LAB LOGA page on LabLog, a review site (not the lab's official page)
Kumada-Sato-Fujii-Umemoto Lab
Machine-translated · View original
The lab measures and explains high-voltage and discharge phenomena, and applies the findings to the insulation of power equipment.
AboutAbout the lab
Aiming to understand high-voltage and discharge phenomena
The Kumada-Sato-Fujii-Umemoto Lab studies high-voltage and discharge plasma phenomena.
The lab develops methods to measure these phenomena, clarifies their mechanisms, controls them from an engineering standpoint, and explores new uses for them.
It works on insulation technology for the high-voltage, high-current equipment that supports power systems, and on extending that work to smart power equipment.
The lab is jointly run by Professor Kumada, Associate Professor Sato, Project Professor Fujii, and Project Associate Professor Umemoto.
Because Engineering Building No. 13 is being renovated, the lab has temporarily moved to the Ship Motion Performance Testing Tank (as of September 2026).
Key terms
- Discharge plasma
- A state in which current flows through a gas under high voltage, splitting the gas into electrically charged particles and making it glow
- Gas-insulated switchgear
- Power equipment that connects and disconnects power transmission circuits inside a container filled with a gas that conducts electricity poorly
- First-principles calculation
- A method of calculating the behavior of electrons and atoms from the fundamental laws of physics, without relying on experimental values
NewsLab news
A master's student's paper was published in Applied Physics Letters
A graduate's paper summarizing results achieved during their time in the lab was published in IEEE Transactions on Plasma Science
A graduate's paper was published in Optics Letters and selected as an Editor’s Pick
A master's student received the University of Tokyo Outstanding Master's Thesis Award
A master's student received the Young Researcher Excellent Presentation Award at the Joint Technical Meeting on Dielectric and Insulating Materials and on Electric Wires and Cables
ResearchResearch themes
The lab aims to clarify high-voltage, high-electric-field, and discharge phenomena that are not yet understood. Building on its strength in developing measurement methods, it works on elucidating high-field and discharge phenomena, insulation technology for high-voltage, high-current equipment, and extending these to smart power equipment.
*Illustrative imageCharge Accumulating on Insulators Under DC Voltage
When DC voltage is applied to the insulating spacers of gas-insulated switchgear, charge accumulates on their surfaces and makes insulation breakdown more likely. The lab investigates the mechanism of this charging through both experiments and numerical analysis.
*Illustrative imageExploring Charge Motion Inside Insulating Materials Through Computation
To understand how the polymer insulating materials used in high-voltage equipment degrade, the lab evaluates how charge moves inside the materials using first-principles calculations.
*Illustrative imageRemote Measurement with Lasers
The lab studies measurement and diagnostic techniques that make in-situ measurements from a distance. These techniques use laser light to create plasma and analyze its emission spectrum to identify elements (laser-induced breakdown spectroscopy). The lab also covers the fundamentals and applications of the long, thin plasma channels that ultrashort-pulse lasers create in air.
*Illustrative imageHigh-Voltage Insulation Technology for Next-Generation Power
The lab works on developing insulating materials with a low environmental impact, expanding their use in power electronics equipment, and advancing techniques for diagnosing equipment condition.
MembersFaculty
The members of the Kumada-Sato-Fujii-Umemoto Lab consist of faculty, professors emeriti, project senior researchers, academic specialists, secretaries, advisors, doctoral, master's, and undergraduate students, and auditing students.As of 2026
- ProfessorAkiko KumadaPublications ↗
- Associate ProfessorMasahiro SatoPublications ↗
- Project ProfessorTakashi Fujii
- Project Associate ProfessorTakahiro UmemotoPublications ↗
- Project Assistant ProfessorHaoou Ruan
VoicesStudent voices
Compiled from answers by students who were in the lab. Ratings and reviews reflect individual students' experiences, not the lab's official views.
Students who take part in an interview may receive a thank-you gift worth ¥1,000, regardless of what they say.
Who is this lab for?
What's great about this lab?
What did you learn after joining?
What's the vibe, and what is the professor like?
Where do graduates go?
RelatedLabs similar to Kumada-Sato-Fujii-Umemoto Lab
Ono LabFaculty of Engineering, Department of Electrical and Electronic EngineeringLaser diagnostics of the various reactive species central to…
Ono-Inomoto-Tanabe LabFaculty of Engineering, Department of Electrical and Electronic EngineeringPlasma engineering and plasma physics; development of next-g…
Ohya LabFaculty of Engineering, Department of Electrical and Electronic EngineeringSpintronics using spin degrees of freedom in semiconductors …
Matsui LabFaculty of Engineering, Department of Electrical and Electronic EngineeringCreation of biomolecular information sensing, biological def…The information on this page is compiled by the LabLog team from the lab's public information and interviews. For corrections or removal requests, please contact LabLog, not the lab.
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: “Lichtenberg Fractal Figure 01” Timothee Rolland / CC BY-SA 4.0 (cropped)
- Charge Accumulating on Insulators Under DC Voltage: “110kV-SF6-Schaltanlage Umspannwerk Simmering” Wdwd / CC BY-SA 3.0 (cropped)
- Exploring Charge Motion Inside Insulating Materials Through Computation: “Polymer Glass Simulation ( )” National Institute of Standards and Technology / Public domain (cropped)
- Remote Measurement with Lasers: “Table GWMorley” Gavin Morley / CC BY-SA 4.0 (cropped)
- High-Voltage Insulation Technology for Next-Generation Power: “High Voltage Insulators” Larry D. Moore / CC BY 4.0 (cropped)
- Related lab (Ono Lab): “Atmospheric-pressure plasma” Alibabble / CC0 (cropped)
- Related lab (Ono-Inomoto-Tanabe Lab): “MAST Tokamak ( )” Eye Steel Film / CC BY 2.0 (cropped)
- Related lab (Ohya Lab): “Perovskite oxide thin film” Magnunor / CC BY-SA 4.0 (cropped)
- Related lab (Matsui Lab): “Nanoscale Plasmonic Resonator Structures ( )” National Institute of Standards and Technology / Public domain (cropped)
About LabLog
LabLog is a lab review app for students only. Student members at each university interview students in labs and publish what they say. Student voices can only be read by students who sign up with a university email address. Operated by bestiee Inc.
Learn more about LabLog ↗Search engines and AI may reference the basic lab info and rating summaries on this page and the description of LabLog. Student voices are for student members only. Automated collection by programs (scraping, or input to or training of AI) is prohibited under Article 8 of the Terms of Service. If you need data for research or analysis, please contact us.