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Title: Permeation fill-tube design for inertial confinement fusion target capsules

Abstract

A unique approach for permeation filling of nonpermeable inertial confinement fusion target capsules with deuterium–tritium (DT) is presented. This process uses a permeable capsule coupled into the final target capsule with a 0.03-mm-diameter fill tube. Leak free permeation filling of glow-discharge polymerization (GDP) targets using this method have been successfully demonstrated, as well as ice layering of the target, yielding an inner ice surface roughness of 1-$$\unicode[STIX]{x03BC}$$m rms (root mean square). Finally, the measured DT ice-thickness profile for this experiment was used to validate a thermal model’s prediction of the same thickness profile.

Authors:
 [1];  [2];  [2];  [3];  [3];  [4]
  1. Rochester Inst. of Tech., Rochester, NY (United States)
  2. Univ. of Rochester, NY (United States). Lab. for Laser Energetics
  3. General Atomics, San Diego, CA (United States)
  4. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Research Org.:
Univ. of Rochester, NY (United States). Lab. for Laser Energetics
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1375902
Report Number(s):
2016-217, 1350
Journal ID: ISSN 2095-4719; applab; PII: S2095471917000056; TRN: US1702209
Grant/Contract Number:
NA0001944
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
High Power Laser Science and Engineering
Additional Journal Information:
Journal Volume: 5; Journal ID: ISSN 2095-4719
Publisher:
Cambridge University Press
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; fill-tube; inertial confinement fusion; permeation fill; target capsule

Citation Formats

Rice, B. S., Ulreich, J., Fella, C., Crippen, J., Fitzsimmons, P., and Nikroo, A.. Permeation fill-tube design for inertial confinement fusion target capsules. United States: N. p., 2017. Web. doi:10.1017/hpl.2017.5.
Rice, B. S., Ulreich, J., Fella, C., Crippen, J., Fitzsimmons, P., & Nikroo, A.. Permeation fill-tube design for inertial confinement fusion target capsules. United States. doi:10.1017/hpl.2017.5.
Rice, B. S., Ulreich, J., Fella, C., Crippen, J., Fitzsimmons, P., and Nikroo, A.. Wed . "Permeation fill-tube design for inertial confinement fusion target capsules". United States. doi:10.1017/hpl.2017.5. https://www.osti.gov/servlets/purl/1375902.
@article{osti_1375902,
title = {Permeation fill-tube design for inertial confinement fusion target capsules},
author = {Rice, B. S. and Ulreich, J. and Fella, C. and Crippen, J. and Fitzsimmons, P. and Nikroo, A.},
abstractNote = {A unique approach for permeation filling of nonpermeable inertial confinement fusion target capsules with deuterium–tritium (DT) is presented. This process uses a permeable capsule coupled into the final target capsule with a 0.03-mm-diameter fill tube. Leak free permeation filling of glow-discharge polymerization (GDP) targets using this method have been successfully demonstrated, as well as ice layering of the target, yielding an inner ice surface roughness of 1-$\unicode[STIX]{x03BC}$m rms (root mean square). Finally, the measured DT ice-thickness profile for this experiment was used to validate a thermal model’s prediction of the same thickness profile.},
doi = {10.1017/hpl.2017.5},
journal = {High Power Laser Science and Engineering},
number = ,
volume = 5,
place = {United States},
year = {Wed Mar 22 00:00:00 EDT 2017},
month = {Wed Mar 22 00:00:00 EDT 2017}
}

Journal Article:
Free Publicly Available Full Text
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  • Cited by 4
  • 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 imprintmore » 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.« less
  • On the first inertial-confinement-fusion ignition facility, the target capsule will be DT filled through a long, narrow tube inserted into the shell. {mu}g-scale shell perturbations {delta}m{sup '} arising from multiple, 10-50 {mu}m-diameter, hollow SiO{sub 2} tubes on x-ray-driven, ignition-scale, 1-mg capsules have been measured on a subignition device. Simulations compare well with observation, whence it is corroborated that {delta}m{sup '} arises from early x-ray shadowing by the tube rather than tube mass coupling to the shell, and inferred that 10-20 {mu}m tubes will negligibly affect fusion yield on a full-ignition facility.
  • We present on the first inertial-confinement-fusion ignition facility, the target capsule will be DT filled through a long, narrow tube inserted into the shell. μg-scale shell perturbations Δm' arising from multiple, 10–50 μm-diameter, hollow SiO 2 tubes on x-ray-driven, ignition-scale, 1-mg capsules have been measured on a subignition device. Finally, simulations compare well with observation, whence it is corroborated that Δm' arises from early x-ray shadowing by the tube rather than tube mass coupling to the shell, and inferred that 10–20 μm tubes will negligibly affect fusion yield on a full-ignition facility.
  • Calculations are presented for a high yield inertial fusion design, employing indirect drive with a double-ended {ital z}-pinch-driven hohlraum radiation source. A high current ({approximately}60 MA) accelerator implodes {ital z} pinches within an enclosing hohlraum. Radial spoke arrays and shine shields isolate the capsule from the pinch plasma, magnetic field, and direct x-ray shine. Our approach places minimal requirements on {ital z}-pinch uniformity and stability, usually problematic due to magneto-Rayleigh{endash}Taylor instability. Large inhomogeneities of the pinch and spoke array may be present, but the hohlraum adequately smooths the radiation field at the capsule. Simultaneity and reproducibility of the pinch x-raymore » output to better than 7{percent} are required, however, for good symmetry. Recent experiments suggest a pulse shaping technique, through implosion of a multishell {ital z} pinch. X-ray bursts are calculated and observed to occur at each shell collision. A capsule absorbing 1 MJ of x rays at a peak drive temperature of 210 eV is found to have adequate stability and to produce 400 MJ of yield. A larger capsule absorbs 2 MJ with a yield of 1200 MJ. {copyright} {ital 1999 American Institute of Physics.}« less