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Title: High-Energy X-Ray Imager for Laser-Fusion Research at the National Ignition Facility

Abstract

X-ray imaging will be an important diagnostic tool for inertial confinement fusion (ICF) research at the National Ignition Facility (NIF). However, high neutron yields will make x-ray imaging much more difficult than it is at smaller facilities. We analyze the feasibility and performance of a High-Energy X-Ray Imager (HEXRI) to be used on cryogenic DT implosions at NIF, with particular emphasis on spatial-resolution, field of view, signal-to-background and signal-to-noise ratios. Using a pinhole about 4 {micro}m in diameter a resolution of 5.8 {micro}m is achieved at 9 keV, limited by restrictions in the pinhole positioning. The resolution varies between 8.5 and 4.5 {micro}m in the 5-20 keV spectral range. Different options for the scintillating materials have been evaluated with the goal of having a sufficiently fast phosphor screen to allow time gating for minimizing neutron-induced background. Signal/Background (SBR) and Signal/Noise (SNR) ratios (limited to x-rays) have been calculated for different commercially-available scintillators, both showing adequate values with either a tantalum or a platinum pinhole substrate.

Authors:
;
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
US Department of Energy (US)
OSTI Identifier:
15016017
Report Number(s):
UCRL-TR-211667
TRN: US200509%%730
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 18 Apr 2005
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 42 ENGINEERING; CRYOGENICS; IMPLOSIONS; INERTIAL CONFINEMENT; NEUTRONS; PERFORMANCE; PHOSPHORS; PLATINUM; POSITIONING; RESOLUTION; SCREENS; SIGNAL-TO-NOISE RATIO; SPATIAL RESOLUTION; TANTALUM; US NATIONAL IGNITION FACILITY

Citation Formats

Tommasini, R, and Koch, J. High-Energy X-Ray Imager for Laser-Fusion Research at the National Ignition Facility. United States: N. p., 2005. Web. doi:10.2172/15016017.
Tommasini, R, & Koch, J. High-Energy X-Ray Imager for Laser-Fusion Research at the National Ignition Facility. United States. https://doi.org/10.2172/15016017
Tommasini, R, and Koch, J. 2005. "High-Energy X-Ray Imager for Laser-Fusion Research at the National Ignition Facility". United States. https://doi.org/10.2172/15016017. https://www.osti.gov/servlets/purl/15016017.
@article{osti_15016017,
title = {High-Energy X-Ray Imager for Laser-Fusion Research at the National Ignition Facility},
author = {Tommasini, R and Koch, J},
abstractNote = {X-ray imaging will be an important diagnostic tool for inertial confinement fusion (ICF) research at the National Ignition Facility (NIF). However, high neutron yields will make x-ray imaging much more difficult than it is at smaller facilities. We analyze the feasibility and performance of a High-Energy X-Ray Imager (HEXRI) to be used on cryogenic DT implosions at NIF, with particular emphasis on spatial-resolution, field of view, signal-to-background and signal-to-noise ratios. Using a pinhole about 4 {micro}m in diameter a resolution of 5.8 {micro}m is achieved at 9 keV, limited by restrictions in the pinhole positioning. The resolution varies between 8.5 and 4.5 {micro}m in the 5-20 keV spectral range. Different options for the scintillating materials have been evaluated with the goal of having a sufficiently fast phosphor screen to allow time gating for minimizing neutron-induced background. Signal/Background (SBR) and Signal/Noise (SNR) ratios (limited to x-rays) have been calculated for different commercially-available scintillators, both showing adequate values with either a tantalum or a platinum pinhole substrate.},
doi = {10.2172/15016017},
url = {https://www.osti.gov/biblio/15016017}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Apr 18 00:00:00 EDT 2005},
month = {Mon Apr 18 00:00:00 EDT 2005}
}