skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Use of d-{sup 3}He proton spectroscopy as a diagnostic of shell {rho}r in capsule implosion experiments with {approx}0.2 NIF scale high temperature Hohlraums at Omega

Abstract

We present the calculations and preliminary results from experiments on the Omega laser facility using d-{sup 3}He filled plastic capsule implosions in gold Hohlraums. These experiments aim to develop a technique to measure shell {rho}r and capsule unablated mass with proton spectroscopy and will be applied to future National Ignition Facility (NIF) experiments with ignition scale capsules. The Omega Hohlraums are 1900 {mu}m lengthx1200 {mu}m diameter and have a 70% laser entrance hole. This is approximately a 0.2 NIF scale ignition Hohlraum and reaches temperatures of 265-275 eV similar to those during the peak of the NIF drive. These capsules can be used as a diagnostic of shell {rho}r, since the d-{sup 3}He gas fill produces 14.7 MeV protons in the implosion, which escape through the shell and produce a proton spectrum that depends on the integrated {rho}r of the remaining shell mass. The neutron yield, proton yield, and spectra change with capsule shell thickness as the unablated mass or remaining capsule {rho}r changes. Proton stopping models are used to infer shell unablated mass and shell {rho}r from the proton spectra measured with different filter thicknesses. The experiment is well modeled with respect to Hohlraum energetics, neutron yields, and x-raymore » imploded core image size, but there are discrepancies between the observed and simulated proton spectra.« less

Authors:
; ; ; ; ; ;  [1]; ;  [2]; ; ;  [3]
  1. Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
  2. L.L.E., University of Rochester, Rochester, New York 14627 (United States)
  3. M.I.T., Cambridge, Massachusetts 02139-4307 (United States)
Publication Date:
OSTI Identifier:
21266515
Resource Type:
Journal Article
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 79; Journal Issue: 10; Other Information: DOI: 10.1063/1.2978198; (c) 2008 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0034-6748
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; CAPSULES; GOLD; HELIUM 3; IMPLOSIONS; LASERS; NEUTRONS; PLASMA SIMULATION; PLASTICS; PROTON SPECTRA; PROTONS; SHELLS; SPECTROSCOPY; US NATIONAL IGNITION FACILITY; X RADIATION

Citation Formats

Delamater, N D, Wilson, D C, Kyrala, G A, Seifter, A, Hoffman, N M, Dodd, E, Singleton, R, Glebov, V, Stoeckl, C, Li, C K, Petrasso, R, and Frenje, J. Use of d-{sup 3}He proton spectroscopy as a diagnostic of shell {rho}r in capsule implosion experiments with {approx}0.2 NIF scale high temperature Hohlraums at Omega. United States: N. p., 2008. Web. doi:10.1063/1.2978198.
Delamater, N D, Wilson, D C, Kyrala, G A, Seifter, A, Hoffman, N M, Dodd, E, Singleton, R, Glebov, V, Stoeckl, C, Li, C K, Petrasso, R, & Frenje, J. Use of d-{sup 3}He proton spectroscopy as a diagnostic of shell {rho}r in capsule implosion experiments with {approx}0.2 NIF scale high temperature Hohlraums at Omega. United States. doi:10.1063/1.2978198.
Delamater, N D, Wilson, D C, Kyrala, G A, Seifter, A, Hoffman, N M, Dodd, E, Singleton, R, Glebov, V, Stoeckl, C, Li, C K, Petrasso, R, and Frenje, J. Wed . "Use of d-{sup 3}He proton spectroscopy as a diagnostic of shell {rho}r in capsule implosion experiments with {approx}0.2 NIF scale high temperature Hohlraums at Omega". United States. doi:10.1063/1.2978198.
@article{osti_21266515,
title = {Use of d-{sup 3}He proton spectroscopy as a diagnostic of shell {rho}r in capsule implosion experiments with {approx}0.2 NIF scale high temperature Hohlraums at Omega},
author = {Delamater, N D and Wilson, D C and Kyrala, G A and Seifter, A and Hoffman, N M and Dodd, E and Singleton, R and Glebov, V and Stoeckl, C and Li, C K and Petrasso, R and Frenje, J},
abstractNote = {We present the calculations and preliminary results from experiments on the Omega laser facility using d-{sup 3}He filled plastic capsule implosions in gold Hohlraums. These experiments aim to develop a technique to measure shell {rho}r and capsule unablated mass with proton spectroscopy and will be applied to future National Ignition Facility (NIF) experiments with ignition scale capsules. The Omega Hohlraums are 1900 {mu}m lengthx1200 {mu}m diameter and have a 70% laser entrance hole. This is approximately a 0.2 NIF scale ignition Hohlraum and reaches temperatures of 265-275 eV similar to those during the peak of the NIF drive. These capsules can be used as a diagnostic of shell {rho}r, since the d-{sup 3}He gas fill produces 14.7 MeV protons in the implosion, which escape through the shell and produce a proton spectrum that depends on the integrated {rho}r of the remaining shell mass. The neutron yield, proton yield, and spectra change with capsule shell thickness as the unablated mass or remaining capsule {rho}r changes. Proton stopping models are used to infer shell unablated mass and shell {rho}r from the proton spectra measured with different filter thicknesses. The experiment is well modeled with respect to Hohlraum energetics, neutron yields, and x-ray imploded core image size, but there are discrepancies between the observed and simulated proton spectra.},
doi = {10.1063/1.2978198},
journal = {Review of Scientific Instruments},
issn = {0034-6748},
number = 10,
volume = 79,
place = {United States},
year = {2008},
month = {10}
}