A system for the controlled fusion reaction of materials comprising: a. a first housing comprising an inner surface and an outer surface, the inner surface defining a cavity; b. an inner housing located within the cavity, the inner housing comprising an inner surface, the inner surface defining a non-mechanical rotation chamber (103,222); c. a first material having a first reactant for forming a weakly ionized plasma within the rotation chamber (103,222); d. a second material having a second reactant; e. an ionizer operably associated with the first material, whereby the ionizer is capable of ionizing a component of the first material and thereby creating the weakly ionized plasma; f. a rotation inducing assembly operably associated with the ionizer, the first housing, and the non-mechanical rotation chamber, whereby the rotation inducing assembly is capable of causing the weakly ionized plasma consisting mainly of neutrals to rotate at a high speed in the non-mechanical rotation chamber in which the rotation of ions is due to the Lorentz force and the rotation of neutrals is due to ion-neutral collisions, thereby inducing a fusion reaction between the first reactant and the second reactant during the high speed rotation of the weakly ionized plasma; and g. a direct energy conversion assembly configured to extract energy from charged particles produced in the fusion reaction and convert the energy to electrical current characterised in that the direct energy conversion assembly comprises an array of semiconductor PN junctions positioned adjacent to the rotation chamber (103,222) such that charged particles produced in the fusion reaction impinge upon the PN junctions, creating electron-hole pairs, and thereby inducing an electrical current. a. a first housing comprising an inner surface and an outer surface, the inner surface defining a cavity; b. an inner housing located within the cavity, the inner housing comprising an inner surface, the inner surface defining a non-mechanical rotation chamber (103,222); c. a first material having a first reactant for forming a weakly ionized plasma within the rotation chamber (103,222); d. a second material having a second reactant; e. an ionizer operably associated with the first material, whereby the ionizer is capable of ionizing a component of the first material and thereby creating the weakly ionized plasma; f. a rotation inducing assembly operably associated with the ionizer, the first housing, and the non-mechanical rotation chamber, whereby the rotation inducing assembly is capable of causing the weakly ionized plasma consisting mainly of neutrals to rotate at a high speed in the non-mechanical rotation chamber in which the rotation of ions is due to the Lorentz force and the rotation of neutrals is due to ion-neutral collisions, thereby inducing a fusion reaction between the first reactant and the second reactant during the high speed rotation of the weakly ionized plasma; and g. a direct energy conversion assembly configured to extract energy from charged particles produced in the fusion reaction and convert the energy to electrical current characterised in that the direct energy conversion assembly comprises an array of semiconductor PN junctions positioned adjacent to the rotation chamber (103,222) such that charged particles produced in the fusion reaction impinge upon the PN junctions, creating electron-hole pairs, and thereby inducing an electrical current.