Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Scientists Move Step Closer to Solving Fusion Plasma Dilemma

16.09.2016

A team of researchers affiliated with Ulsan National Institute of Science and Technology (UNIST), South Korea, claims to have made yet another step towards finding a solution to one of the critical but unsolved fusion plasma physics problems.

The energy bursts caused by the ELMs would be a detrimental event, as it can potentially damage the internal components of the fusion plasma devices like ITER. Therefore, the fundamental understanding of the ELMs and comprehensive physics of the role of magnetic perturbation (MP) as a promising suppression technique have been debated for a long time in fusion community.


The figure above shows ELM structure in the ELM-crash-suppression phase. Black lines in the ECE image are the reconstructed flux surfaces and the red lines are the separatrix position.

The research results achieved by the Fusion Plasma Research Center at UNIST and led by Prof. Hyeon Park in collaboration with Prof. Gunsu Yun at POSTECH was published in the August issue of the prestigious journal, Physical Review Letters.

Through the study, the research team has discovered underlying physics of the suppression mechanism, in which the swirling turbulent flow driven by MP may prevent the ELM crashes in fusion plasmas.

Dr. Jaehyun Lee (UNIST Fusion Plasma Research Center), the first author of the paper has demonstrated that the ELM is weakened by losing energy through interaction with the turbulence induced by MP for the first time. The analysis confirmed coexistence of the ELM and turbulence induced by MP in the ELM-crash suppression phase. The dispersion relation of the turbulence together with spatial structure were directly measured and the nonlinear interaction between the ELM and turbulence was explicitly demonstrated.

This research result was possible by the 3D electron cyclotron emission imaging (ECEI) system, pioneered by Prof. Park a decade ago. The most advanced ECEI system has been developed for KSTAR while he was at POSTECH and currently maintained by the UNIST Fusion Plasma Research Center together with the POSTECH team.

Prof. Park says, “This research result will be a corner-stone for the predictable modeling of the suppression of mechanism of the ELM-crash which will be beneficial for the international project like ITER.” He adds, “Also, such an innovative new research result will position the KSTAR as a leading physics research device in the worldwide fusion community.”

This research was supported by National R&D Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT and Future Planning.

Journal Reference
Jaehyun Lee, Gunsu S. Yun, Minjun J. Choi, Jae-Min Kwon, Young-Mu Jeon, Woochang Lee, Neville C. Luhmann, Jr., and Hyeon K. Park, “Nonlinear interaction of edge-localized modes and turbulent eddies in toroidal plasma under n=1 magnetic perturbation,” Phys. Rev. Lett., 117, 075001 (2016).

Associated links

Funding information

This research was supported by National R&D Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT and Future Planning.

UNIST Public Relations Team | Research SEA
Further information:
http://www.researchsea.com

Further reports about: ECEI Fusion Plasma Research Fusion plasma ICT ITER Plasma UNIST perturbation physics turbulent

More articles from Physics and Astronomy:

nachricht CCNY physicists master unexplored electron property
26.07.2017 | City College of New York

nachricht Large, distant comets more common than previously thought
26.07.2017 | University of Maryland

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: Carbon Nanotubes Turn Electrical Current into Light-emitting Quasi-particles

Strong light-matter coupling in these semiconducting tubes may hold the key to electrically pumped lasers

Light-matter quasi-particles can be generated electrically in semiconducting carbon nanotubes. Material scientists and physicists from Heidelberg University...

Im Focus: Flexible proximity sensor creates smart surfaces

Fraunhofer IPA has developed a proximity sensor made from silicone and carbon nanotubes (CNT) which detects objects and determines their position. The materials and printing process used mean that the sensor is extremely flexible, economical and can be used for large surfaces. Industry and research partners can use and further develop this innovation straight away.

At first glance, the proximity sensor appears to be nothing special: a thin, elastic layer of silicone onto which black square surfaces are printed, but these...

Im Focus: 3-D scanning with water

3-D shape acquisition using water displacement as the shape sensor for the reconstruction of complex objects

A global team of computer scientists and engineers have developed an innovative technique that more completely reconstructs challenging 3D objects. An ancient...

Im Focus: Manipulating Electron Spins Without Loss of Information

Physicists have developed a new technique that uses electrical voltages to control the electron spin on a chip. The newly-developed method provides protection from spin decay, meaning that the contained information can be maintained and transmitted over comparatively large distances, as has been demonstrated by a team from the University of Basel’s Department of Physics and the Swiss Nanoscience Institute. The results have been published in Physical Review X.

For several years, researchers have been trying to use the spin of an electron to store and transmit information. The spin of each electron is always coupled...

Im Focus: The proton precisely weighted

What is the mass of a proton? Scientists from Germany and Japan successfully did an important step towards the most exact knowledge of this fundamental constant. By means of precision measurements on a single proton, they could improve the precision by a factor of three and also correct the existing value.

To determine the mass of a single proton still more accurate – a group of physicists led by Klaus Blaum and Sven Sturm of the Max Planck Institute for Nuclear...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Clash of Realities 2017: Registration now open. International Conference at TH Köln

26.07.2017 | Event News

Closing the Sustainability Circle: Protection of Food with Biobased Materials

21.07.2017 | Event News

»We are bringing Additive Manufacturing to SMEs«

19.07.2017 | Event News

 
Latest News

CCNY physicists master unexplored electron property

26.07.2017 | Physics and Astronomy

Molecular microscopy illuminates molecular motor motion

26.07.2017 | Life Sciences

Large-Mouthed Fish Was Top Predator After Mass Extinction

26.07.2017 | Earth Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>