The Future of Fusion Energy
Article
The Future of Fusion Energy is a recurring book in the Astral Codex Ten archive, appearing 4 times across 4 issues between June 17, 2022 and September 02, 2022. The archive places it in contexts such as “The Future of Fusion Energy is the best introduction to fusion that I know”; “If you want to learn more about fusion, I highly recommend The Future of Fusion Energy”; “Sam Altman writes in to say he enjoyed the recent book review of The Future Of Fusion Energy”. It most often appears alongside Consciousness and the Brain, God Emperor of Dune, Helion.
Metadata
- Category: Books
- Mention count: 4
- Issue count: 4
- First seen: June 17, 2022
- Last seen: September 02, 2022
Appears In
- Your Book Review: The Future Of Fusion Energy
- Open Thread 232
- Open Thread 239
- Book Review Contest 2022 Winners
Related Pages
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- Consciousness and the Brain (2 shared issues)
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- God Emperor of Dune (2 shared issues)
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- Helion (2 shared issues)
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- Jimmy Carter (2 shared issues)
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- Kora In Hell (2 shared issues)
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- Making Nature (2 shared issues)
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- Sam Altman (2 shared issues)
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- The Anti-Politics Machine (2 shared issues)
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- The Castrato (2 shared issues)
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- The Dawn Of Everything (2 shared issues)
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- The Internationalists (2 shared issues)
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- The Outlier (2 shared issues)
External Links
Source Context
Recovered passages from the original issue text. When the raw archive preserved outbound links inside the source passage, they are listed directly under the quote.
The Future of Fusion Energy is the best introduction to fusion that I know. I can confirm that the information it contains is common knowledge among plasma physicists. My parents, who are not physicists [2], can confirm that it is accessible and interesting to read.
Things are changing fast in fusion right now, and The Future of Fusion Energy is already out of date in some important ways. I will summarize our quest for fusion as it is portrayed in the book, describe what has happened in the field since 2018, and make some predictions about where we go from here. The predictions are my own and do not reflect the opinions of Parisi or Ball.
Figure 9: There are three people in this diagram. Can you find them? ITER is designed to get Q=10. Despite getting 10 times as much energy from fusion as we put into the plasma, ITER is not designed to get engineering breakeven. ITER is designed as an experiment, not as a power plant. There will be tons of measuring devices pointed inwards. There are four different ways to heat the plasma and drive the current. This all allows you to learn more, but it requires extra power and lowers the overall plant efficiency. ITER will be followed by a demonstration power plant, named DEMO [15]. A fully optimized power plant should be able to reach engineering breakeven as long as Q>5. This is why I chose Q=5 as my criterion for ‘getting fusion’. ITER is also testing multiple designs for the tritium breeding blanket. Tritium is expensive and radioactive, so you want to produce it on site. The D-T fusion reaction produces a neutron, which we want to absorb, so we can use it to produce tritium. ‘Breeding' is when we use a neutron to produce a more useful isotope. It is a ‘blanket' because it surrounds the entire plasma, keeping the neutrons from going anywhere else. The best reaction to produce tritium involves lithium-6: 36Li +01n 24He +13T . This reaction also releases energy, which increases the power produced by about 25%. The tritium breeding blanket needs to make this reaction occur as much as possible, to efficiently carry the heat away so it can be used to generate electricity, and to provide a way to extract the tritium produced. ITER is scheduled to begin their first experiments in 2025. Part of why I think that we are about to make rapid progress again is because we are finally getting a large experiment. There have been problems with ITER staying on schedule and under budget. This isn't surprising for a collaboration between governments representing over half the world's population. In 2014, ITER got a new director, recalculated its expected cost, and underwent a major restructuring. Since then, ITER has largely stuck to this schedule and budget. Recently, there has been a 6 month delay because the French nuclear agency did what nuclear regulatory agencies do best, but this has been the longest delay since 2014. It is still possible for ITER to fail. The biggest risk involves disruptions. Sometimes, the plasma in a tokamak becomes unstable and all of the plasma hits the wall at once. This could melt some extremely expensive equipment and take years to repair. If ITER cannot get disruptions under control, then it would be a failed experiment. This is especially challenging because pushing for higher Q makes disruptions more likely. ITER is planning on being extremely cautious: Experiments begin in 2025, but it won't operate at full capacity until 2035. ITER has been the focus of the fusion community now for decades. The Future of Fusion Energy similarly makes ITER the centerpiece