Abstract: A standing-wave linear accelerator structure has an electron gun; a first cavity axially adjacent to the electron gun, into which electrons are injected directly from the electrode gun; a pancake cavity disposed adjacent to the electron gun on a side of the first cavity opposite the electron gun; and a plurality of accelerating cavities including both on-axis cavities and side-coupled cavities, disposed serially after the at least one pancake cavity, to accelerate electrons injected from the electron gun through a central aperture formed in each of the on-axis cavities. The first cavity and the pancake cavity together form a buncher cavity. The accelerator structure omits the prebuncher and buncher cavities while retaining their functions.

Abstract: A standing-wave linear accelerator structure has an electron gun; a first cavity axially adjacent to the electron gun, into which electrons are injected directly from the electrode gun; a pancake cavity disposed adjacent to the electron gun on a side of the first cavity opposite the electron gun; and a plurality of accelerating cavities including both on-axis cavities and side-coupled cavities, disposed serially after the at least one pancake cavity, to accelerate electrons injected from the electron gun through a central aperture formed in each of the on-axis cavities. The first cavity and the pancake cavity together form a buncher cavity. The accelerator structure omits the prebuncher and buncher cavities while retaining their functions.

Abstract: An electron beam corresponding to radiation intensity data is output from an electron source by supplying high energy pulses p-1 through p-n, which correspond to the radiation intensity data of a radiation field, to the electron source from a power source 108. This electron beam is deflected so as to be incident in parallel to the medial axis of a plurality of X-ray target tubes 104-1 through 104-n by a deflection means comprising electromagnets, such that X-ray beams x-1 through x-n, which are produced when the electron beam collides with an inner wall of an X-ray target tube are irradiated with a desired intensity.

Abstract: The electron beam corresponding to radiation intensity data 112 is output from an electron source 103 by supplying high energy pulse p-1 through p-n corresponding to the radiation intensity data 112 of the radiation field to electron source 103 from power source 108. This electron beam is deflected to be incident in parallel to the medial axis of the X-ray target tube by a deflection means comprising electromagnets, X-ray beam x-1 through x-n which electron beam collides to the inner wall of X-ray target tube 104-1 through 104-n, and have desired intensity is irradiated.