Kan-Ene Topics! 環エネTOPICS!


Koichi KAN

Position:      Professor
Degree:       Doctor of Engineering
Laboratory: Quantum Beam Material Process Engineering

Study on generation of ultrashort electron beam and terahertz pulse

Short electron bunches (pulses) with durations of picoseconds to femtoseconds are key elements for the development of time-resolved pump–probe experiments involving the application of pulse radiolysis to improve time resolution. From the viewpoints of beam diagnostics and the generation of probe sources based on electrodynamics, a terahertz spectroscopy of electromagnetic waves emitted from pulsed electron beams has been conducted using a Michelson interferometer and photoconductive antenna. Femtosecond and picosecond electron beams have been generated via a photocathode radio-frequency gun linear-electron-accelerator. Recently, an electron beam with a bunch length of <20 fs was generated and diagnosed successfully. The generation of shorter electron beams with a duration of attoseconds has also been investigated to improve the time resolution of pulse radiolysis.


  1. K. Kan et al., Appl. Phys. Lett. 102, 221118 (2013).
  2. I. Nozawa et al., Phys. Rev. ST Accel. Beams 17, 072803 (2014).
  3. K. Kan et al., Electron. Comm. Jpn. 99, 22-31 (2016).