General Fusion Achieves Milestone with New Fusion Reactor

General Fusion Achieves Plasma Creation in Prototype Reactor

General Fusion recently announced the successful generation of plasma, the superheated fourth state of matter essential for fusion, within a prototype reactor. This achievement initiates a 93-week program aimed at validating the feasibility of the company’s unique approach to fusion power.

Lawson Machine 26: A New Iteration

The reactor, designated Lawson Machine 26 (LM26), represents General Fusion’s newest development in a series of devices designed to test components of its innovative methodology. LM26 was assembled within a timeframe of just 16 months, and the company anticipates reaching “breakeven” conditions by 2026.

A Long-Standing Player in Fusion Research

Founded in 2002, General Fusion is among the longest-running fusion companies currently in operation. To date, the company has secured $440 million in funding, as reported by PitchBook. Throughout its history, it has observed the emergence and decline of competitors, and, mirroring the broader fusion industry, has previously missed targets for achieving breakeven, including a commitment made over two decades ago.

Understanding Fusion Breakeven

Within the realm of fusion power, the term “breakeven” is defined by two distinct benchmarks. The more commonly understood definition is commercial breakeven. This occurs when a fusion reaction generates more power than the entire facility consumes, enabling the power plant to contribute electricity to the power grid. Currently, no facility has attained this level of performance.

The second benchmark is referred to as scientific breakeven. Here, the fusion reaction must produce at least as much power as was directly supplied to the fuel. Scientific breakeven focuses solely on the experimental system, excluding the energy consumption of the broader facility. However, it remains a crucial milestone in any fusion endeavor. To this point, only the National Ignition Facility, operated by the U.S. Department of Energy, has achieved this.

Magnetized Target Fusion: A Distinct Approach

General Fusion’s method for achieving fusion power diverges considerably from that of other startups. Known as magnetized target fusion (MTF), it shares similarities with inertial confinement, the technique employed by the National Ignition Facility in late 2022 to demonstrate that fusion reactions can yield more energy than required to initiate them.

How MTF Works: Pistons and Plasma

While the National Ignition Facility utilizes lasers to compress a fuel pellet, General Fusion’s MTF reactor relies on steam-driven pistons. Within the reaction chamber, deuterium-tritium fuel is initially energized with electricity to create a magnetic field, which serves to contain the plasma. Subsequently, the pistons drive a liquid lithium wall inward, compressing the plasma.

This compression elevates the fuel’s temperature until it reaches the point of initiating a fusion reaction. The resulting reaction then heats the liquid lithium, which the company intends to circulate through a heat exchanger to produce steam and power a generator.

Origins of MTF Technology

MTF technology originated in the 1970s at the U.S. Naval Research Laboratory, where researchers were exploring concepts for compact fusion reactors. These initial efforts did not yield successful results. General Fusion attributes this to insufficient precision in controlling the pistons compressing the liquid liner, suggesting that modern computing capabilities now offer a greater opportunity to execute the necessary complex control sequences.

Future Challenges and Developments

Regardless of LM26’s ultimate accomplishments, General Fusion faces ongoing challenges. The current device does not incorporate the liquid lithium wall, instead utilizing solid lithium compressed by electromagnets. This limitation restricts the number of test runs possible due to the longer reset times. The company has made advancements in a prototype liquid wall, conducting over 1,000 tests to assess its durability, but full integration remains a significant engineering undertaking.

Racing to Deliver Fusion Power

The activation of LM26 represents a substantial advancement for General Fusion as it competes with a growing number of companies, all striving to deliver functional power plants with substantial financial backing and ambitious schedules.