Patent ID: 7081723

Claim:
A drift tube accelerator for the acceleration of ion packets in ion beam acceleration systems, comprising: a housing ( 2 ) comprising a longitudinally divided three-part vacuum tank ( 3 ) having: a central unit ( 4 ), a lower half-shell ( 5 ), and an upper half-shell ( 6 ); the central unit ( 4 ) having on its longitudinal axis ( 7 ) of ion beam guidance an inlet orifice ( 8 ) and an outlet orifice ( 9 ) for the ion packets and there being arranged, on its inner wall ( 10 ), longitudinal ribs ( 11 ) located opposite one another and carrying alternately arranged drift tube holders ( 13 ), which in turn hold drift tube units ( 14 ) coaxially with respect to the longitudinal axis ( 7 ) of ion beam guidance, and the central unit ( 4 ) being removably mounted on the lower half-shell ( 5 ) and removably covered by the upper half-shell ( 6 ); the lower half-shell ( 5 ) comprising a structured steel block ( 15 ) having a partly flat inner base ( 16 ), on which vacuum ports ( 18 ) are arranged; and the upper half-shell ( 6 ) comprising a structured steel block ( 19 ), which has a partly flat inner covering surface ( 20 ) having vacuum ports ( 18 ), the vacuum tank ( 3 ) having at least two inner regions ( 24 , 25 ) in which the drift tubes units ( 14 ) are arranged, including a special drift tube, comprising a focusing device ( 17 ) for transverse ion beam focusing and standing on the partly flat inner base ( 16 ) of the structured steel block ( 15 ), being so arranged between each of the regions that it surrounds the longitudinal axis ( 7 ) of the central unit ( 4 ).