What about the oscillation level? Is it in the thermal noise level, or sufficiently significant level?

Well Landau-Lifshiz Textbook Vol 8 has a chapter on magnetohydrodynamics, They discuss a toroidal plasma problem, I think... read the chapter, obtain all the equations there, find a good fellow programmer and then work very hard on any question regarding plasma confinement... the chapter is a beautiful masterpiece joining magnetism and hydrodynamics.

As response to Karmakar, he ions temperature is very low (less than 100eV), the idea is accelerate the plasma over 150keV using magnetic fields through a thin torus. The oscillation is provoked due ions (blue color) approaches to the coil (black) then is repelled again the opposite wall of the chamber and goes again the outer surface of the chamber but the amplitude is increased.

I tried designing the coil inner part more far of the plasma but not worked.

Also tried place more coils to give less space coil to coil, things get better but not enought:

What about losses? If the torus small radius is too thin, then the ion larmor radius may exceed it, and ions are not confined.

So that I can not heat the plasma over 100 eV, but I can accelerate it a lot.

Thank you for the advise, I will take care about to increase the magnetic field at lower coil currents

Another problem I have uis that the coupling inductance coil-plasma is very high in this "tokamak like" plasma containes, so I expect the coils inducatnce will drop towards zero so I expect to have very high currents

- I will look for the Landau-Lifshiz Textbook Vol 8 text book