ITER satellite: torus assembly completed

The Satellite Tokamak Program, JT-60SA, is a major modification of the existing JT-60U tokamak at the Naka Fusion Institute in Japan. Designed to support ITER, and to investigate how best to optimize the design and operation of fusion power plants built after ITER, the project is part of the Broader Approach Agreement signed between Japan and Euratom. First Plasma is planned in 2020.

Advanced assembly of the modified tokamak is underway now. The last vacuum vessel sector, pre-assembled with toroidal field coils and thermal shielding, was recently installed to complete the 360-degree torus.

Using electron cyclotron heating to stabilize the plasma

In a recent report in Nuclear Fusion, an international team of researchers outlines an approach for using electron cyclotron heating to control instabilities known as "neoclassical tearing modes" that can cause magnetic islands to grow in, and perturb, the plasma.

Lead physicist Francesca Poli of the Princeton Plasma Physics Laboratory (PPPL) worked with two of her colleagues and researchers from the ITER Organization, the Max Planck Institute for Plasma Physics in Germany, and the Institute of Plasma Physics in Italy, to describe an approach that for the first time simulates the plasma, the magnetic islands and the feedback control from the electron cyclotron waves.

The current from the electron cyclotron waves (see related article in Newsline) has to be matched with the magnetic island. The simulations performed help to determine the maximum misalignment that can be tolerated and under which conditions experiments should be run.