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Oishi-Takahashi Lab
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A plasma lab that uses experiments to uncover what happens at the edge of fusion reactors.
AboutAbout the lab
Investigating the plasma at the edge of fusion reactors.
The Oishi-Takahashi Lab studies plasma in the divertor region of fusion reactors.
In magnetic confinement fusion reactors, methods for controlling and predicting the flow of heat leaking from the reactor core are regarded as a key challenge.
The lab uses DT-ALPHA, a linear plasma device, to simulate the divertor region of a reactor and investigates the atomic and molecular processes that take place there.
It tackles the problem through both experiments and simulations, and hopes to develop its results further through joint research with institutions in Japan and abroad.
Key terms
- Plasma
- A state in which gas is given still more energy and electrons and ions move around separately. The Sun, lightning, and fluorescent lamps are also plasma
- Divertor
- In a fusion reactor, a mechanism that receives plasma leaking from the core and exhausts impurities out of the reactor
- Volume recombination
- A process in which, in low-temperature plasma, electrons and ions combine and return to electrically neutral atoms
NewsLab news
A researcher's paper was published in Nuclear Fusion
Associate Professor Oishi's paper was published in Nuclear Fusion
A doctoral student received the Outstanding Student Presentation Award at the Physical Society of Japan 2026 Spring Meeting
An undergraduate student received the Tohoku University President's Award
ResearchResearch themes
Inside a fusion reactor, plasmas across a wide range of temperatures coexist, from core plasma exceeding 100 million °C to edge plasma of about 10,000 °C. The lab targets plasma in the divertor region, working to elucidate the complex atomic and molecular processes that take place there and to develop advanced divertors.
*Illustrative imageHeat flux control with a detached divertor
A heat flux control method called the detached divertor, which neutralizes and isolates the plasma in front of the divertor plate, has been proposed. The lab conducts experiments aimed at improving its performance on DT-ALPHA, a divertor plasma simulator.
*Illustrative imageVolume recombination plasma experiments
Secondary gas is supplied in the downstream part of the device, and its interaction with the plasma induces volume recombination. Volume recombination requires plasma with high electron density and low temperature, which the lab confirms from emission spectra.
*Illustrative imageMeasurement techniques for divertor plasma
To understand plasma behavior, physical quantities must be measured accurately. In addition to developing measurement techniques for low-temperature plasma and high-energy ion beams, the lab carries out measurements using probes, spectrometers, and magnetic probes.
*Illustrative imageNeutral beam injection heating
DT-ALPHA has an ion source at its upstream end that can inject high-energy ion beams. Taking advantage of this feature, the lab also conducts research aimed at making neutral beam injection heating more efficient.
MembersFaculty
The members of the Oishi-Takahashi Lab consist of faculty members and doctoral, master's, and undergraduate students.As of 2026
- Associate ProfessorTetsutaro Oishi
- LecturerHiroyuki Takahashi
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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: “U.S. Department of Energy - Science - )” U.S. Department of Energy from United States / Public domain (cropped)
- Heat flux control with a detached divertor: “BPP LP divertor field 2017 new” Mgr. Jiri Adamek Ph.D., IPP ASCR / CC BY-SA 4.0 (cropped)
- Volume recombination plasma experiments: “Coils of the "Ministellarator" experiment at IPP Greifswald” Siarhei V / CC BY-SA 4.0 (cropped)
- Measurement techniques for divertor plasma: “Libs Laser-induced breakdown spectroscopy” US Army Research Laboratory / Public domain (cropped)
- Neutral beam injection heating: “Particle accelerator DSC09089” David Monniaux / CC BY-SA 3.0 (cropped)
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（伊藤(悟)・江原・宍戸研究室） ): “U.S. Department of Energy - Science - )” U.S. Department of Energy from United States / Public domain (cropped) - Related lab (内一・
LESMANA 研究室): “Nondestructive testing Prommashkomplekt” Balashka at Russian Wikipedia / CC0 (cropped) - Related lab (信頼性計測学分野
（遊佐・吉岡研究室） ): “Olympus EPOCH 600” Boevaya mashina / CC BY-SA 4.0 (cropped) - Related lab (徳増 研究室): “Wikimedia Foundation Servers-8055 13” Victorgrigas / CC BY-SA 3.0 (cropped)
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