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Title: A broadband proton backlighting platform to probe shock propagation in low-density systems

Abstract

Here, a proton backlighting platform has been developed for the study of strong shock propagation in low-density systems in planar geometry. Electric fields at the converging shock front in inertial confinement fusion implosions have been previously observed, demonstrating the presence of—and the need to understand—strong electric fields not modeled in standard radiation-hydrodynamic simulations. In this planar configuration, long-pulse ultraviolet lasers are used to drive a strong shock into a gas-cell target, while a short-pulse proton backlighter side-on radiographs the shock propagation. The capabilities of the platform are presented here. Future experiments will vary shock strength and gas fill, to probe shock conditions at different Z and Te.

Authors:
ORCiD logo [1];  [2];  [3]; ORCiD logo [2];  [2]; ORCiD logo [3];  [1]; ORCiD logo [1];  [3]
+ Show Author Affiliations
  1. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center
  2. Univ. of California, San Diego, CA (United States). Center for Energy Research
  3. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Research Org.:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center; Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Fusion Energy Sciences (FES)
OSTI Identifier:
1348908
Alternate Identifier(s):
OSTI ID: 1348909; OSTI ID: 1438717
Report Number(s):
LLNL-JRNL-740687; LLNL-JRNL-684299
Journal ID: ISSN 0034-6748; TRN: US1700970
Grant/Contract Number:  
NA0002949; AC52-07NA27344; FA9550-14-1-0346; FC52-08NA28752; NA0002726
Resource Type:
Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 88; Journal Issue: 1; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Protons; Radiography; Electric fields; Helium-4; Spatial resolution; 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; 70 PLASMA PHYSICS AND FUSION

Citation Formats

Sio, H., Hua, R., Ping, Y., McGuffey, C., Beg, F., Heeter, R., Li, C. K., Petrasso, R. D., and Collins, G. W. A broadband proton backlighting platform to probe shock propagation in low-density systems. United States: N. p., 2017. Web. doi:10.1063/1.4973893.
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Sio, H., Hua, R., Ping, Y., McGuffey, C., Beg, F., Heeter, R., Li, C. K., Petrasso, R. D., & Collins, G. W. A broadband proton backlighting platform to probe shock propagation in low-density systems. United States. https://doi.org/10.1063/1.4973893
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Sio, H., Hua, R., Ping, Y., McGuffey, C., Beg, F., Heeter, R., Li, C. K., Petrasso, R. D., and Collins, G. W. Tue . "A broadband proton backlighting platform to probe shock propagation in low-density systems". United States. https://doi.org/10.1063/1.4973893. https://www.osti.gov/servlets/purl/1348908.
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@article{osti_1348908,
title = {A broadband proton backlighting platform to probe shock propagation in low-density systems},
author = {Sio, H. and Hua, R. and Ping, Y. and McGuffey, C. and Beg, F. and Heeter, R. and Li, C. K. and Petrasso, R. D. and Collins, G. W.},
abstractNote = {Here, a proton backlighting platform has been developed for the study of strong shock propagation in low-density systems in planar geometry. Electric fields at the converging shock front in inertial confinement fusion implosions have been previously observed, demonstrating the presence of—and the need to understand—strong electric fields not modeled in standard radiation-hydrodynamic simulations. In this planar configuration, long-pulse ultraviolet lasers are used to drive a strong shock into a gas-cell target, while a short-pulse proton backlighter side-on radiographs the shock propagation. The capabilities of the platform are presented here. Future experiments will vary shock strength and gas fill, to probe shock conditions at different Z and Te.},
doi = {10.1063/1.4973893},
journal = {Review of Scientific Instruments},
number = 1,
volume = 88,
place = {United States},
year = {Tue Jan 17 00:00:00 EST 2017},
month = {Tue Jan 17 00:00:00 EST 2017}
}
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Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1063/1.4973893
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Citation Metrics:
Cited by: 5 works
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Figures / Tables:

Figure 1 Figure 1: In the experimental configuration, a) up to three long-pulse UV lasers drive a strong shock through a CH ablator which unloads into a gas region. At different delays after the main laser drive, a short pulse laser irradiates a side-on proton backlighter for radiography. The short-pulse proton backlightermore » is placed 8 mm away from the center of the gas cell, and the RCF film pack can be placed 8 cm to 20 cm away from the gas cell for different magnifications. Figure 1b shows a CAD model of the gas cell target, as seen by the proton backlighter. Figure 1c is an example proton radiograph of the shock front as imaged by ~ 13 MeV protons, at t = 4.2 ns after the main drive lasers turned on for OMEGA EP shot 21793. Figure 1d is a zoomed lineout of the shock front region, with the valley and the peak in proton fluence corresponding to the ablator region and the shock-front region, respectively. The red lineout is a lineout of the 13 MeV proton radiograph in Fig 1c. The blue lineout is a lineout of the 8 MeV proton radiograph (not shown) on the same shot. The two lineouts are scaled to each other to better show differences in the widths and deflections.« less
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    Works referencing / citing this record:

    Fuel-ion diffusion in shock-driven inertial confinement fusion implosions
    journal, September 2019

    • Sio, Hong; Li, Chikang; Parker, Cody E.
    • Matter and Radiation at Extremes, Vol. 4, Issue 5
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    • Plasma Physics and Controlled Fusion, Vol. 60, Issue 6
    • DOI: 10.1088/1361-6587/aab79f
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      Figures / Tables found in this record:

      Figure 1 (p. 6)figure
      Figure 2 (p. 8)figure
      Figure 3 (p. 10)figure
      Figure 4 (p. 12)figure
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