Dependence of the probability of close collisions of high-energy charged particles in a bent crystal on the orientation of the crystal

The probability of close collisions (PCC) of high-energy protons in a bent crystal was estimated for different orientations of the crystal with respect to the direction of motion of the particles. This allowed to carry out the comparison of the PCC for three main mechanisms of beam deflection by a bent crystal: planar channeling, volume reflection and stochastic deflection. The comparison showed that for positively charged particles the lowest PCC corresponds to stochastic deflection and the highest PCC corresponds to volume reflection.