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Title: Irradiation of materials with short, intense ion pulses at NDCX-II

Abstract

Here, we present an overview of the performance of the Neutralized Drift Compression Experiment-II (NDCX-II) accelerator at Berkeley Lab, and report on recent target experiments on beam-driven melting and transmission ion energy loss measurements with nanosecond and millimeter-scale ion beam pulses and thin tin foils. Bunches with around 10 11 ions, 1 mm radius, and 2–30 ns full width at half maximum duration have been created with corresponding fluences in the range of 0.1–0.7 J/cm 2. To achieve these short pulse durations and mm-scale focal spot radii, the 1.1 MeV [megaelectronvolt (10 6 eV)] He + ion beam is neutralized in a drift compression section, which removes the space charge defocusing effect during final compression and focusing. The beam space charge and drift compression techniques resemble necessary beam conditions and manipulations in heavy ion inertial fusion accelerators. In conclusion, quantitative comparison of detailed particle-in-cell simulations with the experiment plays an important role in optimizing accelerator performance

Authors:
 [1];  [2];  [1];  [2];  [2];  [2];  [1];  [3];  [1];  [1];  [1];  [1];  [3];  [1];  [4];  [1];  [4];  [1]
  1. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  3. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
  4. TU Darmstadt, Darmstadt (Germany)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)
Contributing Org.:
Work supported by the US DOE under contracts DE-AC0205CH11231 (LBNL), DE-AC52-07NA27344 (LLNL), and DE-AC02-09CH11466 (PPPL). F. Treffert and M. Zimmer thank Professor Markus Roth for stimulating discussions.
OSTI Identifier:
1393897
Alternate Identifier(s):
OSTI ID: 1436629; OSTI ID: 1513148
Report Number(s):
LLNL-JRNL-738688
Journal ID: ISSN 0263-0346; PII: S0263034617000295; TRN: US1800099
Grant/Contract Number:  
AC02-05CH11231; AC52-07NA27344; AC02-09CH11466
Resource Type:
Accepted Manuscript
Journal Name:
Laser and Particle Beams
Additional Journal Information:
Journal Volume: 35; Journal Issue: 02; Journal ID: ISSN 0263-0346
Publisher:
Cambridge University Press
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Fusion energy; Induction accelerator; Materials; Radiation damage; Space; charge

Citation Formats

Seidl, P. A., Barnard, J. J., Feinberg, E., Friedman, A., Gilson, E. P., Grote, D. P., Ji, Q., Kaganovich, I. D., Ludewigt, B., Persaud, A., Sierra, C., Silverman, M., Stepanov, A. D., Sulyman, A., Treffert, F., Waldron, W. L., Zimmer, M., and Schenkel, T. Irradiation of materials with short, intense ion pulses at NDCX-II. United States: N. p., 2017. Web. doi:10.1017/s0263034617000295.
Seidl, P. A., Barnard, J. J., Feinberg, E., Friedman, A., Gilson, E. P., Grote, D. P., Ji, Q., Kaganovich, I. D., Ludewigt, B., Persaud, A., Sierra, C., Silverman, M., Stepanov, A. D., Sulyman, A., Treffert, F., Waldron, W. L., Zimmer, M., & Schenkel, T. Irradiation of materials with short, intense ion pulses at NDCX-II. United States. doi:10.1017/s0263034617000295.
Seidl, P. A., Barnard, J. J., Feinberg, E., Friedman, A., Gilson, E. P., Grote, D. P., Ji, Q., Kaganovich, I. D., Ludewigt, B., Persaud, A., Sierra, C., Silverman, M., Stepanov, A. D., Sulyman, A., Treffert, F., Waldron, W. L., Zimmer, M., and Schenkel, T. Wed . "Irradiation of materials with short, intense ion pulses at NDCX-II". United States. doi:10.1017/s0263034617000295. https://www.osti.gov/servlets/purl/1393897.
@article{osti_1393897,
title = {Irradiation of materials with short, intense ion pulses at NDCX-II},
author = {Seidl, P. A. and Barnard, J. J. and Feinberg, E. and Friedman, A. and Gilson, E. P. and Grote, D. P. and Ji, Q. and Kaganovich, I. D. and Ludewigt, B. and Persaud, A. and Sierra, C. and Silverman, M. and Stepanov, A. D. and Sulyman, A. and Treffert, F. and Waldron, W. L. and Zimmer, M. and Schenkel, T.},
abstractNote = {Here, we present an overview of the performance of the Neutralized Drift Compression Experiment-II (NDCX-II) accelerator at Berkeley Lab, and report on recent target experiments on beam-driven melting and transmission ion energy loss measurements with nanosecond and millimeter-scale ion beam pulses and thin tin foils. Bunches with around 1011 ions, 1 mm radius, and 2–30 ns full width at half maximum duration have been created with corresponding fluences in the range of 0.1–0.7 J/cm2. To achieve these short pulse durations and mm-scale focal spot radii, the 1.1 MeV [megaelectronvolt (106 eV)] He+ ion beam is neutralized in a drift compression section, which removes the space charge defocusing effect during final compression and focusing. The beam space charge and drift compression techniques resemble necessary beam conditions and manipulations in heavy ion inertial fusion accelerators. In conclusion, quantitative comparison of detailed particle-in-cell simulations with the experiment plays an important role in optimizing accelerator performance},
doi = {10.1017/s0263034617000295},
journal = {Laser and Particle Beams},
number = 02,
volume = 35,
place = {United States},
year = {2017},
month = {5}
}

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Figures / Tables:

Figure 1 Figure 1: Warp PIC simulations are initialized with measured acceleration gap waveforms as shown in the example above, for z=1003 mm downstream of the ion source, at the middle of the second compression cell acceleration gap.

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    Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.