Ameer Randolph
Nuclear fusion has the potential to provide a limitless source of clean energy for the world. It is a process that occurs naturally in the sun and other stars but is difficult to replicate on Earth. Fusion joins two light elements to form a heavier element, releasing an enormous amount of energy. The most promising fuels for producing energy in future fusion power plants are deuterium and tritium, which are isotopes of hydrogen, the most abundant element in the universe. While deuterium is common, tritium is rare in nature and not immediately available for use in potential power plants. Scientists are actively researching how to produce tritium through processes like breeding, which involves exposing lithium to energetic neutrons. The fusion energy released from just 1 gram of deuterium-tritium fuel equals the energy from about 2,400 gallons of oil. However, there are concerns about the limited supply of tritium and the challenges of tritium breeding, which may impact the feasibility of fusion power.
| Characteristics | Values |
|---|---|
| Fusion fuel sources | Hydrogen, Lithium |
| Hydrogen isotope used as fuel | Deuterium |
| Other isotopes used as fuel | Tritium, Helium-3 |
| Amount of deuterium in seawater | 1 out of 6,500 hydrogen atoms |
| Amount of deuterium in the ocean | 1 out of 5,000 hydrogen atoms |
| Energy from 1 gram of deuterium-tritium fuel | Energy from 2,400 gallons of oil |
| Energy from 1 gram of fusion fuel | Energy from 8 tons of oil |
| Energy from the ocean's deuterium | 1.4x10^31 Joules |
| Lithium reserves | 26 million tons |
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What You'll Learn
Fusion fuel sources: hydrogen and lithium
Hydrogen and lithium are both considered viable fuel sources for fusion power. Fusion power is a promising source of energy for the future, as it has the potential to supply safe, clean, and relatively limitless energy. However, there are challenges to be addressed before fusion power plants can become a reality, such as identifying a sustainable fuel source.
Hydrogen is the most abundant element in the universe, and it has two isotopes that are of particular interest for fusion fuel: deuterium and tritium. Deuterium is abundant on Earth, found in semi-heavy water, and about 1 out of every 5,000-6,500 hydrogen atoms in seawater is deuterium. This means that the oceans contain many tons of this isotope. Deuterium is also a naturally occurring isotope of hydrogen and is commonly available. On the other hand, tritium is a rare, radioactive isotope of hydrogen that is challenging and costly to obtain. It has a short half-life of 12 years and is not immediately available for use in potential power plants. Tritium exists on Earth due to natural production from interactions with cosmic rays, but the quantities are insufficient for energy production.
To address the challenge of tritium availability, scientists are researching methods to produce it through a process called breeding. One way to breed tritium is by bombarding lithium with neutrons through a low-energy nuclear fission reaction. Lithium is an element created in the primordial universe, and it exists in two stable isotopes: lithium-7 and lithium-6. Lithium-6 is crucial for nuclear fusion reactors, but it is much less abundant than lithium-7, and isolating it is challenging. Researchers have traditionally used a highly toxic process involving mercury to isolate lithium-6, but they are now seeking more environmentally friendly methods.
While hydrogen and lithium show promise as fuel sources for fusion power, there are still technical challenges to be overcome. For example, fusion reactions require fuel in a plasma state, specific temperatures, and sufficient pressure and confinement time. These conditions have proven difficult to achieve and sustain. Additionally, there are concerns about the environmental impact of hydrogen production, as it is often produced using electricity generated by coal-fired power plants or nuclear fission. Nevertheless, with further research and development, hydrogen and lithium may play a significant role in providing clean and abundant energy for future generations.
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Deuterium-tritium fusion
Deuterium and tritium are isotopes of hydrogen, the most abundant element in the universe. Deuterium-tritium (DT) fusion is a process that occurs naturally in the Sun and other stars, and it has the potential to supply safe, clean, and relatively limitless energy on Earth. DT fusion occurs when deuterium and tritium fuse to create a helium atom with two protons and two neutrons, and an energetic neutron. These energetic neutrons could be used to generate energy in future fusion power plants.
