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Your search keyword '"Hamza, A.V."' showing total 2 results
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2 results on '"Hamza, A.V."'

1. Shock timing on the National Ignition Facility: The first precision tuning series

Author

Robey H.F., Celliers P.M., Kline J.L., Mackinnon A.J., Boehly T.R., Landen O.L., Eggert J.H., Hicks D., Pape S. Le, Farley D.R., Bowers M.W., Krauter K.G., Munro D.H., Jones O.S., Milovich J.L., Clark D., Spears B.K., Town R.P. J., Haan S. W., Dixit S., Schneider M.B., Dewald E.L., Widmann K., Moody J.D., Döppner T., Radousky H.B., Nikroo A., Kroll J.J., Hamza A.V., Horner J.B., Bhandarkar S.D., Dzenitis E., Alger E., Giraldez E., Castro C., Moreno K., Haynam C., LaFortune K.N., Widmayer C., Shaw M., Jancaitis K., Parham T., Holunga D.M., Walters C.F., Haid B., Malsbury T., Trummer D., Coffee K.R., Burr B., Berzins L.V., Choate C., Brereton S.J., Azevedo S., Chandrasekaran H., Glenzer S., Caggiano J.A., Knauer J.P., Frenje J.A., Casey D.T., Johnson M. Gatu, Séguin F. H., Young B.K., Edwards M.J., Wonterghem B.M. Van, Kilkenny J., MacGowan B.J., Atherton L.J., Lindl J.D., Meyerhofer D.D., and Moses E.

Subjects
Physics, QC1-999
Abstract

Ignition implosions on the National Ignition Facility (NIF) [Lindl et al., Phys. Plasmas 11, 339 (2004)] are driven with a very carefully tailored sequence of four shock waves that must be timed to very high precision in order to keep the fuel on a low adiabat. The first series of precision tuning experiments on NIF have been performed. These experiments use optical diagnostics to directly measure the strength and timing of all four shocks inside the hohlraum-driven, cryogenic deuterium-filled capsule interior. The results of these experiments are presented demonstrating a significant decrease in the fuel adiabat over previously un-tuned implosions. The impact of the improved adiabat on fuel compression is confirmed in related deuterium-tritium (DT) layered capsule implosions by measurement of fuel areal density (ρR), which show the highest fuel compression (ρR ∼ 1.0 g/cm2) measured to date.

Published
2013
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2. Shock timing on the National Ignition Facility: First experiments

Author

Celliers P.M., Robey H.F., Boehly T.R., Alger E., Azevedo S., Berzins L.V., Bhandarkar S.D., Bowers M.W., Brereton S.J., Callahan D., Castro C., Chandrasekaran H., Choate C., Clark D.S., Coffee K.R., Datte P.S., Dewald E.L., DiNicola P., Dixit S., Döppner T., Dzenitis E., Edwards M.J., Eggert J.H., Fair J., Farley D.R., Frieders G., Gibson C.R., Giraldez E., Haan S., Haid B., Hamza A.V., Haynam C., Hicks D.G., Holunga D.M., Horner J.B., Jancaitis K., Jones O.S., Kalantar D., Kline J.L., Krauter K.G., Kroll J.J., LaFortune K.N., Pape S. Le, Malsbury T., Mapoles E.R., Meezan N.B., Milovich J.L., Moody J.D., Moreno K., Munro D.H., Nikroo A., Olson R.E., Parham T., Pollaine S., Radousky H.B., Ross G.F., Sater J., Schneider M.B., Shaw M., Smith R.F., Sterne P.A., Thomas C.A., Throop A., Town R.P.J., Trummer D., Wonterghem B.M. Van, Walters C.F., Widmann K., Widmayer C., Young B.K., Atherton L.J., Collins G.W., Landen O.L., Lindl J.D., MacGowan B.J., Meyerhofer D.D., and Moses E.I.

Subjects
Physics, QC1-999
Abstract

An experimental campaign to tune the initial shock compression sequence of capsule implosions on the National Ignition Facility (NIF) was initiated in late 2010. The experiments use a NIF ignition-scale hohlraum and capsule that employs a re-entrant cone to provide optical access to the shocks as they propagate in the liquid deuterium-filled capsule interior. The strength and timing of the shock sequence is diagnosed with velocity interferometry that provides target performance data used to set the pulse shape for ignition capsule implosions that follow. From the start, these measurements yielded significant new information on target performance, leading to improvements in the target design. We describe the results and interpretation of the initial tuning experiments.

Published
2013
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