In most materials the dymanics of motion are determined by forces between neighbor regions of the material. In a plasma, charge separation between ions and electrons gives rise to electric fields, and consequent charged particle flows give rise to currents and magnetic fields. This long-ranged Coulomb force is fundamental and principal subject for studying the enriched fields of plasma. A plasma is a quasineutral gas of charged and neutral particles which exhibits collective behavior. Fusion is a reaction which involves two nuclei of very low A , atomic mass number , combining to form a more stable nucleus.
Fusion is the most important phenomenon in nature.
Fusion of proton in thermal motion is the source of energy of the Sun . So it is ultimately the source of energy for all the natural physical and biological processes on the earth. There have been, and still is, 'a quest for a sun on the earth' , a hope that some day fusion will be usable directly on earth to produce energy in a fusion reactor Tokamak . In the fusion reactor deutrium and tritium are used as fuels. The sun produces a high energy, which is so large that it makes up for the very slow rate of the individual reactions.