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Scientists at the DIII-D National Fusion Facility in San Diego, California, have released a new design for a compact fusion reactor that can generate electricity and help define the technology necessary for commercial fusion power. The approach is based on the "Advanced Tokamak" concept pioneered by the DIII-D program, which enables a higher-performance, self-sustaining configuration that holds energy more efficiently than in typical pulsed configurations, allowing it to be built at a reduced scale and cost.

"The key to our approach is to raise the pressure inside the tokamak," said project lead Dr. Richard Buttery. "This makes more fusion occur, allowing us to reduce the current, which in turn makes the plasma easier to sustain and more stable. Our simulations show that by carefully shaping the plasma and moving the current toward its edge, we can suppress turbulent heat losses and support higher pressures at lower currents, to reach a state where the plasma sustains itself. This enables a device that can simply be turned on, generating electricity continuously in a steady state."

Read the General Atomics press release .

A new video issued by Fusion for Energy, the European Domestic Agency, takes us onto the shop floor at Walter Tosto where three ÌÇÐÄÆƽâ°æ vacuum vessel sectors are in various stages of fabrication.

Each 440-tonne sector is formed from four segments, and each segment requires the same step-by-step fabrication route: contractors form and weld the inner shell, attach inner ribs and support housings, install in-wall shielding blocks, and—in the final activity to complete the segments—fit and weld the outer shell.

Europe—responsible for delivering five sectors to ÌÇÐÄÆƽâ°æ—is working with the AMW Consortium (Ansaldo Nucleare, Mangiarotti, Walter Tosto) and an extensive network of European subcontractors. At Walter Tosto, in Chieti, Italy, teams are currently finalizing dimension checks on the sub-parts of sector #5, and completing welding on the segments of sectors #4 and #9.

Watch the two-minute video .