Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Improving magnetic fusion devices with gyrokinetic simulations of plasma turbulence

22.04.2008
The GYROKINETICS project team further developed the gyrokinetic simulation approach to plasma turbulence, which is expected to help improve the performance of magnetic confinement fusion devices.

Magnetic confinement fusion has the potential to provide a substantial proportion of the world’s energy needs in the 21st century in a safe and environmentally friendly way. Its realisation is, however, hampered by the complex behavior of hot collisionless plasmas (ion gases) in strong magnetic fields. Such plasmas are subject to temperature and density gradient driven microturbulence which leads to particle and heat losses and tends to keep the plasma from reaching a "burning" state.

Simulations are necessary if we are to understand and control plasma microturbulence. However, because fusion plasmas are virtually collisionless, a three-dimensional (i.e., in space) fluid description must, in principle, be abandoned, in favor of a six-dimensional (i.e., in phase space) kinetic one.

Fortunately, several processes on very small spatio-temporal scales – such as the gyrating motion of the particles around magnetic field lines – can be removed, analytically, from the basic equations, thus making the problem five-dimensional. This reduces the computational requirements by many orders of magnitude, without sacrificing accuracy. This approach is called gyrokinetics, which gave the present project its name.

The GYROKINETICS project was carried out in 2006 and 2007 by researchers from the Max Planck Institute for Plasma Physics at Garching, Germany, and the Ecole Polytechnique Fédérale of Lausanne, in Switzerland using DEISA’s resources under the DECI and the JRA3 frameworks.

As a result, the research group were able to show that certain small-scale turbulent processes can make substantial contributions to the overall heat transport carried by the plasma electrons. It turned out, in particular, that there often tends to be a scale separation between ion and electron thermal transport. While the former is usually carried more or less exclusively by long wavelength fluctuations, a substantial proportion of the latter can be carried by much smaller scales.

These findings represent an important new insight into the physics of turbulent transport in magnetized plasmas, and will have important implications for future full-torus simulations of large fusion devices, such as the International Thermonuclear Experimental Reactor ITER.

Kirsti Turtiainen | alfa
Further information:
http://www.deisa.eu/press/GYROKINETICS.pdf

More articles from Physics and Astronomy:

nachricht Applicability of dynamic facilitation theory to binary hard disk systems
08.12.2016 | Nagoya Institute of Technology

nachricht Will Earth still exist 5 billion years from now?
08.12.2016 | KU Leuven

All articles from Physics and Astronomy >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Significantly more productivity in USP lasers

In recent years, lasers with ultrashort pulses (USP) down to the femtosecond range have become established on an industrial scale. They could advance some applications with the much-lauded “cold ablation” – if that meant they would then achieve more throughput. A new generation of process engineering that will address this issue in particular will be discussed at the “4th UKP Workshop – Ultrafast Laser Technology” in April 2017.

Even back in the 1990s, scientists were comparing materials processing with nanosecond, picosecond and femtosesecond pulses. The result was surprising:...

Im Focus: Shape matters when light meets atom

Mapping the interaction of a single atom with a single photon may inform design of quantum devices

Have you ever wondered how you see the world? Vision is about photons of light, which are packets of energy, interacting with the atoms or molecules in what...

Im Focus: Novel silicon etching technique crafts 3-D gradient refractive index micro-optics

A multi-institutional research collaboration has created a novel approach for fabricating three-dimensional micro-optics through the shape-defined formation of porous silicon (PSi), with broad impacts in integrated optoelectronics, imaging, and photovoltaics.

Working with colleagues at Stanford and The Dow Chemical Company, researchers at the University of Illinois at Urbana-Champaign fabricated 3-D birefringent...

Im Focus: Quantum Particles Form Droplets

In experiments with magnetic atoms conducted at extremely low temperatures, scientists have demonstrated a unique phase of matter: The atoms form a new type of quantum liquid or quantum droplet state. These so called quantum droplets may preserve their form in absence of external confinement because of quantum effects. The joint team of experimental physicists from Innsbruck and theoretical physicists from Hannover report on their findings in the journal Physical Review X.

“Our Quantum droplets are in the gas phase but they still drop like a rock,” explains experimental physicist Francesca Ferlaino when talking about the...

Im Focus: MADMAX: Max Planck Institute for Physics takes up axion research

The Max Planck Institute for Physics (MPP) is opening up a new research field. A workshop from November 21 - 22, 2016 will mark the start of activities for an innovative axion experiment. Axions are still only purely hypothetical particles. Their detection could solve two fundamental problems in particle physics: What dark matter consists of and why it has not yet been possible to directly observe a CP violation for the strong interaction.

The “MADMAX” project is the MPP’s commitment to axion research. Axions are so far only a theoretical prediction and are difficult to detect: on the one hand,...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

ICTM Conference 2017: Production technology for turbomachine manufacturing of the future

16.11.2016 | Event News

Innovation Day Laser Technology – Laser Additive Manufacturing

01.11.2016 | Event News

#IC2S2: When Social Science meets Computer Science - GESIS will host the IC2S2 conference 2017

14.10.2016 | Event News

 
Latest News

Closing the carbon loop

08.12.2016 | Life Sciences

Applicability of dynamic facilitation theory to binary hard disk systems

08.12.2016 | Physics and Astronomy

Scientists track chemical and structural evolution of catalytic nanoparticles in 3-D

08.12.2016 | Materials Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>