Forming a uniform distribution of heavy ions on a moving target

Abstract

A way to obtain a uniform distribution of a heavy-ion beam on a moving target by scanning the beam over the target surface is considered. The scanning is performed by the horizontal and vertical scanner. A method is proposed for calculating the particle density distribution on the target with allowance for the influence of the horizontal slit in front of the target. Since the scanner forces deflecting the center of mass of the beam are periodic, the ion density distribution on the target is also a periodic function in the target motion direction and the spatial period of the function depends on the ratio of the scanner frequencies. With the high-frequency vertical scanner, a rather uniform particle density is obtained on the target despite considerable ion density inhomogeneities in the beam. With the slit, the particle density inhomogeneity on the target sharply increases when the scanned beam goes beyond the slit height.