Nuclear Fusion D-T Fusion Reactions. Nuclear fusion Nuclear fusion occurs when two light nuclei merge to form a heavier nucleus. The binding energy curve.

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Presentation transcript:

Nuclear Fusion D-T Fusion Reactions

Nuclear fusion Nuclear fusion occurs when two light nuclei merge to form a heavier nucleus. The binding energy curve shows that if these lighter nuclei fuse together, then the binding energy of each nucleon in the new nucleus formed is greater than before and the nucleons are more tightly bound together. So, an equal amount of energy to the increase in binding energy is released. Deuterium nucleus Helium nucleus

Nuclear fusion Work out the energy released by the following fusion reaction and compare it with the energy released by a nuclear fission reaction. Nuclear mass finder 2 x = u Mass of H Mass of He Mass of Beta particle x 931 MeV = 0.4 MeV

Nuclear fusion To achieve nuclear fusion the light nuclei must collide with a very high KE. Nuclear fusion is the reaction happening in the Sun and other stars and the temperature in the Sun’s core is estimated to be 10 8 K.

D-T reactors These incredible temperatures of 10 8 K represent a barrier for controlled fusion in a reactor that has not yet been broken. The D-T (deuterium – tritium) reactor seems to be the most likely way to achieve controlled nuclear fusion. The nuclear fusion is between one deuterium and one tritium nucleus:

D-T reactors Deuterium is found in water. In fact, it corresponds to the 0.01% of natural hydrogen. Tritium is not present naturally, so it must be produced within the reactor. This is achieved by allowing the neutrons from the fusion reaction to bombard nuclei of Lithium. This lithium surrounds the core (where the reaction takes place) of the reactor in a sort of blanket.