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

Abstract

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. Finally, 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 T e.

Authors:
ORCiD logo [1];  [2];  [3]; ORCiD logo [2];  [2]; ORCiD logo [3];  [1]; ORCiD logo [1];  [3]
  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
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)
OSTI Identifier:
1348908
Alternate Identifier(s):
OSTI ID: 1348909
Grant/Contract Number:
NA0002949; AC52-07NA27344; FA9550-14-1-0346; FC52-08NA28752; NA0002726
Resource Type:
Journal Article: 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

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.
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. doi:10.1063/1.4973893.
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. doi:10.1063/1.4973893. https://www.osti.gov/servlets/purl/1348908.
@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 = {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. Finally, 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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  • 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. Lastly, the capabilities of the platform are presented here. Future experiments will vary shock strength and gas fill, to probemore » shock conditions at different Z and T e.« less
  • Cited by 2
  • Low-density plastic foam filled with liquid deuterium is one of the candidates for inertial fusion target. Density profile and trajectory of 527 nm laser-irradiated planer foam-deuterium target in the acceleration phase were observed with streaked side-on x-ray backlighting. An x-ray imager employing twin slits coupled to an x-ray streak camera was used to simultaneously observe three images of the target: self-emission from the target, x-ray backlighter profile, and the backlit target. The experimentally obtained density profile and trajectory were in good agreement with predictions by one-dimensional hydrodynamic simulation code ILESTA-1D.
  • Broad bandwidth (60 kHz {le}{ital f}{le}500 kHz), long wavelength ({ital {bar k}}{sub {theta}}{le}2 cm{sup {minus}1}) density fluctuation measurements were made using a heavy ion beam probe on the Texas Experimental Tokamak (TEXT) [K. W. Gentle, Nucl. Technol./Fusion {bold 1}, 479 (1981)]. Fluctuation amplitudes and correlation length scalings do not correspond to linear or quasilinear drift wave theory. Power-weighted root-mean-square (rms) wave number estimates are much lower ({l_angle}{ital {bar k}}{sub {theta}}{r_angle}{sub rms}{rho}{sub {ital s}}{le}0.1, {rho}{sub {ital s}}=[{ital m}{sub {ital iT}}{sub {ital e}}]{sup 1/2}/{ital eB}) than quasilinear theoretical expectations ({ital {bar k}}{sub {perpendicular}}{rho}{sub {ital s}}{similar_to}0.3). Core results indicate strong turbulence with amore » wave number spread, {Delta}{ital k}{similar_to}{ital {bar k}} at fixed frequency {ital f}, consistent with strong turbulence predictions, while edge results can be considered consistent with weak turbulence. In between the core and edge (0.6{le}{ital r}/{ital a}{le}0.8) is a transition region. {copyright} {ital 1995} {ital American} {ital Institute} {ital of} {ital Physics}.« less
  • Here, a thin-glass-shell, D 3He-filled exploding-pusher inertial confinement fusion implosion at the National Ignition Facility (NIF) has been demonstrated as a proton source that serves as a promising first step toward development of a monoenergetic proton, alpha, and triton backlighting platform at the NIF. Among the key measurements, the D 3He-proton emission on this experiment (shot N121128) has been well-characterized spectrally, temporally, and in terms of emission isotropy, revealing a highly monoenergetic (ΔE/E~4%) and isotropic source (~3% proton fluence variation and ~0.5% proton energy variation). On a similar shot (N130129, with D 2 fill), the DD-proton spectrum has been obtainedmore » as well, illustrating that monoenergetic protons of multiple energies may be utilized in a single experiment. These results, and experiments on OMEGA, point toward future steps in the development of a precision, monoenergetic proton, alpha, and triton source that can readily be implemented at the NIF for backlighting a broad range of high energy density physics (HEDP) experiments in which fields and flows are manifest, and also utilized for studies of stopping power in warm dense matter and in classical plasmas.« less