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Latest ITER Newsline

  • Cryostat thermal shield | A "strong back" for a fragile component

    The lower cylinder thermal shield is a large silver-plated component, circular in shape and five metres tall, which fits inside the depression in the cryostat b [...]

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  • Diagnostic shielding | B4C ceramic bricks prove their worth

    A number of materials can effectively shield diagnostic equipment from the neutron flux coming from the plasma. To find the best one, the diagnostics team at IT [...]

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  • Image of the week | The cryostat top lid, batch after batch

    Batch after batch, the elements for the top lid of the ITER cryostat keep arriving from India. As of today, 7 out of the 12 required segments have been delivere [...]

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  • Cooling water system | The tanks within a tank

    Deep inside the bowels of the Tokamak Building, the entrance to one of most spectacular rooms of the whole installation resembles that of a broom cupboard. [...]

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  • ITER assembly | Last major assembly contract signed

    One year after finalizing two major machine assembly contracts, the ITER Organization has chosen the contractors who will carry out assembly and installation ac [...]

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Of Interest

See archived entries

An unconventional approach to fusion

There's no easy road to fusion. Whether one travels the large route forged by six decades of research on hundreds of machines, or whether one tries to open a way through uncharted and exotic territory, difficulties abound and challenges loom large.

General Fusion's approach is quite exotic: no vacuum vessel in their planned fusion machine but a spherical tank filled with a liquid lead-lithium mixture spun into a vortex; no giant superconducting magnet system to confine the plasma but an array of pistons to compress it by way of a powerful shock wave... (Click to view larger version...)
General Fusion's approach is quite exotic: no vacuum vessel in their planned fusion machine but a spherical tank filled with a liquid lead-lithium mixture spun into a vortex; no giant superconducting magnet system to confine the plasma but an array of pistons to compress it by way of a powerful shock wave...
Over the past few years, several private sector startups have raised enough capital to launch their scientists and engineers into the race to harness fusion power. Tri Alpha Energy and Helion Energy in the US; Tokamak Energy and First Light Fusion in the UK; General Fusion in Canada and scores of others ... all claim they can deliver within the coming decade.

How they can succeed with a few tens or hundreds of million dollars in investment and a workforce that rarely exceeds a few dozen specialists is an open question—one that everyone present in the ITER amphitheatre on Monday 23 January had in mind.

The guest that day was physicist Michel Laberge, founder and chief scientist of General Fusion, the company that boasts it is ─ in the present tense ─ "transforming the world's energy supply with clean, safe and abundant fusion energy".

There is a world, of course, between the claim inscribed on the opening page of General Fusion's website and the present status of the company's research and experimentation. Facing a receptive and curious audience of fusion specialists, Laberge didn't seek to minimize the technical challenges his company is facing.

For anybody familiar with magnetic fusion and tokamaks, General Fusion's approach is quite exotic: no vacuum vessel in their planned fusion machine but a spherical tank filled with a liquid lead-lithium mixture spun into a vortex; no giant superconducting magnet system to confine the plasma but an array of pistons to compress it by way of a powerful shock wave...

Physicist Michel Laberge, founder and chief scientist of General Fusion, didn't seek to minimize the technical challenges his company is facing. (Click to view larger version...)
Physicist Michel Laberge, founder and chief scientist of General Fusion, didn't seek to minimize the technical challenges his company is facing.
The concept, called "magnetized target fusion" originated in the mid-1970s. It combines features of magnetic confinement fusion (like in ITER and other tokamaks) and inertial confinement fusion (like in the US National Ignition Facility or the French Laser Mégajoule).

"We aim to do fusion somewhere in the middle ground," said Laberge in his introduction. Supported by detailed graphs, high-speed videos and precise figures, his presentation and the ensuing exchanges were highly technical and at no moment was there any hint of condescendence or irony—from either side of the podium.

The encounter between the largest science project on the planet and a small, determined startup in western Canada, demonstrated that, at the end of the day, the fusion community—dreamers, explorers, experimenters—is really just one.


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