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Ejiri-Tsujii Lab
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The lab studies high-temperature plasmas with a spherical tokamak device, aiming for a compact fusion reactor.
AboutAbout the lab
Aiming for a compact fusion reactor with a spherical tokamak
The Ejiri-Tsujii Lab studies the physics of high-temperature plasmas to realize fusion energy.
The lab conducts experiments using a spherical tokamak device called TST-2, located at the Kashiwa Campus.
Its work includes plasma heating and current drive using waves, turbulence and instabilities, and the development of plasma diagnostics.
The lab aims to realize a compact spherical tokamak reactor that anyone can use anywhere.
Key terms
- Plasma
- A state in which, at high temperature, electrons are stripped from atoms and the electrons and ions move around freely and separately.
- Spherical tokamak
- A type of tokamak, a device that confines plasma with magnetic fields, made compact and round overall like an apple.
- Alpha particle
- A helium nucleus produced in a fusion reaction. It is ejected with high energy.
ResearchResearch themes
Using the TST-2 spherical tokamak at the Kashiwa Campus of the University of Tokyo, the lab studies the physical phenomena that occur in fusion plasmas. Through research on heating and current drive with waves, turbulence and instabilities, and the development of diagnostics, it aims to realize a compact fusion reactor.
*Illustrative imageHeating and Current Drive with Waves
High-temperature plasmas support a variety of waves, and under the right conditions the energy of a wave is transferred to electrons and ions, enabling heating and current drive. The lab has shown that a spherical tokamak can be formed using lower hybrid waves and other means, and it is now exploring more efficient current drive methods through experiments.
*Illustrative imageExtremely Low-Density Plasmas
In TST-2, lower hybrid waves can be used to create low-density plasmas with very high electron energy. These electrons, which undergo few collisions, have properties similar to alpha particles in a fusion reactor, so experiments that mimic alpha particles are possible.
*Illustrative imageTurbulence, Transport, and Instabilities
In high-temperature plasmas, instabilities give rise to turbulence, which makes it easier for heat and particles to escape (transport). The lab uses TST-2 to study phenomena that degrade plasma confinement, such as internal reconnection events, which are characteristic of spherical tokamaks.
*Illustrative imageNonlinear, Non-equilibrium Plasmas
High-temperature plasmas are driven far from thermal equilibrium, and instabilities interact with one another nonlinearly, either saturating or causing the plasma to collapse. TST-2, which forms a tokamak by driving current with high-frequency waves alone, produces a highly autonomous plasma.
MembersFaculty
The members of the Ejiri-Tsujii Lab consist of faculty, doctoral and master's students, research students, and visiting collaborative researchers.As of 2026
- ProfessorAkira EjiriPublications ↗
- Associate ProfessorNaoto TsujiiPublications ↗
- Project Assistant ProfessorTakeru InouePublications ↗
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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: “MAST Tokamak ( )” Eye Steel Film / CC BY 2.0 (cropped)
- Heating and Current Drive with Waves: “Alcator C-Mod Tokamak Interior” Mike Garrett / CC BY 3.0 (cropped)
- Extremely Low-Density Plasmas: “MAST plasma image” Culham Centre for Fusion Energy. / CC BY-SA 3.0 (cropped)
- Turbulence, Transport, and Instabilities: “Magnetic turbulence” Giannandrea Inchingolo / CC BY-SA 4.0 (cropped)
- Nonlinear, Non-equilibrium Plasmas: “U.S. Department of Energy - Science - )” U.S. Department of Energy from United States / Public domain (cropped)
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- Related lab (Yamaguchi (Hiro) Lab): “Tycho-supernova-xray” NASA/CXC
（Smithsonian Institution 経由） / Public domain (cropped) - Related lab (Yako Lab (CNS Experimental Nuclear Physics)): “RIKEN Superconducting Ring Cyclotron P4213478” Kestrel / CC BY-SA 4.0 (cropped)
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