# Acceleron Fusion, Inc.

> Acceleron Fusion is a Cambridge, Massachusetts deep-tech company reviving muon-catalyzed fusion, a phenomenon first observed in the 1950s, as a path to abundant clean energy. Instead of confining a 100-million-degree plasma, Acceleron fires a beam of muons - subatomic particles roughly 200 times heavier than electrons - at highly compressed deuterium-tritium fuel, triggering fusion at temperatures closer to 500-1,000 C. Founded in 2023 by NK Labs veterans Ara Knaian and Seth Newburg and backed by a $24M Series A from Lowercarbon Capital and Collaborative Fund, the company is building two core technologies: a high-efficiency muon source and a high-density fusion cell, with the goal of a fusion power plant that beats natural gas on cost.

- **Founded:** 2023
- **Headquarters:** Cambridge, Massachusetts, United States
- **Founders:** Ara Knaian (Co-founder & CEO), Seth Newburg (Co-founder & President)
- **Team size:** ~17 employees
- **Products:** High-efficiency muon source, High-density fusion cell
- **Notable:** Closed a $24M Series A led by Lowercarbon Capital and Collaborative Fund (December 2024)., Ran its machine with highly compressed deuterium-tritium fuel, capturing data on 28 hours of continuous fusion., Logged more than 100 hours of testing with deuterium prior to the D-T runs.

## Products & services

- **High-efficiency muon source** — An intense beam generator designed to produce muons using significantly less energy than existing accelerator facilities - the central technical bottleneck that has historically made muon-catalyzed fusion uneconomical.
- **High-density fusion cell** — A reactor chamber holding deuterium-tritium fuel under extreme pressure, engineered to maximize the number of fusion reactions each muon can catalyze before it decays or sticks to a helium nucleus.

## Achievements

- Closed a $24M Series A led by Lowercarbon Capital and Collaborative Fund (December 2024).
- Ran its machine with highly compressed deuterium-tritium fuel, capturing data on 28 hours of continuous fusion.
- Logged more than 100 hours of testing with deuterium prior to the D-T runs.
- Achieved fusion at higher fuel pressures than previously demonstrated for muon-catalyzed fusion.
- Grew out of ARPA-E-funded research at NK Labs into a venture-backed company within roughly three years.
- Targets a levelized cost of electricity of about $0.025/kWh, undercutting natural gas.

## Latest updates

- **2024-10** — Achieved a technical milestone running its machine with highly compressed deuterium-tritium fuel, capturing 28 hours of continuous fusion data after 100+ hours of deuterium testing.
- **2024-12** — Closed $24M Series A led by Lowercarbon Capital and Collaborative Fund to advance its muon source and fusion cell toward a pilot plant.
- **2025-07** — Co-founder Seth Newburg presented Acceleron's muon-catalyzed fusion program at the ARPA-E Fusion Programs Annual Meeting.

## Links

- Website: https://acceleron.energy
- LinkedIn: https://www.linkedin.com/company/acceleron-fusion

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Last updated: 2026-06-10