There is an improved fusion plasma torch apparatus-engines and method. Deuterium-Tritium or other fusion reaction reagents are injected in a fusion reaction channel where is a current of an arc upon which is imposed modulated current extinguishing whatever transversal plasma arc vibrations thereby eliminating a plasma arc bypassing to a wall and consequently decreasing the heat losses at the expense of dropping down convective and conductive heat exchange and locating the plasma arc column strictly in the center of arc's channel.