A proposed near-term experiment for pulse length minimization on NDCX-II

摘要

to 130 keV and compresses the beam with 7 induction cells (accelerating elements). The duration of the ion beam will be shortened from 500 ns to less than 70 ns down the machine. The pulse length of the beam will be largely affected by the compression schedule of each cell in the acceleration section. If the beam is over-compressed, particle overtaking can take place, leading to irreversible growth of the longitudinal emittance, which is a beam parameter that directly relates to the pulse length. Using WARP simulation, the compression schedule has been re-optimized, by maximally compressing the beam without particle overtaking and associated irreversible longitudinal emittance growth. In the present configuration, the beam will drift down to the target after leaving all the acceleration elements. Further reduction of the longitudinal emittance of the beam can lead to additional reduction of the final pulse length on the target. We propose to apply a generalization of a recent technique