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Hasegawa Lab
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The lab explores fusion energy using quantum beams and plasma.
AboutAbout the lab
From plasma and quantum beams to fusion energy
The Hasegawa Lab, drawing on plasma science and engineering and quantum beam science and engineering, conducts research ranging from fusion energy to radiation medicine.
It develops accelerators for fusion energy development and high-brightness laser ion sources for next-generation heavy-ion cancer therapy systems.
It also works on developing compact fusion neutron sources for non-destructive testing.
Students themselves assemble and improve precision experimental apparatus, and develop technology while understanding the physics through numerical simulation.
Key terms
- Plasma
- A state in which the atoms of a gas are separated into electrons and ions that move about freely. It is found in the Sun and inside fluorescent lamps
- Nuclear fusion
- A reaction in which light atomic nuclei collide and merge into a heavier nucleus, releasing a large amount of energy
- Laser ablation
- Hitting a solid with an intense laser to strip away its surface and turn it into vapor or plasma
NewsLab news
Demonstrated continuous beam acceleration in a circular accelerator by DC induction acceleration, a world first
A master's student won the Excellence Award in the Nuclear Engineering Course Outstanding Graduating Student Awards
A master's student received the Excellent Paper Presentation Award from the Institute of Electrical Engineers of Japan
Information on lab tours for undergraduates and prospective graduate students has been posted
Several students received Poster Awards at the international conference GXI-ZES
ResearchResearch themes
Using plasma, quantum beams, fusion, and accelerators as keywords, the lab pursues research on fusion energy and applications of quantum beams. Its work includes controlling laser-produced plasma, generating cluster beams, and developing compact fusion neutron sources.
*Illustrative imageLaser Plasma and Ion Acceleration
The lab develops technology that uses a magnetic field to control dense plasma produced directly from a solid by a laser, and extracts high-flux ions at high brightness. It aims at applications to ion sources for driver accelerators for heavy-ion inertial fusion and to ion thrusters for space probes.
*Illustrative imageGenerating Cluster Beams
The lab develops a method to efficiently produce beams of clusters, which are aggregates of atoms, by rapidly cooling vapor generated by laser ablation with helium gas. Applications are expected in new ion implantation technology and in energy drivers for inertial confinement fusion.
*Illustrative imageCompact Fusion Neutron Sources
The lab develops small neutron sources in which deuterium ions produced by an electrical discharge are electrostatically accelerated and collided, releasing neutrons through fusion. They are expected to be used in a wide range of fields, such as explosives detection, structural health assessment of tunnels and bridges, and neutron capture therapy.
*Illustrative imageHigh-Energy Cluster Beams
Fullerene (C60) molecules are large and are easily turned into ions with many electrons stripped away, which makes them well suited to high-energy acceleration. To supply accelerators with large amounts of highly ionized fullerene beams, the lab develops an ion source that uses electron beam irradiation.
MembersFaculty
The Hasegawa Lab's members include faculty, researchers, technical support staff, and doctoral, master's, and undergraduate students.As of 2026
- Associate ProfessorJun HasegawaPublications ↗
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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: “Inertial Electrostatic Plasma Confinement escaping plasma forms a jet of ions” Sigma357 / CC BY 4.0 (cropped)
- Laser Plasma and Ion Acceleration: “Ion source at used in the Cockcroft-Walton accelerators at Fermilab” Z22 / CC BY-SA 4.0 (cropped)
- Generating Cluster Beams: “"End Of The Silicon Age" - Silicon dioxide nanoparticles” Лангин Сергей Сергеевич / CC BY-SA 3.0 (cropped)
- Compact Fusion Neutron Sources: “Nuclear Fusion Reactor ( )” Steve Jurvetson from Los Altos, USA / CC BY 2.0 (cropped)
- High-Energy Cluster Beams: “C60-Fulleren-kristallin” Jochen Gschnaller / CC BY-SA 3.0 (cropped)
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