Electrodeless Plasma Acceleration Using $m=$ 0 Coil

We have been investigating electrodeless plasma acceleration method by the Lorentz force, using $m=$ 0 coil ($m$ is an azimuthal mode number) without electrode erosion condition, which leads to a deep space exploration in future [1,2]. The Lorentz force of $j$-theta * $B$r is composed of two factors; the $m=$ 0 coil can generate the azimuthal current $j$-theta by supplying an AC current (over 100 A) and the externally magnet make the static radial magnetic field $B$r in divergent field configuration. In the past $m=$ 0 coil experiment using the SHD [3], we have found increases of ion velocity and electron density by a factor of 2.5 and 3, respectively. In this research, detailed measurement have been done as to ion velocity, electric density and the azimuthal current to clarify the effect of $m=$ 0 coil method on plasma acceleration. [1] S. Shinohara \textit{et al.}, IEEE Trans. Plasma Sci. \textbf{42} (2014) 1245. [2] T. Ishii \textit{et al.}, JPS Conf. Proc. \textbf{1} (2014) 015047. [3] D. Kuwahara \textit{et al}., Rev. Sci. Instrum. \textbf{84} (2013) 103502.