High-density carbon ablator experiments on the National Ignition Facility

Autor:	J. D. Lindl, D. Fittinghoff, Johan Frenje, J. D. Moody, J. Biener, S. Haan, N. B. Meezan, E. Storm, L. Divol, J. P. Knauer, L. Berzak Hopkins, J. Milovich, D. K. Bradley, B. Kozioziemski, K. A. Moreno, C. K. Li, J. E. Ralph, Darwin Ho, P. M. Celliers, Gilbert Collins, J. Sater, Abbas Nikroo, D. A. Callahan, D. G. Braun, R. D. Petrasso, S. Le Pape, O. Landen, F. Merrill, R. J. Wallace, R. P. J. Town, J. Caggiano, T. Döppner, J. L. Atherton, L. R. Benedetti, R. Hatarik, J. McNaney, A. Pak, P. K. Patel, E. Werner, James Ross, D. Hoover, O. S. Jones, Fredrick Seguin, S. T. Prisbrey, H. R. Robey, Melissa Edwards, Cliff Thomas, R. Olson, G. A. Kyrala, E. L. Dewald, R. Tommasini, Michael Rosenberg, N. Guler, J. D. Kilkenny, T. Ma, Hans Rinderknecht, A. J. Mackinnon, R. Bionta, Maria Gatu-Johnson, A. Hamza, C. Wild, D. J. Erskine, J. R. Rygg, W. Hsing, S. Khan, G. Grim, B. Spears, A. G. MacPhee, R. Dylla-Spears, Alex Zylstra
Rok vydání:	2014
Předmět:	Physics Laser ablation Implosion chemistry.chemical_element Condensed Matter Physics law.invention Ignition system Deuterium chemistry Hohlraum law Neutron Atomic physics Inertial confinement fusion Helium
Zdroj:	Physics of Plasmas. 21:056318
ISSN:	1089-7674 1070-664X
DOI:	10.1063/1.4876611
Popis:	High Density Carbon (HDC) is a leading candidate as an ablator material for Inertial Confinement Fusion (ICF) capsules in x-ray (indirect) drive implosions. HDC has a higher density (3.5 g/cc) than plastic (CH, 1 g/cc), which results in a thinner ablator with a larger inner radius for a given capsule scale. This leads to higher x-ray absorption and shorter laser pulses compared to equivalent CH designs. This paper will describe a series of experiments carried out to examine the feasibility of using HDC as an ablator using both gas filled hohlraums and lower density, near vacuum hohlraums. These experiments have shown that deuterium (DD) and deuterium-tritium gas filled HDC capsules driven by a hohlraum filled with 1.2 mg/cc He gas, produce neutron yields a factor of 2× higher than equivalent CH implosions, representing better than 50% Yield-over-Clean (YoC). In a near vacuum hohlraum (He = 0.03 mg/cc) with 98% laser-to-hohlraum coupling, such a DD gas-filled capsule performed near 1D expectations. A cryogenic layered implosion version was consistent with a fuel velocity = 410 ± 20 km/s with no observed ablator mixing into the hot spot.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::3a48911503e8a6112ff3ae03e0a43618 https://doi.org/10.1063/1.4876611 Zobrazit plný text záznamu