{
  "id": 14286151,
  "title": "Cambridge Heavy Industries has been quietly building a desktop fusion device",
  "url": "https://urgent.news/2026/10/13/cambridge-heavy-industries-has-been-quietly-building-a-desktop-fusion",
  "topic": "tech",
  "section": "Tech",
  "published": "2026-10-13T20:13:53.000Z",
  "source": {
    "name": "TechCrunch",
    "slug": "techcrunch",
    "url": "https://techcrunch.com/2026/10/13/cambridge-heavy-industries-has-been-quietly-building-a-desktop-fusion-device/"
  },
  "original_language": "en",
  "account": "Cambridge Heavy Industries, a startup based in Cambridge, Massachusetts, has been developing a compact fusion device that can operate on a desktop. The company, which has been working in secrecy from a laboratory near MIT, has unveiled its technology through a video conference. Co-founder and CEO Yun Kai explained that the company designed a \"small modular reactor,\" emphasizing that its miniaturization simplifies the process. This compact size enables the company to conduct numerous experiments daily, offering an agile approach that has piqued the interest of investors. Cambridge Heavy Industries raised $6.2 million in seed funding from several investors, including Azolla Ventures, Overlay, Neta Foundation, P3A, MassCEC, and the Rothrock family. Their fusion reactor operates using lasers to compress a fuel target, similar to a previous experiment that demonstrated controlled fusion could generate more power than consumed. However, unlike other inertial confinement designs, Cambridge Heavy's system minimizes the number of lasers needed to initiate fusion. The device utilizes two main lasers to ignite the fuel target. These lasers are split into multiple beams, which are directed in concentric rings onto a flat, round fuel target, compressing it successively. As the compression wave reaches the center, a laser activates the target, generating heat and magnetic fields, leading to fusion. This innovative design generates high pressures with relatively low laser power, according to Kai. The team behind Cambridge Heavy Industries aims to build a power plant based on this technology within the next decade. However, the current prototype remains a benchtop device, significantly smaller than other fusion power plants, which are expected to be approximately the size of two basketball courts. The primary goal of this miniaturized device, in the short term, is to produce tritium, a scarce and expensive isotope of hydrogen crucial for most fusion power plants. Currently, tritium costs around $30,000 per gram, and given its rarity, only about 40 kilograms exist globally. The fusion power industry is projected to face a shortage of approximately 28 kilograms of tritium by 2054, valued at around $840 million.",
  "summary": "Fusion power startup Cambridge Heavy Industries is building a small, laser-powered fusion device to fuel the coming wave of fusion power plants.",
  "key_points": [],
  "editors_take": null,
  "illustration": null,
  "coverage": {
    "outlets": 1,
    "also_reported_by": []
  },
  "ai_generated": true,
  "disclaimer": "Summaries, key points and the editor’s take are written by software from other outlets’ reporting and may contain errors — always check the linked original."
}