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Title: X-ray shadow imprint of hydrodynamic instabilities on the surface of inertial confinement fusion capsules by the fuel fill tube

Abstract

Measurements of hydrodynamic instability growth for a high-density carbon ablator for indirectly driven inertial confinement fusion implosions on the National Ignition Facility are reported. We observe significant unexpected features on the capsule surface created by shadows of the capsule fill tube, as illuminated by laser-irradiated x-ray spots on the hohlraum wall. These shadows increase the spatial size and shape of the fill tube perturbation in a way that can significantly degrade performance in layered implosions compared to previous expectations. The measurements were performed at a convergence ratio of ~2 using in-flight x-ray radiography. The initial seed due to shadow imprint is estimated to be equivalent to ~50–100 nm of solid ablator material. As a result, this discovery has prompted the need for a mitigation strategy for future inertial confinement fusion designs as proposed here.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [2];  [1];  [1];  [1];  [1]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. General Atomics, San Diego, CA (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1366956
Alternate Identifier(s):
OSTI ID: 1349398
Report Number(s):
LLNL-JRNL-732482
Journal ID: ISSN 2470-0045; PLEEE8
Grant/Contract Number:
AC52-07NA27344
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review E
Additional Journal Information:
Journal Volume: 95; Journal Issue: 3; Journal ID: ISSN 2470-0045
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION; 42 ENGINEERING

Citation Formats

MacPhee, A. G., Casey, D. T., Clark, D. S., Felker, S., Field, J. E., Haan, S. W., Hammel, B. A., Kroll, J., Landen, O. L., Martinez, D. A., Michel, P., Milovich, J., Moore, A., Nikroo, A., Rice, N., Robey, H. F., Smalyuk, V. A., Stadermann, M., and Weber, C. R.. X-ray shadow imprint of hydrodynamic instabilities on the surface of inertial confinement fusion capsules by the fuel fill tube. United States: N. p., 2017. Web. doi:10.1103/PhysRevE.95.031204.
MacPhee, A. G., Casey, D. T., Clark, D. S., Felker, S., Field, J. E., Haan, S. W., Hammel, B. A., Kroll, J., Landen, O. L., Martinez, D. A., Michel, P., Milovich, J., Moore, A., Nikroo, A., Rice, N., Robey, H. F., Smalyuk, V. A., Stadermann, M., & Weber, C. R.. X-ray shadow imprint of hydrodynamic instabilities on the surface of inertial confinement fusion capsules by the fuel fill tube. United States. doi:10.1103/PhysRevE.95.031204.
MacPhee, A. G., Casey, D. T., Clark, D. S., Felker, S., Field, J. E., Haan, S. W., Hammel, B. A., Kroll, J., Landen, O. L., Martinez, D. A., Michel, P., Milovich, J., Moore, A., Nikroo, A., Rice, N., Robey, H. F., Smalyuk, V. A., Stadermann, M., and Weber, C. R.. Thu . "X-ray shadow imprint of hydrodynamic instabilities on the surface of inertial confinement fusion capsules by the fuel fill tube". United States. doi:10.1103/PhysRevE.95.031204. https://www.osti.gov/servlets/purl/1366956.
@article{osti_1366956,
title = {X-ray shadow imprint of hydrodynamic instabilities on the surface of inertial confinement fusion capsules by the fuel fill tube},
author = {MacPhee, A. G. and Casey, D. T. and Clark, D. S. and Felker, S. and Field, J. E. and Haan, S. W. and Hammel, B. A. and Kroll, J. and Landen, O. L. and Martinez, D. A. and Michel, P. and Milovich, J. and Moore, A. and Nikroo, A. and Rice, N. and Robey, H. F. and Smalyuk, V. A. and Stadermann, M. and Weber, C. R.},
abstractNote = {Measurements of hydrodynamic instability growth for a high-density carbon ablator for indirectly driven inertial confinement fusion implosions on the National Ignition Facility are reported. We observe significant unexpected features on the capsule surface created by shadows of the capsule fill tube, as illuminated by laser-irradiated x-ray spots on the hohlraum wall. These shadows increase the spatial size and shape of the fill tube perturbation in a way that can significantly degrade performance in layered implosions compared to previous expectations. The measurements were performed at a convergence ratio of ~2 using in-flight x-ray radiography. The initial seed due to shadow imprint is estimated to be equivalent to ~50–100 nm of solid ablator material. As a result, this discovery has prompted the need for a mitigation strategy for future inertial confinement fusion designs as proposed here.},
doi = {10.1103/PhysRevE.95.031204},
journal = {Physical Review E},
number = 3,
volume = 95,
place = {United States},
year = {Thu Mar 30 00:00:00 EDT 2017},
month = {Thu Mar 30 00:00:00 EDT 2017}
}

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