Capsule implosions for continuum x-ray backlighting of opacity samples at the National Ignition Facility
- 1 June 2017
- journal article
- research article
- Published by AIP Publishing in Physics of Plasmas
- Vol. 24 (6), 063301
- https://doi.org/10.1063/1.4985076
Abstract
Direct drive implosions of plastic capsules have been performed at the National Ignition Facility to provide a broad-spectrum (500–2000 eV) X-ray continuum source for X-ray transmission spectroscopy. The source was developed for the high-temperature plasma opacity experimental platform. Initial experiments using 2.0 mm diameter polyalpha-methyl styrene capsules with ∼20 μm thickness have been performed. X-ray yields of up to ∼1 kJ/sr have been measured using the Dante multichannel diode array. The backlighter source size was measured to be ∼100 μm FWHM, with ∼350 ps pulse duration during the peak emission stage. Results are used to simulate transmission spectra for a hypothetical iron opacity sample at 150 eV, enabling the derivation of photometrics requirements for future opacity experiments.Keywords
Funding Information
- U.S. Department of Energy (DE-AC52-06NA25396, DE-AC52-07NA27344, DOE/NV/25946-3139)
- Wellcome Trust
- National Institutes of Health
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