Recent Experiments At Ndcx-II: Irradiation Of Materials Using Short, Intense Ion Beams

Journal Article · Tue Jun 05 04:00:00 EDT 2018 · arXiv.org Repository

OSTI ID:1461167

Seidl, PA; Ji, Q; Persaud, A; Feinberg, E; Ludewigt, B; Silverman, M; Sulyman, A; Waldron, WL; Schenkel, T; Barnard, JJ; Friedman, A; Grote, DP; Gilson, EP; Kaganovich, ID; Stepanov, A; Treffert, F; Zimmer, M

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.

• Research Organization: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)
• DOE Contract Number: AC02-05CH11231
• OSTI ID: 1461167
• Journal Information: arXiv.org Repository, Journal Name: arXiv.org Repository; ISSN 9999-0017
• Publisher: Cornell University
• Country of Publication: United States
• Language: English