Extraction of a 70-GeV/c proton beam to the RAMPEX setup by using a silicon crystal

The experimental data on the formation of a stable proton beam with a 70-Ge V/c momentum extracted from the U-70 accelerator (Protvino) to the 14th cha nnel with a bent silicon crystal (under conditions of operation of several setups) are presented. The beam is intended for the RAMPEX experimental fac ility with a polarized target. The beam intensity, angular divergence, and spot size on the target should be at least 5 x 10(6) protons per cycle, bel ow 2.5 mrad, and no larger than 10 (horizontal) and 14 (vertical) mm, respe ctively. The results obtained show that the beam is stable in the single ex traction mode, but its dimensions are slightly larger than those required b y the experiment. An instability of the beam is observed when the beam is e xtracted to several experimental setups in parallel. Further investigations art: planned in order to optimize the position and parameters of the silic on single crystal.