Nuclear fusion is the process of combining two atoms into one, releasing a great amount of energy. This process is what powers the sun and stars. Scientists are working to develop nuclear fusion reactors that can harness this energy for use on Earth.
The Basics of Nuclear Fusion
Nuclear fusion occurs when the nuclei of two atoms are combined to form a new, heavier nucleus. This releases a great amount of energy because the mass of the new nucleus is less than the sum of the masses of the two original nuclei. The difference in mass is converted into energy according to Einstein's famous equation, E=mc^2.
The amount of energy released by nuclear fusion is much greater than the amount of energy released by nuclear fission, the process that powers nuclear power plants. This is because nuclear fission involves splitting atoms apart, while nuclear fusion involves combining atoms together.
How Nuclear Fusion Reactors Work
Nuclear fusion reactors work by heating hydrogen gas to extremely high temperatures. This causes the hydrogen atoms to break apart into electrons and protons. The protons are then accelerated and collided together, fusing them into helium atoms. This process releases a great amount of energy in the form of heat and light.
The heat and light from the nuclear fusion reaction can be used to generate electricity. This process is similar to the way that heat and light from the sun are used to generate electricity in solar power plants.
Challenges of Nuclear Fusion
There are a number of challenges that must be overcome in order to develop nuclear fusion reactors that are commercially viable. These challenges include:
* Achieving high enough temperatures to fuse hydrogen atoms
* Confining the plasma long enough for fusion to occur
* Removing the helium ash that is produced by the fusion reaction
* Developing materials that can withstand the extreme conditions inside a fusion reactor
Progress on Nuclear Fusion Reactors
Scientists are making progress in overcoming the challenges of nuclear fusion. In 2018, researchers at the Joint European Torus (JET) in the United Kingdom achieved a record-breaking fusion reaction that produced 59 megajoules of energy. This is equivalent to the amount of energy that could be produced by burning about 14 gallons of gasoline.
While this is a significant achievement, it is still far from the amount of energy that would be needed to power a commercial fusion reactor. However, it is a sign that progress is being made and that nuclear fusion may one day be a viable source of energy for the world.
