SCIENCE: CAN FUSION MAKE THE WORLD GO ROUND?

Published January 29, 2023
The target chamber at the National Ignition Facility has been the site of a number of breakthroughs in fusion physics | Lawrence Livermore National Laboratory
The target chamber at the National Ignition Facility has been the site of a number of breakthroughs in fusion physics | Lawrence Livermore National Laboratory

Fusion is a nuclear reaction that combines two atoms to create one or more new atoms with slightly less total mass. The difference in mass is released as energy, as described by Einstein’s famous equation, E = mc2, where energy equals mass times the speed of light squared. Since the speed of light is enormous, converting just a tiny amount of mass into energy — like what happens in fusion — produces a similarly enormous amount of energy.

Researchers at the United States Government’s National Ignition Facility in California have demonstrated, for the first time, what is known as “fusion ignition.” Ignition is when a fusion reaction produces more energy than is being put into the reaction from an outside source and becomes self-sustaining.

The technique used at the National Ignition Facility involved shooting 192 lasers at a 0.04 inch (1 mm) pellet of fuel made of deuterium and tritium — two versions of the element hydrogen with extra neutrons — placed in a gold cannister.

When the lasers hit the cannister, they produce X-rays that heat and compress the fuel pellet to about 20 times the density of lead and to more than 5 million degrees Fahrenheit (3 million Celsius) — about 100 times hotter than the surface of the Sun. If you can maintain these conditions for a long enough time, the fuel will fuse and release energy.

The fuel and cannister get vapourised within a few billionths of a second during the experiment. Researchers then hope their equipment survived the heat and accurately measured the energy released by the fusion reaction.

Recently, an American lab demonstrated that fusion could ostensibly be harnessed as a source of power in the future. But there is still a long way to go before it can be viable...

So what did they accomplish?

To assess the success of a fusion experiment, physicists look at the ratio between the energy released from the process of fusion and the amount of energy within the lasers. This ratio is called gain.

Anything above a gain of one means that the fusion process released more energy than the lasers delivered.

On 5th December, 2022, the National Ignition Facility shot a pellet of fuel with 2 million joules of laser energy — about the amount of power it takes to run a hair dryer for 15 minutes — all contained within a few billionths of a second. This triggered a fusion reaction that released 3 million joules. That is a gain of about 1.5, smashing the previous record of a gain of 0.7 achieved by the facility in August in 2021.

How big a deal is this result?

Fusion energy has been the “holy grail” of energy production for nearly half a century. While a gain of 1.5 is, I believe, a truly historic scientific breakthrough, there is still a long way to go before fusion is a viable energy source.

While the laser energy of 2 million joules was less than the fusion yield of 3 million joules, it took the facility nearly 300 million joules to produce the lasers used in this experiment. This result has shown that fusion ignition is possible, but it will take a lot of work to improve the efficiency to the point where fusion can provide a net positive energy return when taking into consideration the entire end-to-end system, not just a single interaction between the lasers and the fuel.

The fuel is held in a tiny cannister designed to keep the reaction as free from contaminants as possible | Lawrence Livermore National Laboratory
The fuel is held in a tiny cannister designed to keep the reaction as free from contaminants as possible | Lawrence Livermore National Laboratory

What needs to be improved?

There are a number of pieces of the fusion puzzle that scientists have been steadily improving for decades to produce this result, and further work can make this process more efficient.

First, lasers were only invented in 1960. When the U.S. government completed construction of the National Ignition Facility in 2009, it was the most powerful laser facility in the world, able to deliver 1 million joules of energy to a target.

The 2 million joules it produces today is 50 times more energetic than the next most powerful laser on Earth. More powerful lasers and less energy-intensive ways to produce those powerful lasers could greatly improve the overall efficiency of the system.

Fusion conditions are very challenging to sustain, and any small imperfection in the capsule or fuel  can increase the energy requirement and decrease efficiency. Scientists have made a lot of progress to more efficiently transfer energy from the laser to the cannister and the X-ray radiation from the cannister to the fuel capsule, but currently only about 10 percent to 30 percent of the total laser energy is transferred to the cannister and to the fuel.

Finally, while one part of the fuel, deuterium, is naturally abundant in sea water, tritium is much rarer. Fusion itself actually produces tritium, so researchers are hoping to develop ways of harvesting this tritium directly. In the meantime, there are other methods available to produce the needed fuel.

These and other scientific, technological and engineering hurdles will need to be overcome before fusion will produce electricity for your home. Work will also need to be done to bring the cost of a fusion power plant well down from the $3.5 billion of the National Ignition Facility. These steps will require significant investment from both the federal government and private industry.

It’s worth noting that there is a global race around fusion, with many other labs around the world pursuing different techniques. But with the new result from the National Ignition Facility, the world has, for the first time, seen evidence that the dream of fusion is achievable. 

The writer is an Associate Professor of Nuclear Engineering at the University of Michigan in the US

Republished from The Conversation

Published in Dawn, EOS, January 29th, 2023

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