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Title: NDCX-II target experiments and simulations

Abstract

The ion accelerator NDCX-II is undergoing commissioning at Lawrence Berkeley National Laboratory (LBNL). Its principal mission is to explore ion-driven High Energy Density Physics (HEDP) relevant to Inertial Fusion Energy (IFE) especially in the Warm Dense Matter (WDM) regime. We have carried out hydrodynamic simulations of beam-heated targets for parameters expected for the initial configuration of NDCX-II. For metal foils of order one micron thick (thin targets), the beam is predicted to heat the target in a timescale comparable to the hydrodynamic expansion time for experiments that infer material properties from measurements of the resulting rarefaction wave. We have also carried out hydrodynamic simulations of beam heating of metallic foam targets several tens of microns thick (thick targets) in which the ion range is shorter than the areal density of the material. In this case shock waves will form and we derive simple scaling laws for the efficiency of conversion of ion energy into kinetic energy of fluid flow. Geometries with a tamping layer may also be used to study the merging of a tamper shock with the end-of-range shock. As a result, this process can occur in tamped, direct drive IFE targets.

Authors:
 [1];  [2];  [1];  [1];  [3];  [3];  [3];  [4];  [3];  [3];  [3];  [5];  [3]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  4. Univ. of British Columbia, Vancouver, BC (Canada)
  5. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1245720
Report Number(s):
LLNL-JRNL-604992
Journal ID: ISSN 0168-9002
Grant/Contract Number:  
AC52-07NA27344
Resource Type:
Accepted Manuscript
Journal Name:
Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment
Additional Journal Information:
Journal Volume: 733; Journal Issue: C; Journal ID: ISSN 0168-9002
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION

Citation Formats

Barnard, J. J., More, R. M., Terry, M., Friedman, A., Henestroza, E., Koniges, A., Kwan, J. W., Ng, A., Ni, P. A., Liu, W., Logan, B. G., Startsev, E., and Yuen, A. NDCX-II target experiments and simulations. United States: N. p., 2013. Web. doi:10.1016/j.nima.2013.05.096.
Barnard, J. J., More, R. M., Terry, M., Friedman, A., Henestroza, E., Koniges, A., Kwan, J. W., Ng, A., Ni, P. A., Liu, W., Logan, B. G., Startsev, E., & Yuen, A. NDCX-II target experiments and simulations. United States. doi:10.1016/j.nima.2013.05.096.
Barnard, J. J., More, R. M., Terry, M., Friedman, A., Henestroza, E., Koniges, A., Kwan, J. W., Ng, A., Ni, P. A., Liu, W., Logan, B. G., Startsev, E., and Yuen, A. Thu . "NDCX-II target experiments and simulations". United States. doi:10.1016/j.nima.2013.05.096. https://www.osti.gov/servlets/purl/1245720.
@article{osti_1245720,
title = {NDCX-II target experiments and simulations},
author = {Barnard, J. J. and More, R. M. and Terry, M. and Friedman, A. and Henestroza, E. and Koniges, A. and Kwan, J. W. and Ng, A. and Ni, P. A. and Liu, W. and Logan, B. G. and Startsev, E. and Yuen, A.},
abstractNote = {The ion accelerator NDCX-II is undergoing commissioning at Lawrence Berkeley National Laboratory (LBNL). Its principal mission is to explore ion-driven High Energy Density Physics (HEDP) relevant to Inertial Fusion Energy (IFE) especially in the Warm Dense Matter (WDM) regime. We have carried out hydrodynamic simulations of beam-heated targets for parameters expected for the initial configuration of NDCX-II. For metal foils of order one micron thick (thin targets), the beam is predicted to heat the target in a timescale comparable to the hydrodynamic expansion time for experiments that infer material properties from measurements of the resulting rarefaction wave. We have also carried out hydrodynamic simulations of beam heating of metallic foam targets several tens of microns thick (thick targets) in which the ion range is shorter than the areal density of the material. In this case shock waves will form and we derive simple scaling laws for the efficiency of conversion of ion energy into kinetic energy of fluid flow. Geometries with a tamping layer may also be used to study the merging of a tamper shock with the end-of-range shock. As a result, this process can occur in tamped, direct drive IFE targets.},
doi = {10.1016/j.nima.2013.05.096},
journal = {Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment},
number = C,
volume = 733,
place = {United States},
year = {2013},
month = {6}
}

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