Recent Experiments At Ndcx-II: Irradiation Of Materials Using Short, Intense Ion Beams
Abstract
We present an overview of the performance of the Neutralized Drift Compression Experiment-II (NDCX-II) accelerator at Berkeley Lab, and summarize recent studies of material properties created with nanosecond and millimeter-scale ion beam pulses. The scientific topics being explored include the dynamics of ion induced damage in materials, materials synthesis far from equilibrium, warm dense matter and intense beam-plasma physics. We summarize the improved accelerator performance, diagnostics and results of beam-induced irradiation of thin samples of, e.g., tin and silicon. Bunches with over 3x10^10 ions, 1- mm radius, and 2-30 ns FWHM duration have been created. To achieve these short pulse durations and mm-scale focal spot radii, the 1.2 MeV He+ ion beam is neutralized in a drift compression section which removes the space charge defocusing effect during final compression and focusing. Quantitative comparison of detailed particle-in-cell simulations with the experiment play an important role in optimizing accelerator performance; these keep pace with the accelerator repetition rate of ~1/minute.
Keywords
Cite
@article{arxiv.1610.05253,
title = {Recent Experiments At Ndcx-II: Irradiation Of Materials Using Short, Intense Ion Beams},
author = {P. A. Seidl and Q. Ji and A. Persaud and E. Feinberg and B. Ludewigt and M. Silverman and A. Sulyman and W. L. Waldron and T. Schenkel and J. J. Barnard and A. Friedman and D. P. Grote and E. P. Gilson and I. D. Kaganovich and A. Stepanov and F. Treffert and M. Zimmer},
journal= {arXiv preprint arXiv:1610.05253},
year = {2016}
}
Comments
Submitted to the 2016 North American Particle Accelerator Conference (NAPAC16). Proceedings to be published at http://jacow.org/