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Kajita Lab
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A lab that studies how plasma interacts with the materials of fusion reactors, with the aim of realizing nuclear fusion.
AboutAbout the lab
Plasma research aimed at solving the energy problem
The Kajita Lab studies plasma with the aim of realizing nuclear fusion.
Through experiments, the lab investigates how the plasma inside a fusion reactor acts on the materials of the reactor wall.
The lab also works on developing methods for measuring plasma temperature and density.
Applied research using metals and metal oxides whose surfaces have been processed with plasma is another of the lab's themes.
Key terms
- Nuclear fusion
- A reaction in which light atomic nuclei combine to form a heavier nucleus. A large amount of energy is released in the process.
- Plasma
- A state in which a gas is heated to an even higher temperature, so that its atoms separate into electrons and ions.
- Neural network
- A computational system modeled on the connections between neurons in the brain. It learns features from many examples.
NewsLab news
Assistant Professor Hayashi receives the Yoshikawa Memorial Fusion Energy Encouragement Award
Paper published on using helium and silicon films in lithium-ion batteries
Assistant Professor Hayashi receives the Academic Encouragement Award of the Japan Society of Plasma Science and Nuclear Fusion Research
A lab member receives the Young Researcher Outstanding Presentation Award at the Fusion Energy Joint Conference
ResearchResearch themes
Aiming at the realization of nuclear fusion, the lab studies the interaction between plasma and the wall materials of fusion reactors, as well as methods for measuring plasma. It also pursues applied research using metals and metal oxides whose surfaces have been processed with plasma.
*Illustrative imageReproducing pulsed plasma in fusion reactors
High-energy plasma occasionally strikes the walls of a fusion reactor. The lab reproduces this by momentarily raising the discharge power, and investigates phenomena predicted to occur in actual reactors.
*Illustrative imageDeveloping plasma sources
The lab develops devices that continuously generate high-density plasma like that striking the walls of a fusion reactor. These devices form the foundation for research on reducing heat load and for materials research.
*Illustrative imagePlasma diagnostics using deep learning
The lab has developed a measurement method in which a neural network learns the relationship between the light emitted by plasma and its temperature and density.
*Illustrative imageNanomaterials made with plasma
When plasma is applied to a metal, a fine, fuzz-like structure forms on its surface. Using this, the lab develops materials such as electrode materials that split water with sunlight to produce hydrogen and oxygen.
MembersFaculty
The members of the Kajita Lab consist of faculty, postdoctoral researchers, doctoral, master's, and undergraduate students, and secretaries.As of 2026
- ProfessorShin KajitaPublications ↗
- Associate ProfessorSaitoh HaruhikoPublications ↗
- Assistant ProfessorYuki HayashiPublications ↗
- Assistant ProfessorShi QuanPublications ↗
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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 plasma image” Culham Centre for Fusion Energy / CC BY-SA 3.0 (cropped)
- Reproducing pulsed plasma in fusion reactors: “Prague asterix laser system-capacitor bank” FDominec / CC BY-SA 4.0 (cropped)
- Developing plasma sources: “AWAKE helicon plasma cell” Ordan, Julien Marius / CC BY 4.0 (cropped)
- Plasma diagnostics using deep learning: “2 (He I) NIST ASD emission spectrum” NIST Atomic Spectra Database (Kramida, A., Ralchenko, Yu., Reader, J., and NIST ASD Team) / Public domain (cropped)
- Nanomaterials made with plasma: “Snowflake on tungsten fuzz” Dmitry Sinelnikov, Dogyun Hwangbo, Shin Kajita / CC BY-SA 4.0 (cropped)
- Related lab (Abe Lab): “Tokamak WEST” Christophe Roux / IRFM / CC BY 4.0 (cropped)
- Related lab (Demachi Lab): “Cooling towers of a nuclear power plant” Vsatinet / CC BY-SA 4.0 (cropped)
- Related lab (Murakami Lab): “Chooz Nuclear Power Plant-9362” Raimond Spekking / CC BY-SA 4.0 (cropped)
- Related lab (Takata Lab): “Sequoyah Nuclear Power Plant cooling towers” Eric Evenson, USGS / Public domain (cropped)
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