First results of investigation of radiation from positrons in a crystalline undulator

Channeling and Radiation in Periodically Bent Crystals

“…In particular, in publications by Bellucci et al [5,44,45,55,57], where the description of the first experimental attempt to measure the CUR was give, the parameters chosen for a Si-based CU were very close to those indicated above. In particular, in publications by Bellucci et al [5,44,45,55,57], where the description of the first experimental attempt to measure the CUR was give, the parameters chosen for a Si-based CU were very close to those indicated above.…”

“…4.2 and 4.5 and Chap. These include making regularly spaced grooves on the crystal surface either by a diamond blade [44,55,117] or by means of laser-ablation [43], deposition of periodic Si 3 N 4 layers onto the surface of a Si crystal [117,118]. A current status and achievements of this method in producing CUs with large bending amplitudes, a d, as well as the theoretical background are described in Sect.…”

“…The manufactured crystals were further used in the IHEP experiments on CUR the preliminary results of which were published in [5,44,45] …”

Radiation of relativistic particles for quasiperiodic motion in a transparent medium

“…Figs.1 and 2 illustrate the influence of media on the radiation in the crystal undulator [13,14,15]. In the silicon single crystal at photon energies larger than 10 KeV the dielectric function is smaller than 1.…”

“…Preliminary results of the experiment [15] give an indication on the observation of undulator radiation. Calculations of the expected intensity for this experiment were based on the theory [16] of radiation for quasiperiodic motion in vacuum.…”