<p>A superconductive acceleration pipe (10) having a plurality of mutually welded and connected half-split cells (11) being of a dish shape having a substantially predetermined plate thickness and having larger diameter portions (11b) and smaller diameter portions (11a), formed of superconductive materials and being formed into a tubular shape whose body diameter is periodically changed. The respective half-split cells (11) are welded to one another through connecting members (12) formed of ring-shaped superconductive materials disposed in the small diameter portions (11a). The half-cut cells (11) and the connecting members (12) are made of Nb. <IMAGE></p>
