Pacific Fusion: Building a Fusion Power Plant - Plans & Progress

Pacific Fusion's Approach to Fusion Energy

In October, Pacific Fusion garnered significant attention upon its emergence from stealth mode, securing $900 million in Series A funding. Leading the company is a team spearheaded by a scientist renowned for contributions to the Human Genome Project.

Revealing the Underlying Physics

The startup is now detailing the scientific principles that will guide the construction of its fusion reactor.

“We are releasing a comprehensive technical roadmap,” stated Will Regan, co-founder and president of Pacific Fusion, in an interview with TechCrunch. “This document outlines the system details that will enable us to achieve a 100-fold increase in energy gain compared to the [National Ignition Facility], at roughly one-tenth of the cost.”

Long-Term Vision

The company acknowledges that realizing a commercially viable reactor is a long-term endeavor, estimating approximately a decade until the first operational unit is available.

Inertial Confinement Fusion

Pacific Fusion’s methodology aligns with the approach utilized by the National Ignition Facility (NIF), a Department of Energy research initiative. The NIF was the first to demonstrate controlled fusion capable of generating more energy than required for initiation. This technique, known as inertial confinement, involves compressing fuel to a density where atomic fusion occurs, releasing substantial energy.

However, while the NIF employs lasers for fuel compression, Pacific Fusion intends to utilize a powerful electrical pulse directed at a target. This pulse will generate a magnetic field, causing a shell surrounding the fuel to compress within approximately 100 nanoseconds.

The Power Source: Impedance-Matched Marx Generators

The generation of this electricity will be accomplished through 156 impedance-matched Marx generators (IMG), or pulser modules. This power source was originally conceived by co-founder Keith LeChien and colleagues. Collectively, these modules deliver 2 terawatts for a duration of 100 nanoseconds. “This represents approximately four times the average power consumption of the entire U.S. electrical grid,” Regan explained.

Module Construction

Each pulser module is comprised of repeating elements. It contains 32 “stages,” which are essentially metallic rings encircled by 10 “bricks.” Each brick incorporates a switch and two capacitors, serving as short-term energy storage components.

Precise synchronization is crucial to ensure that electricity from each brick reaches the fuel pellet simultaneously. A single capacitor discharges its entire energy content in roughly 100 nanoseconds, according to Regan. “Our IMG, a modified Marx generator, is inherently designed for fast pulses,” he stated. “Timing consistency is maintained throughout the system via synchronization.”

Reaction Chamber and Compression

Following discharge, the electricity travels through cables from each pulser module to the reaction chamber, which is maintained under vacuum conditions. Within the chamber, the electrical surges converge on the target, applying electromagnetic force to compress it until fusion is achieved.

Progress and Funding

Pacific Fusion reports being “several months ahead of schedule,” having successfully developed the necessary simulation models and completed prototypes of the bricks and stages. This progress unlocks the next tranche of their $900 million funding, earmarked for constructing a complete pulse module, or IMG.

“Upon completion of this module, we will replicate it 150 times to create the full system,” Regan said.

Funding Structure

The substantial Series A funding is not released in a single sum. Instead, it is disbursed incrementally as the company achieves predefined milestones. This phased funding approach, common in the biotechnology sector, was facilitated by investors at General Catalyst, CEO Eric Lander, and COO Carrie von Muench, all of whom were familiar with the model.

New Leadership

Pacific Fusion has also recently appointed Sachin Desai as its general counsel, as exclusively revealed to TechCrunch. Desai previously held the same position at Helion, a competitor in the fusion energy space.

Regulatory Landscape

Fusion energy faces fewer regulatory hurdles than fission, and the passage of the Advance Act in July 2024 provided further clarity, establishing a distinct regulatory framework for fusion compared to fission.

However, given the absence of existing commercial fusion reactors, numerous questions remain unanswered.

“It is vital that we actively participate in discussions as regulations are developed,” Regan emphasized. “This will be an ongoing process.”