The role of hot spot mix in the low-foot and high-foot implosions on the NIF

The role of hot spot mix in the low-foot and high-foot implosions on the NIF

Hydrodynamic mix of the ablator into the DT fuel layer and hot spot can be a critical performance limitation in inertial confinement fusion implosions. This mix results in increased radiation loss, cooling of the hot spot, and reduced neutron yield. To quantify the level of mix, we have developed a...

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Veröffentlicht in:Physics of plasmas 2017-05, Vol.24 (5)
Hauptverfasser: Ma, T., Patel, P. K., Izumi, N., Springer, P. T., Key, M. H., Atherton, L. J., Barrios, M. A., Benedetti, L. R., Bionta, R., Bond, E., Bradley, D. K., Caggiano, J., Callahan, D. A., Casey, D. T., Celliers, P. M., Cerjan, C. J., Church, J. A., Clark, D. S., Dewald, E. L., Dittrich, T. R., Dixit, S. N., Döppner, T., Dylla-Spears, R., Edgell, D. H., Epstein, R., Field, J., Fittinghoff, D. N., Frenje, J. A., Gatu Johnson, M., Glenn, S., Glenzer, S. H., Grim, G., Guler, N., Haan, S. W., Hammel, B. A., Hatarik, R., Herrmann, H. W., Hicks, D., Hinkel, D. E., Berzak Hopkins, L. F., Hsing, W. W., Hurricane, O. A., Jones, O. S., Kauffman, R., Khan, S. F., Kilkenny, J. D., Kline, J. L., Kozioziemski, B., Kritcher, A., Kyrala, G. A., Landen, O. L., Lindl, J. D., Le Pape, S., MacGowan, B. J., Mackinnon, A. J., MacPhee, A. G., Meezan, N. B., Merrill, F. E., Moody, J. D., Moses, E. I., Nagel, S. R., Nikroo, A., Pak, A., Parham, T., Park, H.-S., Ralph, J. E., Regan, S. P., Remington, B. A., Robey, H. F., Rosen, M. D., Rygg, J. R., Ross, J. S., Salmonson, J. D., Sater, J., Sayre, D., Schneider, M. B., Shaughnessy, D., Sio, H., Spears, B. K., Smalyuk, V., Suter, L. J., Tommasini, R., Town, R. P. J., Volegov, P. L., Wan, A., Weber, S. V., Widmann, K., Wilde, C. H., Yeamans, C., Edwards, M. J.
Format: Artikel
Sprache:eng
Schlagworte:
70 PLASMA PHYSICS AND FUSION
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
Ablation
ENGINEERING
Implosions
Inertial confinement fusion
Plasma physics
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Zusammenfassung:Hydrodynamic mix of the ablator into the DT fuel layer and hot spot can be a critical performance limitation in inertial confinement fusion implosions. This mix results in increased radiation loss, cooling of the hot spot, and reduced neutron yield. To quantify the level of mix, we have developed a simple model that infers the level of contamination using the ratio of the measured x-ray emission to the neutron yield. The principal source for the performance limitation of the “low-foot” class of implosions appears to have been mix. Lower convergence “high-foot” implosions are found to be less susceptible to mix, allowing velocities of >380 km/s to be achieved.
ISSN:1070-664X
1089-7674
DOI:10.1063/1.4983625