Tag Archives: fusion

December 2025 in Review

Leave a reply

2025 is in the books! I covered a number of “best of” posts by others in December so I will highlight a few of those below. I still have some “best of” posts queued up so they will continue to roll out in January.

Most frightening and/or depressing story: Global progress on poverty reduction stalled around 2020. Gains in Asia are offset by losses in Africa. Meanwhile, gains in crop yields may have plateaued and are expected to decline as climate change drives increasingly extreme weather.

Most hopeful story: From Our World in Data, carbon dioxide emissions in the US and most developed countries peaked around 2006 and have been falling. Global internal combustion engine vehicles peaked around 2018, while electric vehicle sales are rising. Renewable electricity generation is growing exponentially as costs of existing technology fall, and there are some promising advances in materials science that could improve wind turbines and batteries. There is hope for fusion power, although it still seems to be the proverbial two decades away.

Most interesting story, that was not particularly frightening or hopeful, or perhaps was a mixture of both: BBC lists 25 most important scientific ideas of the 21st century. Highlights include various genetic technologies (stem cells that don’t come from babies, mRNA vaccines, tissue engineering for human organ transplants), attribution analysis, and of course large language models. Science magazine echoes some of these and adds gene editing, new antibiotics, and progress on heat-resistant rice strains as 2025 breakthroughs.

what’s new with fusion?

Leave a reply

One thing that’s new, according to the New York Times, is massive investment in R&D by the government of China. Meanwhile in the U.S., it’s more about startups and public-private partnerships. In at least one anecdotal case mentioned in the article, top scientists from China who have been based at top U.S. universities for decades are choosing to go home. The article suggests that American firms are often the first to achieve breakthroughs, but the Chinese system is better at scaling and commercializing them.

It seems like there is an opportunity to cooperate for the greater good here, no? That is not the way the political winds are blowing at the moment, of course. At least in this case, if our countries aren’t actually cooperating, they are not competing to weaponize the technology first. This technology was weaponized more than half a century ago, of course, and the quest ever since has been to learn how to control it for peaceful purposes. Of course, the joke is always that commercial fusion is two decades away, no matter what decade we are currently in. This article declines to give a clear time table for widespread commercialization, but it talks about a “pilot plant in the 2030s and 2040s”, so yep the rolling two decade projection seems to be holding.

January 2024 in Review

Most frightening and/or depressing story: 2023 was “a year of war“, and so far 2024 is not looking better. Those diplomatic grand bargains you always hear about seem to be getting less grand. And the drumbeat for a U.S. attack on Iran got louder.

Most hopeful story: According to Bill Gates, some bright spots in the world today include gains in administering vaccines to children around the world, a shift toward greater public acceptance of nuclear power, and maybe getting a bit closer to the dream of fusion power. He pontificates about AI, and my personal sense is it is still too soon, but AI does hold some promise for speeding up scientific progress.

Most interesting story, that was not particularly frightening or hopeful, or perhaps was a mixture of both: The return of super-sonic commercial flight is inching closer.

November 2019 in Review

Most frightening and/or depressing story:
  • The Darling, a major river system in Australia, has essentially dried up.
Most hopeful story: Most interesting story, that was not particularly frightening or hopeful, or perhaps was a mixture of both:

the latest on fusion power

According to the Washington Post, there are looming breakthroughs in fusion.

But the technical challenges of essentially creating an artificial mini-star have been daunting. Scientists have made fusion happen with various approaches, but more energy was expended in those experiments than was released. The turning point will come when more energy is produced than goes in.

The roadblocks have started to fall away in recent years, thanks to the use of supercomputers to model and optimize the design of fusion systems, and to a new generation of superconductors that increase the magnetic fields that contain the artificial star, thereby dramatically decreasing the required size of fusion devices. Advanced manufacturing techniques for specialized fusion materials have also been developed.

Washington Post

The title of the article is “The fusion energy dream is inching toward planet-saving reality”. Would this “save the planet”. Well, if it were clean, cheap, and safe, it could move us closer to that world of abundance some envision. The problem with fission has been that the infrastructure required to make it safe has been so big, complicated, and costly, that by the time it can be put into place it is already obsolete by a decade or more. And then there is the weaponization problem which has prevented widespread use in poor countries.

Let’s assume it will be clean, cheap, and safe. It could solve our carbon emission problems, air pollution problems, and generally free up a lot of resources for other things, making us quite a bit richer. Whole industries would be created and destroyed, which we could expect to cause some political and financial turmoil. It wouldn’t solve our land use, biodiversity, or water pollution problems.

January 2019 in Review

After blogging pretty consistently daily for years, I’ve finally slowed this blog down to every other day due to the realities of work and family. Maybe I’ll get back to daily in a couple years. In the meantime, I’m going to pare my “month in review” posts to highlight three items, because it wouldn’t really make sense to do a Top 9 out of 15.

Most frightening and/or depressing story:

  • Writing in 1984, Isaac Asimov thought we would be approaching world peace, living lives of leisure, children would love school, and we would be mining the moon and manufacturing things in orbital factories by now.

Most hopeful story:

Most interesting story, that was not particularly frightening or hopeful, or perhaps was a mixture of both:

  • Some in the U.S. Senate and military take UFOs seriously.

 

the latest on fusion power

The dream of fusion power is not dead. In fact, the science is apparently pretty straightforward but the technology of containing the plasma safely is not. Past attempts have focused on trying to contain the plasma inside a doughnut-shaped “tokamak” but there are some new ideas on that.

Fusion nuclear science facilities and pilot plants based on the spherical tokamak

A fusion nuclear science facility (FNSF) could play an important role in the development of fusion energy by providing the nuclear environment needed to develop fusion materials and components. The spherical torus/tokamak (ST) is a leading candidate for an FNSF due to its potentially high neutron wall loading and modular configuration. A key consideration for the choice of FNSF configuration is the range of achievable missions as a function of device size. Possible missions include: providing high neutron wall loading and fluence, demonstrating tritium self-sufficiency, and demonstrating electrical self-sufficiency. All of these missions must also be compatible with a viable divertor, first-wall, and blanket solution. ST-FNSF configurations have been developed simultaneously incorporating for the first time: (1) a blanket system capable of tritium breeding ratio TBR  ≈  1, (2) a poloidal field coil set supporting high elongation and triangularity for a range of internal inductance and normalized beta values consistent with NSTX/NSTX-U previous/planned operation, (3) a long-legged divertor analogous to the MAST-U divertor which substantially reduces projected peak divertor heat-flux and has all outboard poloidal field coils outside the vacuum chamber and superconducting to reduce power consumption, and (4) a vertical maintenance scheme in which blanket structures and the centerstack can be removed independently. Progress in these ST-FNSF missions versus configuration studies including dependence on plasma major radius R 0 for a range 1 m–2.2 m are described. In particular, it is found the threshold major radius for TBR  =  ${{R}_{0}}\geqslant 1.7$ m, and a smaller R 0  =  1 m ST device has TBR  ≈  0.9 which is below unity but substantially reduces T consumption relative to not breeding. Calculations of neutral beam heating and current drive for non-inductive ramp-up and sustainment are described. An A  =  2, R 0  =  3 m device incorporating high-temperature superconductor toroidal field coil magnets capable of high neutron fluence and both tritium and electrical self-sufficiency is also presented following systematic aspect ratio studies.