Abstract: The compact fusion reactor is a new concept of magnetic confinement fusion reactor proposed by Lockheed Martin in 2014. Aiming at the unique magnetic structure of the reactor, the confinement dynamics of a single high-energy charged particle was studied by Monte Carlo method. Taking into account the local flatness characteristics of the magnetic field configuration, a charged particle basically moves in a constant magnetic field for a sufficiently small area or a short enough timestep. Therefore, a point-by-point analytical solution to the particle motion equation that can accurately guarantee the conservation of energy is given, which has long-term tracking capabilities. The simulation results show that for high-energy deuterium particles with 1 kiloelectron volt energy randomly distributed in the initial position and velocity direction, there is about a seven-hundredth probability that can be constrained to the order of ten milliseconds. Since the proposed method for solving the motion equation is independent of the magnetic configurations, it can be naturally generalized to an arbitrary magnetic confinement setup.

Key words: Compact Fusion Reactor, Single Charged Particle Motion, Magnetic Trap