Experimental Study For The Feasibility Of A Crystalline Undulator
  We present an idea for creation of a crystalline undulator and report its first realization. One face of a silicon crystal was given periodic micro-scratches (trenches) by means of a diamond blade. The X-ray tests of the crystal deformation due to given periodic pattern of surface scratches have shown that a sinusoidal shape is observed on both the scratched surface and the opposite (unscratched) face of the crystal, that is, a periodic sinusoidal deformation goes through the bulk of the crystal. This opens up the possibility for experiments with high-energy particles channeled in crystalline undulator, a novel compact source of radiation. 
S. Bellucci, S. Bini, V.M. Biryukov, Yu.A. Chesnokov, S. Dabagov, G.   Giannini, V. Guidi, Yu.M. Ivanov, V.I. Kotov, V.A. Ma...