DT fusion has several advantages over other types of fusion. It has a relatively low minimum temperature of 108 Kelvin, and it releases more energy than other fusion reactions. For example, the energy released from just 1 gram of DT fuel is equivalent to the energy from about 2,400 gallons of oil. This makes DT fuel an attractive option for future commercially feasible fusion plants. However, one challenge is that DT fusion requires a large startup tritium supply, as the right conditions for fusion only occur in the hottest part of the plasma of ionized gases.
Tritium is a radioactive isotope with a 12-year half-life that is rare in nature. It can be produced by exposing lithium to energetic neutrons through a low-energy nuclear fission reaction. This process, known as tritium breeding, has been proposed for use in fusion power plants to generate tritium at the rate needed for self-sufficiency. However, there are concerns about the feasibility of tritium breeding, as it has never been tested in a fusion reactor. Some believe that a power-producing reactor may only be able to produce slightly more tritium than it needs to fuel itself, and any tritium leakages or prolonged maintenance shutdowns will further reduce this margin.
Despite these challenges, DT fusion technology has advanced significantly since the first DT fusion experiment in 1938 by University of Michigan physicist A. J. Ruhlig. Recent experiments, such as the Canadian-fueled experiment at JET, have demonstrated that fusion research is approaching an important threshold of producing more energy than is put into the reactions. The ITER reactor under construction in France is expected to burn deuterium and tritium and will be twice the size of JET, providing further reassurance that fusion power is achievable. DT fusion has the potential to revolutionize energy production by providing a limitless, clean source of energy that does not produce long-life radioactive waste.
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Breeding tritium
Tritium is a rare and difficult-to-obtain resource, and its scarcity poses a challenge to the development of fusion power. It is not a naturally occurring resource on Earth, but it can be produced through nuclear fission reactions or by exposing lithium to energetic neutrons.
Tritium breeding is a process that aims to create tritium through nuclear reactions, specifically by exposing lithium to neutrons. This process is essential for the development of fusion power plants as it offers a potential solution to the limited supply of tritium. The concept of tritium breeding revolves around the use of breeding blankets, which are devices employed in nuclear engineering to facilitate the transmutation of elements using neutron flux. In the context of tritium breeding, these blankets contain lithium, and when they absorb neutrons, they produce tritium and helium through nuclear reactions. This tritium can then be extracted and utilised as fuel in fusion reactions.
The International Thermonuclear Experimental Reactor (ITER) project, a collaborative effort among 35 countries, is at the forefront of exploring tritium breeding. ITER aims to test the feasibility of tritium self-sustainment in fusion power plants through its Test Blanket Module (TBM) program. This involves testing various tritium breeding blanket designs in a real fusion environment to assess their efficiency in breeding and extracting tritium.
However, there are challenges associated with tritium breeding. One significant obstacle is achieving a positive breeding ratio, where more tritium is produced than consumed in the reactor. This requires high neutron absorption by lithium and minimal loss of tritium, which is technically demanding. Additionally, the engineering complexities of integrating breeding blankets with operating tokamaks, the doughnut-shaped reactor vessels used in fusion reactions, present further hurdles.
Despite these challenges, successful tritium breeding is crucial for the commercialisation of fusion power. Without a self-sustained tritium source, the viability of fusion power may be jeopardised. Researchers are actively working to overcome these obstacles, recognising the potential of tritium breeding to revolutionise energy production and provide a safe, clean, and virtually limitless energy source for humanity.
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Fusion fuel challenges
Fusion fuel, which powers the Sun and other stars through nuclear fusion reactions, has the potential to supply safe, clean, and relatively limitless energy on Earth. The most promising fusion fuel is a combination of hydrogen gases—deuterium and tritium—which are isotopes of hydrogen, the most abundant element in the universe.
