for particle transport are discussed. >