Partial-Ionization Deconfinement Effect in Magnetized Plasma

Abstract

In partially ionized plasma, where ions can be in different ionization states, each charge state can be described as a different fluid for the purpose of multi-ion collisional transport. In the case of two charge states, transport pushes plasma toward equilibrium which is found to be a combination of local charge state equilibrium and generalized pinch relations between ion fluids representing different charge states. Combined, these conditions lead to a dramatic deconfinement of ions. This deconfinement happens on the timescale similar but not identical to the multi-ion cross-field transport timescale, as opposed to electron-ion transport timescale in fully ionized plasma. Deconfinement occurs because local charge state equilibration enforces the disparity in diamagnetic drift velocities of ion fluid components, which in turn leads to the cross-field transport due to ion-ion friction.

Submitted to Physics of Plasmas. 7 pages, 2 figures. Revised version

References in corpus (4)

• Theoretical description of heavy impurity transport and its application to the modelling of tungsten in JET and ASDEX Upgrade
• Opportunities for plasma separation techniques in rare earth elements recycling
• Harnessing mass differential confinement effects in magnetized rotating plasmas to address new separation needs
• Heat Pump via Charge Incompressibility in a Collisional Magnetized Multi-Ion Plasma