Since Fsp is created by the currents that produce the magnetic field for confining plasma, Fsp is a force that attracts the positive particles qa toward the currents. So, we can create in the wires for confinement a positive electric field E that pushes the positive particles qa off the wires, see Figure 6. Because E is contrary to Fsp, the positive ions of the plasma are kept off the wall.
As the circuit for confinement magnetic field is already well insulated, the positive electric field can be created just by putting a high voltage on the whole circuit for confinement after disconnecting the circuit from the ground.
However, the reaction chamber must be insulated from the ground because the positive charge in the wire will create a capacitance with the metallic chamber which will be charged negatively by a current from the ground and annihilate the electric field E inside the chamber.
The voltage should be adjusted such that the force on the electrons from the electric field E balances the force Fsp to avoid the contact of the electron with the wall of the chamber.
This method is explained in the article.
