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Capsule implosions for continuum x-ray backlighting of opacity samples at the National Ignition Facility.

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??m 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??m 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.

SUBMITTER: Opachich YP 

PROVIDER: S-EPMC5648568 | biostudies-literature | 2017 Jun

REPOSITORIES: biostudies-literature

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Capsule implosions for continuum x-ray backlighting of opacity samples at the National Ignition Facility.

Opachich Y P YP   Heeter R F RF   Barrios M A MA   Garcia E M EM   Craxton R S RS   King J A JA   Liedahl D A DA   McKenty P W PW   Schneider M B MB   May M J MJ   Zhang R R   Ross P W PW   Kline J L JL   Moore A S AS   Weaver J L JL   Flippo K A KA   Perry T S TS  

Physics of plasmas 20170608 6

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 <i>μ</i>m thickness have been performed. X-ray yields of up to ∼1 kJ/sr have been measured using the Dante multichannel diode a  ...[more]