Patent ID: 7190764

Claim:
A fixed-field alternating gradient electron accelerator comprising: a vacuum container; an alternating gradient electric magnet provided inside or outside of said vacuum container; an electron beam inputting part to input electron beam into said vacuum container; an accelerating apparatus to accelerate said electron beam; and an electron beam transporting part to transport the accelerated electron beam from said vacuum container, characterized in that said alternating gradient electric magnet forms a closed magnetic circuit consisting of a converging electric magnet and a diverging electric magnet provided on both sides of said converging electric magnet, or an alternating gradient electric magnet forms a closed magnetic circuit consisting of a converging electric magnet and a diverging part provided on both sides of said converging electric magnet, the coil part of the electric magnet making up the alternating gradient electric magnet has a divided coil structure, the respective currents of divided coil parts change the magnetic field coefficient k so that the respective currents of divided coil parts makes the magnetic field distribution in the diameter direction of a vacuum container B=B 0 (r/r 0 ) k (where B 0 is the magnetic field intensity on an input orbital, r 0 is an input orbital radius, and k is a magnetic field coefficient.), and control the zero chromatic aberration shape about the accelerated electron beam, the electron beam intensity and energy, an internal target to generate X-ray is provided inside the vacuum container right before said electron beam transporting part, and said accelerated electron beam and said X-ray can be selectively output.