Bent crystals as a tool to extract the multi-TeV beam at the LHC.
Romagnoni M. per il Gruppo CRYSBEAM
The possibility to steer the 6.5 TeV protons through a bent crystal has been recently demonstrated in a crystal collimation test on LHC. Beam extraction demands a larger deflection angle than collimation, about 1 mrad $vs.$ 0.05 mrad, without decreasing the bending radius. These two requirements impose to manufacture a uniformly bent crystal with unconventional thickness, $i.e.$, of some centimeters. Here, we present the design study, realization and characterization of cm-long bent crystals that can be exploited for the LHC beam extraction for fixed-target experiments. This work has been conducted in the framework of the ERC CRYSBEAM project.