Abstract
The Magnetic sail (MagSail) is a space propulsion system utilizing an interaction between the solar wind particles and the artificial magnetic field generated by the coil on the spacecraft. The thrust is proportional to the magnetospheric size. In order to improve an efficiency of capturing the solar wind, a multi-coil magnetic sail, using several coils, is proposed. In this research, to evaluate the magnetospheric size of multi-coil magnetic sail, multi-coil magnetic sail consisted of three-small coils was developed and the magnetic field strength was characterized by the magnetic field probes. As a result, a 330 mm-magnetosphere was found in the normalized magnetic field distribution. In space, the ion Larmor radius at the magnetospheric boundary rLi is about 72 km at 1 AU from the sun, and a magnetospheric size in space Lspace = 1.6 km is obtained by substitution rLi = 72 km for the non-dimensional parameter rLi/L = 4.5, then, MagSail produce 82 mN thrust.
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