However, there are several challenges associated with fusion fuel and its implementation:
Availability and Production of Tritium
Tritium is rare in nature and not immediately available for use in power plants. While it can be produced by exposing lithium to energetic neutrons through a low-energy nuclear fission reaction, this process, known as tritium breeding, has never been tested in a fusion reactor. There are concerns that a power-producing reactor may only be able to produce slightly more tritium than it needs to fuel itself, and issues like tritium leakages or prolonged maintenance shutdowns could further impact this narrow margin.
High Startup Tritium Requirements
Fusion reactors generally require a large startup supply of tritium because the right conditions for fusion only occur in the hottest part of the plasma of ionized gases. This means that most of the injected tritium remains unused and diffuses out, requiring frequent replenishment.
Technical and Engineering Challenges
Fusion fuel must be heated to extremely high temperatures (over 100 million degrees Celsius) and kept stable under intense pressure and confinement for long enough to allow the nuclei to fuse. Achieving these conditions is challenging, and as a result, fusion reactors need to be larger and more costly than fission reactors of the same power output.
Radioactive Waste and Radiation Damage
Fusion reactions that utilize deuterium and tritium share many of the drawbacks of fission reactors, including the production of large quantities of radioactive waste and serious radiation damage to reactor components. While fusion waste has a shorter half-life and does not require long-term storage, the choice of materials for fusion reactors must consider their activation and resistance to irradiation.
Economic Competitiveness
The widespread adoption of non-nuclear renewable energy sources has transformed the energy landscape, and it is projected that renewables will supply 74% of global energy by 2050. Fusion plants are expected to face high startup and capital costs, and economists suggest that fusion power may struggle to match the costs of other renewable energy sources.
Despite these challenges, research and development in fusion fuel and technology continue to progress, with the goal of harnessing the potential of fusion energy as a safe, clean, and abundant energy source for the future.
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Fusion fuel yield
The high yield of fusion fuel is due to the energy released when atomic nuclei fuse. This energy is associated with the small changes in mass that occur during the fusion reaction. Even a small quantity of fusion fuel can result in a significant amount of energy because of the large energy stores in the fuel. For example, the energy released by fusing 1 ton of deuterium, a naturally occurring isotope of hydrogen, is equivalent to burning over 10 million tons of coal. Similarly, if the deuterons in a 12-ounce glass of water could be fused, the energy yield would be equivalent to 30 gallons of gasoline or 360 pounds of coal.
Deuterium is a promising fuel for fusion reactions because it is readily available and can be distilled from all forms of water. About 1 out of every 5000 to 6500 hydrogen atoms in seawater is deuterium, which means that the oceans contain many tons of this isotope. Deuterium is also routinely produced for scientific and industrial applications. When paired with tritium, another isotope of hydrogen, the deuterium-tritium (D-T) reaction has been identified as the most efficient for fusion devices. This fuel combination has a higher energy yield compared to other fusion reactions and can achieve nuclear fusion reaction conditions at lower temperatures.
However, there are challenges associated with the yield of fusion fuel. Tritium, for example, has a short half-life of 12 to 12.6 years and is rare in nature, making it difficult to obtain and store. While tritium can be bred from lithium, the process has never been tested in a fusion reactor, and there are concerns about its feasibility. Additionally, fusion reactors require a large startup tritium supply, and the effective burn rate in the plasma chamber is typically low, around 1%. This means that most of the injected tritium remains unburned and needs to be recycled.
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Frequently asked questions
Fusion fuel is created by forcing together two particles that, by nature, repel. This process creates helium and neutrons, which are lighter in mass than the parts they were originally made of. The missing mass converts to an enormous amount of energy.
Fusion fuel sources, hydrogen and lithium, are widely available in many parts of the Earth. Deuterium, an isotope of hydrogen, is found in seawater at a ratio of about 1 out of every 6,500 hydrogen atoms. This means that the oceans contain many tons of this isotope.
Fusion fuel has the potential to provide a limitless source of clean energy, unlike fossil fuels, which are finite and harmful to the environment.
