Abstract
Transmission of 1-MeV protons through a conical borosilicate macrocapillary was simulated. In present simulations we included atomic scatterings and patch deflections, different from pioneer work where only the former was considered. The simulated results provide deep insight into the transmission mechanisms of MeV ions through a conical macrocapillary: for tilt angles smaller than the taper angle, the enhanced transmission is fully governed by atomic scatterings, whereas beyond the taper angle the patch deflections are of some importance. Moreover, the strength of patch deflections was found to first increase to a maximum and then drop to zero as the tilt angle increases. This is different from those of the atomic scatterings and geometric laws, which both monotonously decrease with the tilt angle. The core and halo structure in the transmission profile unique to the MeV ions through the conical capillary can be formed only for smaller beam divergence.
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Schedule a callMore From: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms
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