The theory of the scattering-induced feeding-in in bent crystals
Abstract An analytical theory for the efficiency of scattering-induced transitions from a random to a channeled state (feed-in) in bent crystals is derived. The predictions from the theory are in good agreement with experiment and Monte Carlo simulations.
Coherent effects in crystal collimation
We present theory for coherent effects observed in crystal collimation experiments that is in good quantitative agreement with the RHIC and Tevatron data. We show that these effects are caused by a coherent scattering on the field of bent crystal atomic planes, which amplifies beam diffusion in accelerator by orders of magnitude compared to the scattering in amorphous material. This coherent scattering could replace the traditional amorphous scattering in accelerator collimation systems. We predict that for negative particles this effect is as strong as for positive ones, opening a principle way for efficient crystal steering of negative particles at accelerators. Predictions are made for high energy accelerators where crystal collimation is seen as an interesting application.
High energy proton deflection in bent single crystals
Abstract Fermilab experimental data on dechanneling length measurements in a bent crystal are well described by a simple model. The dechanneling length is found to be directly proportional to the potential well depth in a bent crystal. The same model could explain the temperature dependence. Optimum curvature and efficiency limit in this model are found as functions of the deflection angle.