Use of d-3He proton spectroscopy as a diagnostic of shell rho r in capsule implosion experiments with approximately 0.2 NIF scale high temperature Hohlraums at Omega.
| Title: | Use of d-3He proton spectroscopy as a diagnostic of shell rho r in capsule implosion experiments with approximately 0.2 NIF scale high temperature Hohlraums at Omega. |
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| Authors: | Delamater ND; Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.; Wilson DC; Kyrala GA; Seifter A; Hoffman NM; Dodd E; Singleton R; Glebov V; Stoeckl C; Li CK; Petrasso R; Frenje J |
| Source: | The Review of scientific instruments [Rev Sci Instrum] 2008 Oct; Vol. 79 (10), pp. 10E526. |
| Publication Type: | Journal Article |
| Language: | English |
| Journal Info: | Publisher: American Institute Of Physics Country of Publication: United States NLM ID: 0405571 Publication Model: Print Cited Medium: Internet ISSN: 1089-7623 (Electronic) Linking ISSN: 00346748 NLM ISO Abbreviation: Rev Sci Instrum Subsets: PubMed not MEDLINE |
| Imprint Name(s): | Publication: 1933- : Woodbury, N.Y. : American Institute Of Physics; Original Publication: 1930-1932 : Menasha, WI : Optical Society of America |
| Abstract: | We present the calculations and preliminary results from experiments on the Omega laser facility using d-(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 microm length x 1200 microm 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-(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. |
| Entry Date(s): | Date Created: 20081203 Date Completed: 20090217 Latest Revision: 20081202 |
| Update Code: | 20260130 |
| DOI: | 10.1063/1.2978198 |
| PMID: | 19044507 |
| Database: | MEDLINE |
Journal Article