Design calculations for a xenon plasma x-ray shield to protect the NIF optical Thomson scattering diagnostic
Abstract
An Optical Thomson Scattering (OTS) diagnostic is currently being developed for the National Ignition Facility (NIF) at Lawrence Livermore National Labs (LLNL). This diagnostic is designed to make measurements of hohlraum plasma parameters, such as the electron temperature and density, during inertial confinement fusion (ICF) experiments. NIF ICF experiments present a very challenging environment for optical measurements; by their very nature hohlraums produce intense soft x-ray emission, which can cause “blanking” (radiation induced opacity) of the radiation facing optical components. The soft x-ray fluence at the surface of the OTS blast shield, 60 cm from the hohlraum, is estimated to be ~ 8 J cm-2. This is then significantly above the expected threshold for the onset of “blanking” effects. A novel Xenon Plasma X-ray Shield (XPXS) has been proposed to protect the blast shield from x-rays and mitigate “blanking”. Finally, these estimates suggest that an areal density of 1019 cm-2 Xe atoms will be sufficient to absorb 99.5% the soft x-ray flux. Two potential designs for this shield are presented.
- Authors:
-
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Publication Date:
- Research Org.:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1258507
- Report Number(s):
- LLNL-CONF-693137
Journal ID: ISSN 0034-6748; RSINAK
- Grant/Contract Number:
- AC52-07NA27344
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Review of Scientific Instruments
- Additional Journal Information:
- Journal Volume: 87; Journal Issue: 11; Conference: Presented at: High Temperature Plasma Diagnostics, Madiso, WI, United States, Jun 05 - Jun 09, 2016; Journal ID: ISSN 0034-6748
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION; 42 ENGINEERING; x-ray plasma diagnostics; soft x-rays; hohlram; experiment design; x-ray scattering
Citation Formats
Swadling, G. F., Ross, J. S., Datte, P., Moody, J., Divol, L., Jones, O., and Landen, O. Design calculations for a xenon plasma x-ray shield to protect the NIF optical Thomson scattering diagnostic. United States: N. p., 2016.
Web. doi:10.1063/1.4958913.
Swadling, G. F., Ross, J. S., Datte, P., Moody, J., Divol, L., Jones, O., & Landen, O. Design calculations for a xenon plasma x-ray shield to protect the NIF optical Thomson scattering diagnostic. United States. https://doi.org/10.1063/1.4958913
Swadling, G. F., Ross, J. S., Datte, P., Moody, J., Divol, L., Jones, O., and Landen, O. Thu .
"Design calculations for a xenon plasma x-ray shield to protect the NIF optical Thomson scattering diagnostic". United States. https://doi.org/10.1063/1.4958913. https://www.osti.gov/servlets/purl/1258507.
@article{osti_1258507,
title = {Design calculations for a xenon plasma x-ray shield to protect the NIF optical Thomson scattering diagnostic},
author = {Swadling, G. F. and Ross, J. S. and Datte, P. and Moody, J. and Divol, L. and Jones, O. and Landen, O.},
abstractNote = {An Optical Thomson Scattering (OTS) diagnostic is currently being developed for the National Ignition Facility (NIF) at Lawrence Livermore National Labs (LLNL). This diagnostic is designed to make measurements of hohlraum plasma parameters, such as the electron temperature and density, during inertial confinement fusion (ICF) experiments. NIF ICF experiments present a very challenging environment for optical measurements; by their very nature hohlraums produce intense soft x-ray emission, which can cause “blanking” (radiation induced opacity) of the radiation facing optical components. The soft x-ray fluence at the surface of the OTS blast shield, 60 cm from the hohlraum, is estimated to be ~ 8 J cm-2. This is then significantly above the expected threshold for the onset of “blanking” effects. A novel Xenon Plasma X-ray Shield (XPXS) has been proposed to protect the blast shield from x-rays and mitigate “blanking”. Finally, these estimates suggest that an areal density of 1019 cm-2 Xe atoms will be sufficient to absorb 99.5% the soft x-ray flux. Two potential designs for this shield are presented.},
doi = {10.1063/1.4958913},
journal = {Review of Scientific Instruments},
number = 11,
volume = 87,
place = {United States},
year = {Thu Jul 21 00:00:00 EDT 2016},
month = {Thu Jul 21 00:00:00 EDT 2016}
}
Web of Science
Works referenced in this record:
Optical transmission of glass for the National Ignition Facility near backscatter imagers under x-ray exposure
journal, October 2008
- London, R. A.; Froula, D. H.; Sorce, C. M.
- Review of Scientific Instruments, Vol. 79, Issue 10
X-ray conversion efficiency of high-Z hohlraum wall materials for indirect drive ignition
journal, July 2008
- Dewald, E. L.; Rosen, M.; Glenzer, S. H.
- Physics of Plasmas, Vol. 15, Issue 7
Dante soft x-ray power diagnostic for National Ignition Facility
journal, October 2004
- Dewald, E. L.; Campbell, K. M.; Turner, R. E.
- Review of Scientific Instruments, Vol. 75, Issue 10
A reflective optical transport system for ultraviolet Thomson scattering from electron plasma waves on OMEGA
journal, October 2012
- Katz, J.; Boni, R.; Sorce, C.
- Review of Scientific Instruments, Vol. 83, Issue 10
X-Ray Interactions: Photoabsorption, Scattering, Transmission, and Reflection at E = 50-30,000 eV, Z = 1-92
journal, July 1993
- Henke, B. L.; Gullikson, E. M.; Davis, J. C.
- Atomic Data and Nuclear Data Tables, Vol. 54, Issue 2, p. 181-342
Omega Dante soft x-ray power diagnostic component calibration at the National Synchrotron Light Source
journal, October 2004
- Campbell, K. M.; Weber, F. A.; Dewald, E. L.
- Review of Scientific Instruments, Vol. 75, Issue 10
Thomson-scattering techniques to diagnose local electron and ion temperatures, density, and plasma wave amplitudes in laser produced plasmas (invited)
journal, October 2006
- Froula, D. H.; Ross, J. S.; Divol, L.
- Review of Scientific Instruments, Vol. 77, Issue 10
Correct values for high-frequency power absorption by inverse bremsstrahlung in plasmas
journal, January 1973
- Johnston, Tudor Wyatt
- Physics of Fluids, Vol. 16, Issue 5
Evaluation of Several Issues Concerning Laser Beam Propagation through the LIFE Target Chamber
journal, August 2009
- Wilks, S. C.; Cohen, B. I.; Latkowski, J. F.
- Fusion Science and Technology, Vol. 56, Issue 2
Works referencing / citing this record:
Impact of non-Maxwellian electron velocity distribution functions on inferred plasma parameters in collective Thomson scattering
journal, February 2019
- Milder, A. L.; Ivancic, S. T.; Palastro, J. P.
- Physics of Plasmas, Vol. 26, Issue 2