Аннотация:The primary challenge of fusion is to confine a gas comprised of ionized hydrogen isotopes, called a plasma, while it is heated and its pressure increases to initiate and sustain fusion reactions. There are three known ways to confine the plasma. Gravitational confinement, the method used by the sun, confines the plasma through large gravitational forces. Second, inertial confinement compresses the hydrogen gases through a controlled implosion, with inertia then holding the gases together long enough for fusion reactions to occur. Finally, magnetic confinement uses magnetic fields acting on hydrogen atoms that have been ionized (given a charge) so that the magnetic fields can exert a force on the moving particles.