Towards pump-probe experiments of defect dynamics beam pulses

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS

卷:315

Article

Schenkel, T.¹  Lidia, S. M.¹  Weis, C. D.¹  Waldron, W. L.¹  Schwartz, J.¹  Minor, A. M.^2,3  Hosemann, P.^2,4  Kwan, J. W.¹ 

[1] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Accelerator & Fus Res Div, Berkeley, CA 94720 USA

[2] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Div Mat Sci, Berkeley, CA 94720 USA

[3] Univ Calif Berkeley, Dept Mat Sci & Engn, Berkeley, CA 94720 USA

[4] Univ Calif Berkeley, Dept Nucl Engn, Berkeley, CA 94720 USA

关键词: Pulsed ion beams;    Pump-probe;    Point defects;    Ion implantation;    Semiconductors;   

DOI  :  10.1016/j.nimb.2013.05.074

来源: Elsevier

【 摘 要 】

A novel, induction type linear accelerator, the Neutralized Drift Compression eXperiment (NDCX-II), is currently being commissioned at Berkeley Lab. This accelerator is designed to deliver intense (up to 3 x 10(11) ions/pulse), 0.6 to similar to 600 ns duration pulses of 0.05-1.2 MeV lithium ions at a rate of about 2 pulses per minute onto 1-10 mm scale target areas. When focused to mm-diameter spots, the beam is predicted to volumetrically heat micrometer thick foils to temperatures of similar to 30,000 degrees K. At lower beam power densities, the short excitation pulse with tunable intensity and time profile enables pump-probe type studies of defect dynamics in a broad range of materials. We briefly describe the accelerator concept and design, present results from beam pulse shaping experiments and discuss examples of pump-probe type studies of defect dynamics following irradiation of materials with intense, short ion beam pulses from NDCX-II. (C) 2013 Elsevier B.V. All rights reserved.

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