Quantum Radiation Energy

Advanced Energy Generation Division Quantum Radiation Energy Research Section

Professor : Hideaki OHGAKI
Associate Professor : Heishun ZEN
Assistant Professor : Yoon Hnin Bo JU
Program-Specific Junior Associate Professor : Jordi CRAVIOTO CABALLERO

Research on Generation and Application of New Quantum Radiations, i.e. Compact MIR Free Electron Laser, Table-Top THz coherent radiation, and Laser-Compton Gamma-ray. International collaboration research on renewable implementation in ASEAN.

http://www.iae.kyoto-u.ac.jp/quantum/index-e.html

Generation and Application of New Quantum Radiation

Generation and application of new quantum radiations from relativistic electron beams have been studied. Free electron laser, which is generated by a high-brightness electron beam from an accelerator, is a tunable laser with high power. We have developed our original mid-infrared FEL system (KU-FEL) with a compact electron accelerator system. In 2008 we succeeded in FEL power saturation at 13.6 μm in wavelength and now the FEL can provide intense laser light in the wavelength region from 3.4 to 26 μm. KU-FEL achieved the world record of the highest FEL extraction efficiency of the normal conducting FEL system. As application researchers, we promote the mode-selective phonon excitation experiment to study wide-gap semiconductors in cooperation with in-house and outside users. Generation and application of Laser-Compton Gamma-ray beam have been studied for the nuclear safeguard and security technology. A table-top THz coherent radiation system has been studied. We also promote international collaboration research on renewable energy implementation in ASEAN as well.

Principle of FEL

Generation of Free Electron Laser (FEL) is based on the microbunching phenomenon driven by a high-brightness electron beam that interacts with an electromagnetic field.

Wavelength Tunability of KU-FEL.

This graph shows the wavelength tunability of KU-FEL. We can freely change the FEL wavelength from 3.4 to 26 μm by changing the electron beam energy from 36 to 20 MeV and the magnetic field strength of the undulator. The spectral width of the FEL is around 1-3 percent in FWHM.

Isotope CT by using Laser-Compton Gamma-ray beam

Isotope mapping by using Laser-Compton Gamma-ray beam generated in collision of electron beam and laser has been developed to apply nuclear safeguard.