Effect of NLTE Emissivity Models on NIF Ignition Hohlraum Power Requirements

Journal Article · Thu Sep 10 00:00:00 EDT 2009 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3241207· OSTI ID:21344629

Suter, L; Rosen, M; Springer, P; Haan, S ^[1]; Hansen, S ^[1]

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1. Lawrence Livermore National Laboratory, Livermore, CA (United States)

NLTE atomic physics model can significantly affect the power requirements and plasma conditions in ignition hohlraums. This is because the emissivity is a significant factor in determining the time dependent coronal temperature of the hot blow-off plasma filling ignition hohlraums, which, in turn, determines the total energy stored in that coronal plasma at any instant. Here we present best estimates of NLTE emissivity using the SCRAM model, including the range of uncertainty, and compare them with the emissivity of the model used to design NIF ignition hohlraums and set the NIF pulse shape, XSN NLTE. We then present pulse shapes derived from hohlraum simulations using an atomic physics model that approximates the SCRAM emissivities. We discuss the differences in coronal energetics and show how this affects the pulse shape and, in particular, the peak power requirement.

• OSTI ID: 21344629
• Journal Information: AIP Conference Proceedings, Vol. 1161, Issue 1; Conference: 16. international conference on atomic processes in plasmas, Monterey, CA (United States), 22-26 Mar 2009; Other Information: DOI: 10.1063/1.3241207; (c) 2009 American Institute of Physics; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
COMPARATIVE EVALUATIONS
COMPUTERIZED SIMULATION
ELECTRON TEMPERATURE
EMISSIVITY
HYDRODYNAMICS
ION TEMPERATURE
LASER-PRODUCED PLASMA
PLASMA PRODUCTION
PLASMA SIMULATION
S CODES
THERMONUCLEAR IGNITION
TIME DEPENDENCE
US NATIONAL IGNITION FACILITY
COMPUTER CODES
EVALUATION
FLUID MECHANICS
MECHANICS
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
PLASMA
SIMULATION
SURFACE PROPERTIES