부산대학교 도서관

We present an overview of the performance of the Neutralized DriftCompression Experiment-II (NDCX-II) accelerator at Berkeley Lab, and summarizerecent studies of material properties created with nanosecond andmillimeter-scale ion beam pulses. The scientific topics being explored includethe dynamics of ion induced damage in materials, materials synthesis far fromequilibrium, warm dense matter and intense beam-plasma physics. We summarizethe improved accelerator performance, diagnostics and results of beam-inducedirradiation of thin samples of, e.g., tin and silicon. Bunches with over3x10^10 ions, 1- mm radius, and 2-30 ns FWHM duration have been created. Toachieve these short pulse durations and mm-scale focal spot radii, the 1.2 MeVHe+ ion beam is neutralized in a drift compression section which removes thespace charge defocusing effect during final compression and focusing.Quantitative comparison of detailed particle-in-cell simulations with theexperiment play an important role in optimizing accelerator performance; thesekeep pace with the accelerator repetition rate of ~1/minute.