The energy deposition, production of displacement and replacement collisions induced by fusion α-particles with energies from 10keV to 50keV are studied by computer code MARLOWE based upon binary-collision approximation. The results are compared with the Monte-Carlo simulation. The number of vacancies is found to be proportional to the elastic energy, deposition, in agreement with analytical theory. The similar profiles are observed for both elastic energy deposition and vacancies. The radiation damages caused by α-particles in different target elements are discussed as well.

A Monte Carlo code is described which simulates the displacement process and the transmissions of energetic particles in solids by ion bombardment, including the operating principle, the physics model and the computing examples. Based on the binary collision approximation, the depth distributions of displasced atoms in amorphous targets induced by α particles are investigated, and the relations between the depth distributions of displaced atoms and energy deposition in solids are discussed.

In this paper, some interatomic potentials in studies of the interaction of energetic particles with solid targets are presented, the methods and results of approximate calculations of scattering angle for binary collision in crystalline and amorphous solids are given. The obtained conclusions is significative for computing axial blocking dips, surface peak intensity as well as sputtering by using Monte Carlo simulation.

A Monte-Carlo Neutron Transport Program and Neutron Radiation Damage Program are presented for studying radiation damage in the First Wall. The programs are used to static multi-component amorphous target. With the average wall load 1MW/m², the following calculating results for EHR first wall (type 316 stainlees steel)have been performed using designed neutron spectrums at EHR first wall: the PKA energy spectrums (30eV to 1MeV), average displacement per atom rate (20.6dpa/a), average helium and hydrogen production rates (247.18appm/a and 721.15appm/a). It is shows that Hybrid Reactor's radiation damage more serious than pure Fusion Reactor's by comparison of above results and EHP's calculated results in the same wall load. The cross-section data from MC (87) n library is used in this calculation.

A Monte Carlo computer program simulating the sputtering of two-component multi-layer dynamic target is presented, including principle, physical models, program design and applicability. The atomic scattering is governed by the Moliere approximation to the Thomas-Fermi potential and is evaluated with the binary-collision approximation. The target is treated in slab geometry, and the thickencss and the target composition of each slab can be rearranged during sputtering.This program can be used to calculate sputtering yields of two-component amorphous target and, therefore, to study preferential sputtering, energy and angular distributions of sputtered species as well as the depth of origin of the sputtered particles in solid target. Some calculation results are given in this paper.