of the book. Things. Have. Changed. ITER by itself is not enough to justify the high level of confidence I express at the start. When Parisi & Ball finished writing this book in April 2018, ITER was basically the only game in town. Since then, Things. Have. Changed. Historically, private fusion companies were almost entirely jokes or frauds. They make outlandish claims, use completely different designs so they can't build on the progress of Figure 3, and they can be safely ignored. For example, Lockheed Martin [16] claims that it will take them five years to build a prototype of a fusion power plant that will fit in a truck. They have yet to publish evidence that they have produced a fully ionized plasma. Maybe they're just being secretive, but their design has solid components in the plasma. That won't work. A new generation of private companies have surged into fusion. Leading the charge is Commonwealth Fusion Systems and their tokamak SPARC [17]. Recent advances in high temperature superconductors have been a game changer. They can produce a much stronger magnetic field which allows for better confinement in a smaller experiment. We should now be able to get Q=10 in a medium experiment, which costs ten times less than ITER [18] and is within the reach of private venture capital. Figure 10: Finding the person here is much easier. When the Department of Energy decided to close the third largest plasma experiment in the US, the MIT group which ran it found itself adrift. They founded Commonwealth Fusion Systems in 2018 with a goal of getting fusion within 10 years [19]. Since then, they have built the first ever high temperature superconducting coil in 2019, released their engineering plans for SPARC in 2020, began construction in 2021, and plan on finishing construction in 2025. Commonwealth Fusion had just been founded when Parisi & Ball wrote in 2018. Now they're leading the race to fusion. Several other startups are following SPARC's strategy of using stronger magnetic fields to get fusion in a smaller experiment. They use a variety of designs. Alternative Designs To understand how the alternative designs are different, we need to make sure we understand the basic strategy for getting fusion in a tokamak. Let's run through it again: (A) We want to get lots of fusion reactions … … so we want a large triple product (density * temperature * confinement time). (B) The fusion plasma is too hot to touch solid objects … … so we put it in a magnetic bottle shaped like a doughnut. (C) The particles drift outwards, leaving the bottle … … so we twist the magnetic field with a current in the plasma. I will start with the alternatives that are most similar to a tokamak. For each one, I will list the best experiments that currently exist, where they're located, and the year they began operation. Tokamaks have been better researched than any other strategy. There are currently 10 medium tokamaks: T-10 (Russia, 1975)
2: Speaking of turning money into big positive impacts on the future, Sam Altman writes in to say he enjoyed the recent book review of The Future Of Fusion Energy, and that he predicts Helion (the fusion startup he’s a leading investor in) has a 85% chance of Q > 1 D-T fusion by 2024, and a 65% chance of Q > 1 D-He3 fusion by 2026.
Inline links: book review of, Helion
=3rd: The Future Of Fusion Energy, reviewed by TheChaostician.
Inline links: The Future Of Fusion Energy, TheChaostician
Kora In Hell, reviewed by Lucas Paletta. Lucas is a writer from Buenos Aires, Argentina. He blogs (in Spanish) at www.stackdamage.com.ar. I really enjoyed all of these. A few notes of special praise: The Internationalists was probably most fascinating, in the sense of describing a strange historical episode I didn’t know about before. The Outlier was similar and I give it high marks for making Jimmy Carter interesting. Consciousness And The Brain was a whole new neuroscience theory I knew nothing about and I expect to reread it a bunch of times to try to get it to sink in. Sam Altman sent me an email saying he enjoyed the review of The Future Of Fusion Energy. The Making Nature review did a great job talking about and analyzing a trend I’d never thought about before, far beyond even what was in the book. I think about Exhaustion every time I see a CFS patient - specifically, about the claim that 19th century psychiatrists would prescribe a “West cure” of going off and doing cowboy things on a ranch; I haven’t yet recommended that to anyone, but like I said, I think about it often. God Emperor of Dune and Kora In Hell were the token fiction and poetry reviews; I thought they did a spectacular job overcoming the difficulties of reviewing their respective media. I was reading some of the non-finalists and found 1587 in there and was surprised it hadn’t reached finalist status and decided to promote it; based on your votes it seems like that was the right choice. My process for picking finalists was kind of haphazard; I had you rate all reviews on a scale of 1-10, anyone above 8 got in automatically, and then I picked my favorites from the reviews between 7 and 8. This was sort of unfair, and meant there were some reviews that scored better on the voting than finalists but weren’t finalists themselves, and others that I liked better than some finalists but couldn’t pick. All of these are Honorable Mentions. You’ll notice some of them are politically charged, and yes, I did sort of discriminate against these (though not so much that I wouldn’t have picked them if they’d made it above 8). They are: Unsettled, reviewed by Julius S. Julius is a machine learning engineer from San Diego. He blogs at Curious About Ideas.