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Ion Beam Applications Lab
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The lab studies the phenomena that occur when ion beams strike materials and molecules.

AboutAbout the lab
Understanding irradiation phenomena caused by fast ions at the atomic level.
The Ion Beam Applications Lab investigates the complex phenomena that occur when fast ions produced by an accelerator strike a target, starting from the elementary process of atomic collisions.
The lab develops new irradiation effects and detection techniques using ion beams, with the aim of applying them to mass spectrometry, materials analysis, and atomic and molecular reaction experiments.
Experiments use accelerators at the Research Facility Center for Science and Technology at the University of Tsukuba, as well as equipment at the High Energy Accelerator Research Organization (KEK).
The lab's website also introduces it under the name "Tomita Lab."
Key terms
- Molecular ion
- An electrically charged molecule. When accelerated and directed at a target, multiple atoms enter a small region almost simultaneously.
- Electrostatic ion storage ring
- A device that keeps ions circulating using electric fields. An electron beam is merged with the circulating ions to study reactions.
- Superconducting tunnel junction
- A device in which a thin insulator is sandwiched between superconductors. It can directly measure the energy of particles.
ResearchResearch themes
To understand the phenomena caused by fast ions, it is essential to understand molecular reactions, which are their elementary processes. The lab works on irradiation with spatially extended ion beams, the breakup processes of molecules, and particle detection techniques.
*Illustrative imageNonlinear effects of fast cluster irradiation
When molecular ions are accelerated to high speed and directed at a material, multiple atoms can enter a very small region almost simultaneously. The lab aims to discover phenomena that occur under irradiation with spatially extended ion beams, which cannot be produced with single-atom ions, and to clarify the mechanisms behind them.
*Illustrative imageExperiments on molecular breakup processes
Using an electrostatic ion storage ring, the lab studies the process by which protein and DNA molecules break up after capturing electrons. An electron beam is merged with the circulating large molecular ions to measure the breakup rate. This research is carried out jointly with AIST, Kyoto University, and KEK.
*Illustrative imageParticle detection with superconducting tunnel junctions
A superconducting tunnel junction can directly measure the energy of atoms and molecules with kinetic energies of a few keV at 100% detection efficiency. In joint research with the National Institute of Advanced Industrial Science and Technology (AIST), the lab works on improving this device and applying it to molecular reaction experiments and mass spectrometry.
MembersFaculty
The members of the Ion Beam Applications Lab are faculty and undergraduate students.As of 2026
- Associate ProfessorShigeo Tomita
VoicesStudent voices
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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 of Pennsylvania accelerator beam tube 1940” 作者不詳 / Public domain (cropped)
- Nonlinear effects of fast cluster irradiation: “Later stage of the CLARA Accelerator, Daresbury Laboratory” Mystery Ray / CC0 (cropped)
- Experiments on molecular breakup processes: “DNA-fragment-3D-vdW” 作者不詳 / Public domain (cropped)
- Particle detection with superconducting tunnel junctions: “Hero-64-pixel-array-superconducting-nanowire-single-photon-detector-b” NASA/JPL-Caltech; Text by Dr. Warren Holmes / Public domain (cropped)
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- Related lab (光物性理論研究室): “Laser optique” 作者不詳 / Public domain (cropped)
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