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Titolo:
INDIRECTLY DRIVEN, HIGH GROWTH RAYLEIGH-TAYLOR IMPLOSIONS ON NOVA
Autore:
LANDEN OL; KEANE CJ; HAMMEL BA; CABLE MD; COLVIN J; COOK R; DITTRICH TR; HAAN SW; HATCHETT SP; HAY RG; KILKENNY JD; LERCHE RA; LEVEDAHL WK; MCEACHERN R; MURPHY TJ; NELSON MB; SUTER L; WALLACE RJ;
Indirizzi:
LAWRENCE LIVERMORE NATL LAB,POB 5508 LIVERMORE CA 94550
Titolo Testata:
Journal of quantitative spectroscopy & radiative transfer
fascicolo: 1-2, volume: 54, anno: 1995,
pagine: 245 - 255
SICI:
0022-4073(1995)54:1-2<245:IDHGRI>2.0.ZU;2-O
Fonte:
ISI
Lingua:
ENG
Soggetto:
X-RAY SPECTROSCOPY; FUSION; INSTABILITY; MATTER;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
26
Recensione:
Indirizzi per estratti:
Citazione:
O.L. Landen et al., "INDIRECTLY DRIVEN, HIGH GROWTH RAYLEIGH-TAYLOR IMPLOSIONS ON NOVA", Journal of quantitative spectroscopy & radiative transfer, 54(1-2), 1995, pp. 245-255

Abstract

Indirectly-driven implosions for which the predicted Rayleigh-Taylor (RT) instability growth rates of pre-imposed capsule surface perturbations are substantially increased by mid-Z-doping of the ablators have been fielded on the Nova laser. The multiple effects on implosion performance of the additional x-ray opacity provided by the ablator dopantis discussed. For best surface finish capsules, the addition of increasing ablator dopant levels is shown to improve the neutron yield. However, as capsule surface roughness is increased, so that RT instability growth increases, this trend is reversed, leading to decreasing yields with increased dopant content. The RT-induced mixing between shell and fuel is further investigated by diagnosing the x-ray emission levels and time histories from Ti and Ar dopants in capsules with predetermined surface roughness. The x-ray line ratios show the expected decrease in fuel temperature with increasing surface roughness. The spectral content, intensity and duration of the Ti spectra, however, suggest 2- or 3-D rather than just 1-D effects are important so that higher than 1-D models of the mix region may be needed.

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Documento generato il 22/09/20 alle ore 15:08:57