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Your search keyword '"Datte, P."' showing total 2 results
Start Over Author "Datte, P." Topic shock waves
2 results on '"Datte, P."'

1. 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., and Döppner, T.

Subjects
DEUTERIUM, INTERFEROMETRY, SHOCK waves, HYDROGEN isotopes, DEUTERATION
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. [ABSTRACT FROM AUTHOR]

Published
2013
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2. Shock timing experiments on the National Ignition Facility: Initial results and comparison with simulation.

Author

Robey, H. F., Boehly, T. R., Celliers, P. M., Eggert, J. H., Hicks, D., Smith, R. F., Collins, R., Bowers, M. W., Krauter, K. G., Datte, P. S., Munro, D. H., Milovich, J. L., Jones, O. S., Michel, P. A., Thomas, C. A., Olson, R. E., Pollaine, S., Town, R. P. J., Haan, S., and Callahan, D.

Subjects
DEUTERIUM, TRITIUM, SHOCK waves, NUCLEAR fusion, COMPUTER simulation, FUEL, PLASMA gases
Abstract

Capsule implosions on the National Ignition Facility (NIF) [Lindl et al., Phys. Plasmas 11, 339 (2004)] are underway with the goal of compressing deuterium-tritium (DT) fuel to a sufficiently high areal density (ρR) to sustain a self-propagating burn wave required for fusion power gain greater than unity. These implosions are driven with a carefully tailored sequence of four shock waves that must be timed to very high precision in order to keep the DT fuel on a low adiabat. Initial experiments to measure the strength and relative timing of these shocks have been conducted on NIF in a specially designed surrogate target platform known as the keyhole target. This target geometry and the associated diagnostics are described in detail. The initial data are presented and compared with numerical simulations. As the primary goal of these experiments is to assess and minimize the adiabat in related DT implosions, a methodology is described for quantifying the adiabat from the shock velocity measurements. Results are contrasted between early experiments that exhibited very poor shock timing and subsequent experiments where a modified target geometry demonstrated significant improvement. [ABSTRACT FROM AUTHOR]

Published
2012
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