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Complexity Science Theory (ΣT) Lab
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The lab explores the complex behavior of plasmas through simulation.
AboutAbout the lab
Studying complexity through theory and simulation
The Complexity Science Theory Lab studies the science of complexity hidden in nature from a variety of perspectives, with plasma as its main subject.
Plasma is the fourth state of matter, reached at extremely high temperatures, in which atomic nuclei and electrons fly about at high speed and behave in complex ways unlike ordinary matter.
To study complexity, which is hard to elucidate by experiment or theory alone, the lab uses computer simulation, the third approach after experiment and theory.
The lab is located at the National Institute for Fusion Science in Toki, Gifu Prefecture, and also has office space on the Higashiyama Campus.
Key terms
- Plasma
- The fourth state of matter, reached at extremely high temperatures, in which atomic nuclei and electrons separate and fly about at high speed
- Magnetic confinement fusion
- A method of causing fusion reactions by using powerful coils to create a doughnut-shaped magnetic field and confining high-temperature plasma within it
- Turbulent transport
- The leakage of plasma to the outside caused by vortices of various sizes (turbulence) that form inside the plasma
ResearchResearch themes
The Complexity Science Theory Lab studies the science of complexity hidden in nature from a variety of perspectives, with plasma as its main subject. It investigates turbulence in magnetically confined fusion plasmas and other phenomena through large-scale simulations on supercomputers.
*Illustrative imageMagnetic Confinement Fusion
Powerful coils create a doughnut-shaped magnetic field that confines high-temperature plasma. The aim is to realize on Earth the fusion reactions that power the Sun, and thereby solve the energy problem with an inexhaustible energy source.
*Illustrative imageHigh-Temperature Plasma Turbulence
In high-temperature plasma, instabilities that amplify small fluctuations create vortices of various sizes, leading to a turbulent state. The lab takes on the challenge of evaluating, through large-scale simulations, how much plasma leaks outward.
*Illustrative imagePhysical Modeling of Plasma Turbulent Transport
Turbulence simulations are so computationally demanding that they use most of a supercomputer system for hundreds of hours. The lab therefore builds physical models that can reproduce turbulent transport, based on the enormous amount of data it has accumulated.
*Illustrative imageHigh-Performance Computing
To get the most out of computer performance, the lab studies computer architectures and the latest coding techniques, and develops simulation programs on supercomputers in Japan and abroad.
MembersFaculty
The members of the Complexity Science Theory Lab consist of faculty members, master's students, and research collaborators.
- ProfessorMasanori Nunami
VoicesStudent voices
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “Experimental hall of the Wendelstein 7-X stellarator at IPP Greifswald 03” Siarhei Besarab / CC BY-SA 4.0 (cropped)
- Magnetic Confinement Fusion: “Openstax college-physics 22.26b tokamak-schematic” OpenStax / CC BY 4.0 (cropped)
- High-Temperature Plasma Turbulence: “Magnetic turbulence” Giannandrea Inchingolo / CC BY-SA 4.0 (cropped)
- Physical Modeling of Plasma Turbulent Transport: “Rayleigh-Taylor instability” Lawrence Livermore National Laboratory / Public domain (cropped)
- High-Performance Computing: “Oak Ridge - Kraken (Cray XT5)” Daderot / Public domain (cropped)
- Related lab (プラズマ理論 (P)): “Cross-section of the Wendelstein 7-X plasma vessel” Siarhei Besarab / CC BY-SA 4.0 (cropped)
- Related lab (複雑性科学実験 (ΣE)): “Experimental hall of the Wendelstein 7-X stellarator at IPP Greifswald 04” Siarhei Besarab / CC BY-SA 4.0 (cropped)
- Related lab (宇宙論 (C)): “Hubble reveals galactic drama -image 5- (heic0406h)” NASA, ESA, and S. Beckwith (STScI) and the HUDF Team / Public domain (cropped)
- Related lab (太陽圏プラズマ物理学 (SW)): “Antenna array of URAN-2 radio teelscope” YeS (Serge Yerin) / CC BY-SA 4.0 (cropped)
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