New model stretches the limits of fusion torus control

PPPL physicists Raffi Nazikian (left) and Qiming Hu, with a figure from their research. Photo: PPPL/Elle Starkman

Stars contain their plasma with the force of gravity, but here on earth, plasma in fusion tokamaks must be magnetically confined. That confinement is tenuous, because tokamaks are subject to edge localized modes (ELM)—intense bursts of heat and particles that must be controlled to prevent instabilities and damage to the fusion reactor.

Researchers at the Department of Energy’s Princeton Plasma Physics Laboratory (PPPL) and at General Atomics (GA) recently published a paper in Physical Review Letters explaining this tokamak restriction and a potential path to overcome it. They have developed a new model for ELM suppression in the DIII-D National Fusion Facility, which is operated by GA for the DOE. PPPL physicists Qiming Hu and Raffi Nazikian are the lead authors of the paper, which was announced on August 10 by PPPL.

Assembly of ITER begins in Southern France

Those attending the livestreamed July 28 celebration in person (shown here from above) followed recommended social distancing measures.

First-of-a-kind components have been arriving in recent months at the ITER construction site in Cadarache, France, from some of the 35 ITER member countries around the world. The arrival on July 21 of the first sector of the ITER vacuum vessel from South Korea marks the beginning of a four-and-a-half year machine assembly process for the world’s largest tokamak, a magnetic fusion device designed to prove the feasibility of fusion as an energy source.

ITER reaches major construction milestone

The 1,250-ton cryostat base is positioned over the ITER tokamak pit for installation. The base is the heaviest lift of the tokamak assembly. Photo: ITER

ITER, the world’s largest international scientific collaboration, is beginning the assembly of the fusion reactor tokamak that will include 12 essential hardware systems provided by US ITER, which is managed by Oak Ridge National Laboratory. The first major machine element to be installed is the 1,250-ton base of the cryostat, which was placed into the tokamak assembly pit on May 26. ITER is located in southeastern France.

South Korea completes first vacuum vessel section for ITER

ITER vacuum vessel section no. 6, shown here, was completely assembled in April. South Korea is providing four of the nine 40-degree vacuum vessel sections; Europe is providing the other five. Photo: ITER

South Korea’s Hyundai Heavy Industries (HHI) has completed work on the first vacuum vessel section for the International Thermonuclear Experimental Reactor (ITER), the ITER Organization reported on April 28. The 440-ton section is now being prepared for shipping this summer to the ITER construction site, located near Saint-Paul-lez-Durance, France.

Jacobs wins $25 million in ITER, UKAEA contracts

Jacobs has been awarded several contracts to support work on the ITER fusion project. Photo: ITER Organization

The global engineering company Jacobs announced on April 14 that it has been awarded several contracts with an estimated combined value of more than $25 million. The contracts are with the ITER Organization, Fusion for Energy, and the United Kingdom Atomic Energy Authority (UKAEA) and are intended to support fusion energy projects in France and the United Kingdom.