A pulsed system capable of delivering up to a few microamps with a mass range 1–100 u, and with pulse width of bursts of ions approximately 1–2 ns is described. Critical design limitations are discussed to show the overall approach to meet a number of experimental requirements. The system consists of a SNICS negative ion source, a low energy buncher which uses the entire tandem electrostatic accelerator as a drift path to produce bunched ion bursts at the targets or linac entry, and high energy choppers. The buncher consists of a single acceleration gap with aligned removable grids. A detailed analysis is presented of the factors limiting the system performance, with the aim to lessen their effect on the ultimate minimum longitudinal phase space of the ion burst.

描述了一种脉冲系统，该系统能够输送质量范围为1–100 u的高达几微安的电流，并且离子猝发的脉冲宽度约为1-2 ns。讨论了关键的设计限制，以显示满足许多实验要求的总体方法。该系统由一个SNICS负离子源，一个低能聚束器和一个高能斩波器组成，该低能聚束器将整个串联静电加速器用作漂移路径，以在目标或直线加速器入口处产生成束的离子爆发。集束器由单个加速间隙和对齐的可移动网格组成。对限制系统性能的因素进行了详细分析，目的是减少它们对离子猝发的最终最小纵向相空间的影响。