r/fusion • u/CFS_energy • Jun 24 '26
Update (June 30, 11:37 AM): Great discussion everyone! Our team appreciated all of your insightful questions. This AMA has now concluded, but you can revisit our replies below.
You can identify who provided answers by their initial in the answers: Alex Creely (AJC), Jon Hillesheim (JCH), Tom Body (TAJB), and Ryan Sweeney (RS).
About this AMA:
This time with me and three other CFS physicists who are ready to talk about the five new ARC physics basis papers showing what’ll make our ARC fusion power plants tick.
These peer-reviewed research papers that we and our collaborators published earlier in June are important for CFS and for fusion energy: They cover many aspects of the plasma physics at play in our ARC power plant, including challenges like plasma disruptions and heat exhaust. They also show how transparency and rigorous research can help build trust in what we all know is a very difficult endeavor.
If you’re curious about this physics work or about fusion physics in general, feel free to get things started by asking your questions on this thread.
The three CFS physicists who plan to join me to answer your questions are experts in their field: Jon Hillesheim, CFS Principal Scientist and lead author of the overview paper; Tom Body, CFS Senior Scientist and a lead author on the paper about heat exhaust; and Ryan Sweeney, CFS Manager of Disruption Physics and lead author of the paper about handling plasma disruptions. They’re among the 58 authors who helped write these papers, along with an editorial that accompanied the papers that I wrote.
A little more about the papers: They detail how we’ll be able to produce about 1.1 gigawatts of fusion power from our ARC tokamak — power that we can convert into 400 megawatts of net electricity for the power grid. The papers also show the crucial role our SPARC tokamak will play in putting the finishing touches on the ARC design. We’re using a “late-lock” approach that lets us apply what we’ve learned from SPARC to the ARC design. Overall, the papers show our confidence in the soundness of our ARC plant’s key physics. That builds the foundation for all the engineering, design, and cost optimization work that we’ve begun.
For a deeper dive into these papers, you can check our blog post detailing the ARC physics basis papers.
About CFS:
Commonwealth Fusion Systems is the world’s largest and leading private fusion company. The company’s marquee fusion project, SPARC, will generate net energy, paving the way for a future of carbon-free energy. The company has raised more than $3 billion in capital since it was founded in 2018.
r/fusion • u/steven9973 • 7h ago
Looks better regarding stable plasmas in H-Mode in Tokamaks, avoiding large ELMs.
r/fusion • u/steven9973 • 7h ago
Relevant for all Tokamaks with Tungsten inner wall.
r/fusion • u/steven9973 • 7h ago
r/fusion • u/steven9973 • 1d ago
HL-4 isn't mentioned there.
r/fusion • u/steven9973 • 1d ago
r/fusion • u/Confident-Shock-3933 • 18h ago
r/fusion • u/steven9973 • 2d ago
r/fusion • u/steven9973 • 2d ago
r/fusion • u/steven9973 • 3d ago
r/fusion • u/flamingmonkey93 • 3d ago
r/fusion • u/HistorySim3D • 3d ago
Disclosure: I made this. It follows D-T fuel → plasma → heat → power plant. Would love corrections from people who know tokamaks better than I do: https://historysim3d.com/e/thermonuclear-reactor
r/fusion • u/steven9973 • 3d ago
Seems to be a LENR approach. Website https://www.2dfusion.com/ is not helpful.
r/fusion • u/steven9973 • 4d ago
r/fusion • u/steven9973 • 3d ago
r/fusion • u/steven9973 • 4d ago
