National Institute of Advanced Industrial Science and Technology

Kyoto University

Japan Atomic Energy Agency

Japan Atomic Energy Research

Ryoichi Hajima

Eisuke Minehara

Hiroyuki Toyokawa

Ryoji Nagai

Nobuhiro Kikuzawa

Toshiyuki Shizuma

Hideaki Ohgaki

Takehito Hayakawa

Nobuyuki Nishimori

Isotope identification imaging of nuclear fuel material or explosives concealed in a drum or container in which nuclear reactor fuel or radioactive waste are sealed is realized while ensuring high precision, high reliability, and safety. A sampleis irradiated with laser Compton photon beamsandgenerated by a collision between an electron beamand polarized laser lightand. An isotope in the sample is identified using nuclear resonance fluorescence, and the spatial distribution thereof is imaged. In so doing, a nuclear level of an isotope whose emission direction of nuclear resonance fluorescence is dependent on the planes of polarization of the incident LCS photon beams is used.

Nondestructive inspection system using nuclear resonance fluorescence

A method for realizing both high extraction efficiency of laser light from electron beams and femto-second ultra-short pulses in a free-electron laser, wherein the peak current of electron pulses from a superconducting or normal conducting linear accelerator serving as a driver for the free-electron laser is adjusted to be greater than a certain lower limit and electron beams are brought into perfect synchronism with light or the time of duration for which the electron pulses are repeated is made longer than the time to saturation of light oscillation (the time during which light is emitted due to the increase of optical output by an amount corresponding to the gain up to the point where the optical output does not increase any more), whereby the oscillation of light is facilitated, wherein the extraction efficiency of laser light from electron beams is increased to exceed the theoretical limit which is expressed by 1/(2 Nw)&#x2dc;1/(4 Nw) (Nw=the number of undulator periods) of electron beam power or rendered proportional to the square of N, or the number of electrons in a micropulse, and wherein ultra-short pulses of the femto-second range are generated.

Method and a device for realizing both high extraction efficiency of laser light from electron beams and femto-second ultra-short in free-electron lasers pulses

Growing community of inventors

Ibaraki, Japan

Ryoichi Hajima