Effect of grid bias upon negative ion density in a magnetized plasma
Abstract
A hydrogen plasma magnetized by a pair of Helmholtz coils was separated into two regions by inserting a metallic grid. The region with discharge filaments was separated from a low-density-plasma region without filaments by the grid. The effect of the mesh grid potential and that due to the linear magnetic field upon the hydrogen negative ion (H−) density in the low-density-plasma region were investigated with the direct current laser photodetachment method. The electron temperature at the center of the low-density-plasma decreased from 1.5 to 0.5 eV while the electron density increased from 2×1010 to 6×1010 cm−3 by reducing the grid bias from +20 to −60V. The ratio of the H− density to the electron density increased from 9 to 13 % by applying the linear magnetic field to the hydrogen plasma.
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