Fig. 7

A magnetic field configuration in the left-hand side of the exit of a main magnetic bottle, for reclaiming charged particles to escape from the exit (plane (a)). We first assumed the value of the magnetic field in plane (a) and the magnetic field configuration. After that we set the length and the value of the electric field between planes (c) and (d), based on Eq. (26). With respect to the magnitude 0.5 T of B in plane (a), we assumed the value so that the gyration radius of a D⁺ ion with the mean thermal velocity 2×10⁶ m/s may be nearly 0.1 m