How does solar electric propulsion (ion propulsion) work?

How is the ion propulsion in DS1 solar powered?

Solar power does not make DS1 move, directly. Solar power, from solar panels on DS1, makes electricity. Different parts of the thruster have to receive certain voltages of electricity to work properly. Electricity energizes the plasma in the main chamber of the thruster. A flow of electrons, which is electricity, is also necessary to shoot into the plasma to make ions of the atoms in the plasma, as well as to neutralize them once they have left DS1.

The solar panels also provide electricity to other parts of DS1.

How does DS1's engine work?
What happens to the ions once they leave the space craft?
Where does DS1 get its electricity?
How does DS1's electrical system work?

Why is the ion propulsion on DS1 solar powered?
What is plasma?
What role does the Sun play in space missions like DS1's?
What's an electron?