Zap Energy, a Seattle-based startup, has unveiled its latest fusion device, Fuze-3, which has achieved record-breaking plasma pressures. The announcement was made at a research meeting in Long Beach, California, marking a significant milestone in the company's ambitious pursuit of bringing commercial fusion power to market.
The company is part of a competitive landscape of startups racing to develop fusion power plants capable of supplying electricity to the grid by the early 2030s. Fuze-3, operating at Zap Energy's headquarters, has been firing pulses of plasma, with the experimental results poised to inform the design of future demonstration plants.
Record-Breaking Performance
The Fuze-3 device successfully compressed a superheated "soup" of charged particles, known as plasma, to more than 232,000 psi (1.6 gigapascals) and heated it to over 21 million degrees F (11.7 million degrees C). This pressure data represents a new record for the specific type of fusion Zap Energy is developing: sheared-flow-stabilized Z-pinch.
Zap Energy's reactor design utilizes electrodes to channel electricity through plasma. This process generates a magnetic field that, when sufficiently strong, heats and compresses the plasma to the extreme conditions necessary for atomic particles to fuse, releasing energy.
While these figures are crucial for Zap Energy's progress toward commercial fusion, it's important to note that they are not directly comparable to results from other fusion startups due to the diverse approaches being explored across the industry.
The Path to Commercial Fusion
Achieving high-pressure plasmas is fundamental for any future fusion power plant. To generate more power than they consume, fusion reactions must reach what is known as the "triple product"—a metric encompassing the plasma's temperature, pressure, and duration within the reactor. Essentially, a plasma must be hot enough, dense enough, and sustained long enough to produce net energy.
According to Zap Energy's own calculations, the company still needs to increase its plasma pressure by at least tenfold to reach scientific breakeven, a critical milestone achieved by only one other fusion experiment to date. The company also stated it is nearing a key third milestone, as proposed by Bob Mumgaard, co-founder and CEO of competitor Commonwealth Fusion Systems.
Innovative Reactor Design
The record for plasma pressure was broken by modifying the reactor design to incorporate a third electrode. Previous designs, which used two electrodes, could adequately heat the plasma but struggled to achieve the desired pressure levels.
While Zap Energy did not disclose specific details of the new design, spokesperson Andy Freeborn explained that the addition allows the company to utilize two power banks. This provides enhanced control over the plasma's behavior inside the reactor.
"The plasma chamber itself doesn't look much different, but it's operated very differently since there are two pulses of input power rather than one," Freeborn stated.
Looking ahead, Zap Energy is already developing a new generation of its Fuze device, which is anticipated to come online this winter, further advancing its mission to harness fusion power.
