Hard X-ray and hot electron environment in vacuum hohlraums at NIF

McDonald, J.; Suter, L. J.; Landen, O. L.; Foster, J. M.; Celeste, J.; Holder, J. P.; Dewald, E. L.; Schneider, M. B.; Hinkel, D. E.; Kauffman, R. L.; Atherton, L. J.; Bonanno, R. E.; Dixit, S.; Eder, David C.; Haynam, C.; Kalantar, D. H.; Koniges, Alice; Lee, F.D.; MacGowan, B. J.; Manes, Kenneth R.; Munro, D.H.; Murray, J. R.; Shaw, Michael J.; Stevenson, R. M.; Parham, T.; Wonterghem, B. M. Van; Wallace, R. J.; Wegner, Paul J.; Whitman, Pamela K.; Young, B. K.; Hammel, B. A.; Moses, E. I.

doi:10.1051/jp4:2006133062

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Extended Plamas-filling Model For Ellipraum1

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2012

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“…In our previous work , we extended the plasma-filling model (Dewald et al, 2005;McDonald et al, 2006;Schneider et al, 2006) to a case when a cylinraum is driven by a shaped laser pulse with high contrast (>1) between different steps, which is a typical drive for ignition goal. In the extended model, we assume that the differences of radiation temperature T r between steps are large and calculate the ablated mass of the wall in each step independently.…”

Section: Extended Plamas-filling Model For Ellipraummentioning

confidence: 99%

Initial study and design on ignition ellipraum

et al. 2012

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An initial study and design on ignition elliptical hohlraum (ellipraum) is given by using the expended plasma-filling model with criterions. As a result, in an ellipraum with a smaller ratio of major-to-minor axis (a/b), the radius ratio of ellipraumto-capsule (b/R C ) should be larger (hence more sphere-like) to meet the criterions of plasma-filling and laser deposition, meanwhile the required laser energy and peak power are lower and the coupling between different modes is weaker. To produce a 300 eV radiation pulse to ignite a capsule of 1 mm radius, an ellipraum of a/b = 1.6 and b/R c = 2.8 is superior to a cylinraum with a length-to-diameter ratio of 1.81 and a cylinraum-to-capsule radius ratio of 2.54 in saving more than 10% laser energy and reducing 50% coupling between different modes.

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Section: Extended Plamas-filling Model For Ellipraummentioning

confidence: 99%