Full Breakdown
General Fusion’s LM26 Reaches 1 keV Electron Temperature, First Mechanical-Compression Fusion Milestone
By Drooid · · How we work
Breakthrough Achievement
General Fusion announced that its experimental prototype, the Lawson Machine 26 (LM26), achieved electron temperatures of 1.1 kiloelectronvolts (keV)—equivalent to more than 12 million °C—just before peak compression. Surpassing the 1 keV threshold is an internationally recognized benchmark that only a handful of fusion experiments have previously attained. The company framed the result as a step toward a commercial plant within the next decade.
Technical Approach and Diagnostics
Unlike most contemporary fusion projects that rely on massive superconducting magnets or high-energy lasers, LM26 employs Magnetized Target Fusion (MTF) with low-speed, physical compression. Magnetically confined plasma is injected into a chamber and compressed over several milliseconds by a contracting solid metal liner, eliminating the need for delicate, rare materials. To verify the temperature inside the tightly sealed liner, General Fusion partnered with the UK Atomic Energy Authority (UKAEA). Engineers used Thomson scattering—laser light directed through the plasma—to infer particle energies, and a custom polychromator built at UKAEA’s Diagnostic Innovation Center of Excellence captured the scattered light. Data from the test have been posted on General Fusion’s portal and submitted for peer-reviewed publication.
Verbatim Quotes
“General Fusion has a two-decade track record of achieving industry-first milestones in Magnetized Target Fusion supported by a substantial body of peer-reviewed scientific literature,” — Greg Twinney, Chief Executive Officer at General Fusion
What’s Next
Technicians are presently refitting LM26 to increase compression capability, aiming for electron temperatures of 10 keV (approximately 100 million °C), the level required for net electricity production. The Vancouver-based firm continues to receive backing from Canada’s Strategic Response Fund and advisory support from U.S. firm General Atomics as it advances toward that goal.