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It is inscribed in bold letters on the large poster that is affixed to the ITER Assembly Hall: harnessing fusion energy is akin to "bringing the power of the Sun to Earth."

And it is true: like the Sun, the ITER Tokamak will produce energy by fusing hydrogen nuclei into helium.

The fusion reaction in our machine, however, is not like that which occurs in Sun-like stars. Although the end product (helium) and the ingredients (hydrogen isotopes in one case, hydrogen in the other) are the same, the nature of the process is profoundly different.

In a recent article on the Forbes website astrophysicist Ethan Siegel explains how "hydrogen-fusing-into-helium makes up less than half of all nuclear reactions in our Sun," and how the nuclear physics in stellar bodies abounds in "strange, unearthly phenomena."

The inscription on the Assembly Hall remains nonetheless true. ITER is indeed "bringing the power of the Sun to Earth." It's just that stars and tokamaks have different ways of obtaining a similar result.

Click here to read the full Forbes.com article.

An international team of fusion experts working at the DIII-D National Fusion Facility in San Diego, California, has discovered a way to minimize the effects of a phenomenon that can decrease the performance of fusion reactors and even possibly cause damage to the device. This work shows that localized electron heating by microwaves is an effective tool for modifying Alfvén eigenmode activity in DIII-D and other devices worldwide.

Alfvén waves can cause redistribution or loss of the injected neutral beam ions that are needed to heat fusion devices and of the helium nuclei (alpha particles) produced by the fusion reaction that also contribute to the continued heating of the plasma. If left to grow unabated, the Alfvén waves can result in reduced performance and potentially damage vessel components.

Powerful microwave beams deposited near the location of so-called reversed shear Alfvén eigenmodes (RSAEs) are found to modify the wave activity significantly—in some cases completely removing the modes. Based on experiments run at the DIII-D tokamak, the team has arrived at a simple model that determines how to predictably minimize RSAEs by using microwaves to heat the electrons at particular points in the plasma.

Read the full report here.

-- Spectrograms showing the change in wave activity with and without microwave heating. With no heating (top), upward frequency sweeping RSAEs are observed. With heating near the wave location (bottom), no RSAEs are expected or observed. Adapted from: M.A. Van Zeeland, W.W. Heidbrink , S.E. Sharapov , D. Spong , A. Cappa, et.al., Nucl. Fusion 56, 112007 (2016).

An update on ITER has been published in the Autumn 2017 issue of Energy Focus, the flagship magazine of the UK-based Energy Industries Council.

Titled "Is Fusion the Fuel of the Future?" the article describes recent project performance, concerns about the effect of Brexit, and why it's all worth it.

You can read the article on line at Energy Focus (pp 46-47).

A new National Geographic series on renewable energy, called "Positive Energy," will be featuring the ITER Project in one of its upcoming episodes.

The episode will be viewable on the National Geographic Channel in Europe on Wednesday 1 November at 10:00 p.m. 

It has already been broadcast on the National Geographic Channel in Africa and China (25 October) and in the Americas (18 October).

See more on the "Positive Energy" website.