Plasma Diffusion Associated with Drift-Wave Instabilities Due to Local Production of Massive Negative Ions

When fullerene negative ions are locally produced in a magnetized plasma consisting of electrons and potassium positive ions, a negative-ion-driven drift wave (NDDW) is destabilized by the density gradient and strong radially outward diffusion of negative ions is observed nearby the local production region. The correlation between the diffusion coefficient and the NDDW amplitude gives support to an interpretation that NDDW is responsible for the enhanced diffusion.