• ITER Reaches 50% Completion Mark on the Path to First Plasma in 2025

    The International Thermonuclear Experimental Reactor (ITER), a project to prove that fusion power can be produced on a commercial scale and is sustainable, is now 50% built to initial operation. ITER will use hydrogen fusion, controlled by a massive superconducting magnet being fabricated by General Atomics in San Diego, to produce heat energy. In the commercial machines that will follow, this heat will drive turbines to produce electricity.

  • Building the Heart of ITER

    General Atomics is building the ITER Central Solenoid – the five-story, 1,000-ton magnet that will be at the center of the international fusion energy experiment being constructed in southern France. A recent video released by U.S. ITER shows how GA is supporting ITER, an unprecedented international collaboration of scientist and engineers working to design, construct and assemble a burning plasma experiment that can demonstrate the scientific and technological feasibility of fusion power.

  • The Future of Fusion Energy

    The United States, along with 34 other nations, is making a massive investment in time and money to help to build a huge experimental nuclear fusion reactor in the south of France that bills itself as one of the most ambitious energy projects in the world today – and General Atomics is a key member of the team making it happen.

  • General Atomics Completes Heat Treatment of ITER’s First Central Solenoid Module

    Today General Atomics (GA) reached another key milestone in the fabrication of the ITER Central Solenoid as engineers and technicians at GA’s facility officially completed heat treatment of the first module. 

  • General Atomics’ Qualification Coil for ITER’s Central Solenoid is Now Fully Insulated

    Because ITER’s Central Solenoid is subject to fault voltages up to 14,000 volts and must be tested at 30,000 volts, successful ground insulation of the coils is a vital step in the fabrication process of the modules.

  • Central Solenoid Fabrication: a Photo Reportage from ITER Newsline

    Inside of a purpose-built facility at General Atomics in California (US), ten customized workstations for central solenoid production…

  • Secretary of Energy Moniz Urges Continued Work on ITER Fusion Reactor

    General Atomics is Building ITER’s Central Solenoid, the Heart of the Fusion Reactor

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General Atomics is fabricating one of the world's largest and most powerful superconducting magnets for ITER – an unprecedented scientific collaboration of 35 nations. The Central Solenoid is the heart of ITER. The 5-story, 1,000-ton magnet will drive 15 million amperes of electrical current in ITER's fusion plasma for stabilization. Each coil will be 7 feet tall and 14 feet wide with 4 miles of superconducting cable, powering ITER in its quest to prove that nuclear fusion – the process that powers the stars – can produce virtually limitless safe, clean and renewable energy.


  • Winding: Forming a module from 3.5 miles of conductor. The conductor consists of Niobium-Tin superconducting cable in a 2" square stainless steel jacket
  • Heating: Formed module is processed in a convection furnace to create the superconducting alloy. The month long process includes heating to 1200º F with constant temperature hold times exceeding 350 hours
  • Insulating: The 560 turn coil is lifted and each turn separated to allow for wrapping of six layers (180 miles) of insulating tape
  • Encapsulating: Coil is placed in a mold then heated and injected with resin
  • Testing: Magnet coils are cooled to -450°F (4°K) and tested at a current of 48,500 Amps to simulate ITER operations


  • Low energy loss, high-power microwave transmission line components
  • Software for real-time plasma control
  • Methods to prevent uncontrolled collapse of ITER plasmas and high energy bursts from plasma edge using internal stabilization coils
  • Low Field Side Reflectometer: A diagnostic using microwaves to measure plasma density profiles
  • Wide Angle Visible & Infrared Viewing System: Set of diagnostic cameras to monitor for hot spots in ITER plasma chamber
  • Toroidal Interferometer Polarimeter: Diagnostic to measure plasma density distribution
  • Archiving methods for storing multi-gigabytes of ITER experimental data