Abstract: 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 sample 31 is irradiated with laser Compton photon beams 21 and 22 generated by a collision between an electron beam 12 and polarized laser light 16 and 20. 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.

Abstract: 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 sample 31 is irradiated with laser Compton photon beams 21 and 22 generated by a collision between an electron beam 12 and polarized laser light 16 and 20. 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.

Abstract: 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)˜1/(4 Nw) (Nw=the number of undulator periods) of electron beam power or rendered prop

Abstract: In an electron accelerator such as an electron storage ring, a linac or an energy-recovery linac, accelerated electron bunches are subjected to light-electron interaction to have a varying profile of electron density and the thus modulated electron bunches are passed between deflecting magnets or injected into an undulator to generate high-brightness, narrow-band orbital radiation, thereby enabling high-brightness, narrow-band orbital radiation to be utilized simultaneously on a plurality of beam lines.

Abstract: A method of producing synchrotron radiation comprising the steps of accelerating and compressing an electron beam generated from an electron source by means of a pre-accelerator, further accelerating the electron beam in a main accelerator to produce synchrotron radiation on a recirculation orbit, decelerating the electron beam in the main accelerator to recover its energy and discarding it into a beam dump, said pre-accelerator being an energy-recovery pre-accelerator and posited before the main accelerator on said recirculation orbit so that it also performs energy recovery through beam deceleration, thereby reducing the rf power it is supplied with externally for beam acceleration.

Abstract: A method of producing synchrotron radiation comprising the steps of accelerating and compressing an electron beam generated from an electron source by means of a pre-accelerator, further accelerating the electron beam in a main accelerator to produce synchrotron radiation on a recirculation orbit, decelerating the electron beam in the main accelerator to recover its energy and discarding it into a beam dump, said pre-accelerator being an energy-recovery pre-accelerator and posited before the main accelerator on said recirculation orbit so that it also performs energy recovery through beam deceleration, thereby reducing the rf power it is supplied with externally for beam acceleration.

Abstract: 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 super-conducting 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)˜1/(4 Nw) (Nw=the number of undulator periods) of electron beam power or