(57)< Abstract > In order to convey the beam, the plural acceleration cells which are formed are included, the cell which it adjoins is linked by the connected cell, the aforementioned connected cell is formed in order to decide the ratio of electric field of husband of the acceleration cell which it adjoins, at least one connected cell changes with correct ratio and ratio of negative number and it is possible, the accelerator. This kind of accelerator really, introduces phase change into electric field by bringing the ratio of negative number. The fact that is meant as for this, the beam, encounters to the electric field of opposite in the cell which is continued, is decelerated. As a result, the beam is generated, in the cell of direction before, to relativistic energy the occasion where it accelerates and/or after bundling the beam by relativistic energy, energy is let escape in the cell of direction after, energy of the beam decreases to 100KeV or 300KeV. Energy of this size, whether contrast of bone structure is the x-ray for high diagnosis. Therefore, it can use the accelerator for photographing the portal picture of kilovolt order. Suitable structure concerning the change possible connected cell as stated in PCT/GB99/00187 which for example is application of time before this applicant, vis-a-vis the axis of the beam has the cavity which accommodates rotary unrestricted conductive element the axis of cross direction as a center. Long-cherished desire, furthermore, regards the usage of this kind of accelerator and the operation method of this kind of accelerator.ビームを搬送するように構成された複数の加速セルを含み、隣接したセルは連結セルによってリンクされており、前記連結セルは、隣接した加速セルの夫々の電場の比を決めるように構成されており、少なくとも一つの連結セルは、正の比と負の比との間で切り換え可能である、加速器。このような加速器は、実際には、負の比を持ち込むことによって電場に位相変化を導入する。このことは、ビームが、連続したセルで逆の電場に遭遇し、減速されるということを意味する。その結果、ビームを発生し、前の方のセルで、相対論的なエネルギーまで加速する際及び/又は相対論的なエネルギーでビームを束ねた後、エネルギーを後の方のセルで逃がし、ビームのエネルギーを100KeV乃至300KeV程度まで低下させる。この大きさのエネルギーは、骨構造のコントラストが遙かに高い診断用X線程度である。従って、キロボルトオーダーのポータル画像の撮影に加速器を使用することがで
