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Plasma Materials Engineering Lab
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The lab uses lasers to make the inside of plasma visible, and also studies hydrogen in fusion reactor materials.
AboutAbout the lab
An era where seeing inside plasma is taken for granted.
The Plasma Materials Engineering Lab studies the control and new applications of plasmas used in industry, as well as the behavior of hydrogen inside fusion reactor materials.
It is hard to grasp the internal state of plasma, and to date plasma has been used largely on the basis of experience.
The lab uses lasers to measure electron density and temperature in plasma, and works on optimizing plasmas such as those used as light sources for semiconductor lithography.
The lab also investigates how much of the hydrogen isotopes that serve as fusion reactor fuel enters materials and how they move within them, and applies the findings to technologies for controlling hydrogen.
Key terms
- Plasma
- A state in which the atoms of a gas are separated into electrons and ions, and electrically charged particles move around freely.
- Thomson scattering
- A method that shines a laser on plasma and analyzes the light scattered by electrons to determine electron density and temperature.
- Hydrogen isotopes
- Forms of hydrogen with different masses. Fusion reactors use deuterium and tritium as fuel.
ResearchResearch themes
Starting from laser-based measurement, the lab studies the control and optimization of plasmas used in industry and their new applications. It also investigates the behavior of hydrogen inside fusion reactor materials and applies the results to technologies for controlling hydrogen.
*Illustrative imageLight-source plasma for semiconductor lithography
The extreme ultraviolet light used in the most advanced semiconductor lithography is emitted by plasma created by irradiating tin with a laser. The lab measures the electron density and electron temperature of the light-source plasma by laser scattering, and searches for conditions under which light is emitted more efficiently.
*Illustrative imageMeasuring electrons in atmospheric-pressure plasma
Atmospheric-pressure plasma, which needs no vacuum chamber, has a growing range of applications such as exhaust gas treatment and sterilization. The lab applies Thomson scattering to discharges that are extremely small and last only a very short time, measuring electron density and electron temperature (including joint research with the University of Tokyo).
*Illustrative imageCreating space conditions in the laboratory with lasers
High-intensity lasers make it possible to reproduce in the laboratory the shock waves that occur in space. In joint research with the Institute of Laser Engineering at Osaka University, the lab measures the density and temperature of plasma near shock waves by collective Thomson scattering.
*Illustrative imageHydrogen in fusion reactor materials
Using devices such as hydrogen ion and plasma irradiation equipment, the lab investigates how much hydrogen isotopes enter fusion reactor materials such as tungsten, how they move, and at what temperature they are released. Based on the findings, the lab also develops new technologies for hydrogen control and hydrogen purification.
MembersFaculty
The members of the Plasma Materials Engineering Lab consist of faculty and students in the doctoral program, master's program, and undergraduate program.As of 2022
- Associate ProfessorKentaro Tomita
- Assistant ProfessorYuji Nobuta
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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: “Plasma generation in air” Rcaravit / CC BY 4.0 (cropped)
- Light-source plasma for semiconductor lithography: “The moment a high-power laser pulse interacts with a target to produce a plasma is captured at the Vulcan PW facility ( )” Science and Technology Facilities Council / CC BY-SA 2.0 (cropped)
- Measuring electrons in atmospheric-pressure plasma: “Filamentous Dielectric Barrier Discharge” Devansh.sharma / CC BY-SA 4.0 (cropped)
- Creating space conditions in the laboratory with lasers: “National Ignition Facility's target chamber” Lawrence Livermore National Security / CC BY-SA 3.0 (cropped)
- Hydrogen in fusion reactor materials: “Tungsten element” W. Oelen / CC BY-SA 3.0 (cropped)
- Related lab (Plasma Environmental Process Lab): “Plasma-lamp 2” Luc Viatour / CC BY-SA 3.0 (cropped)
- Related lab (Plasma Bio-Application Engineering Lab): “LHD plasma vacuum vessel” National Institute for Fusion Science / CC BY-SA 4.0 (cropped)
- Related lab (Intelligent Structural Systems Lab): “Taipei 101 tuned mass damper 06” Johan Jönsson (Julle) / CC BY-SA 4.0 (cropped)
- Related lab (Space Environment Systems Engineering Lab): “Rocket Engine Hot Fire” camelNotation / CC0 (cropped)
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