Studying the proton beam intense extraction with a bent crystal during simultaneous operation with internal targets at the IHEP U-70 accelerator

The mode of simultaneous proton extraction with a silicon bent crystal and internal targets provides for the proton beam extraction within the range of 1.0 x 1010 up to 6.0 x 1011 protons/cycle with the efficiency of approximately 45%. Two physical performances with common duration of above 1200 h are carried out in such a mode. Up to 1.0 x 1020 protons/cm2 were dropped on the crystals during these performances. No worsening of the silicon channeling properties identified thereby. The beam characteristics (its intensity, duration and quality) are satisfactory. Further works on improving this mode are carried out