Extraction of a 70-GeV/cProton Beam to the RAMPEX Setup by Using a Silicon Crystal

The experimental data on the formation of a stable proton beam with a 70-GeV/ c momentum extracted from the U-70 accelerator (Protvino) to the 14th channel with a bent silicon crystal (under conditions of operation of several setups) are presented. The beam is intended for the RAMPEX experimental facility with a polarized target. The beam intensity, angular divergence, and spot size on the target should be at least 5 × 10 6 protons per cycle, below 2.5 mrad, and no larger than 10 (horizontal) and 14 (vertical) mm, respectively. The results obtained show that the beam is stable in the single extraction mode, but its dimensions are slightly larger than those required by the experiment. An instability of the beam is observed when the beam is extracted to several experimental setups in parallel. Further investigations are planned in order to optimize the position and parameters of the silicon single crystal.