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Advances in NLTE Modeling for Integrated Simulations
Howard A. Scott,Stephanie Hansen,Stephanie Hansen +2 more
- Vol. 6
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TLDR
In this paper, a simple screened-hydrogenic model was proposed to calculate ionization balance with surprising accuracy, at a low enough computational cost for routine use in radiation-hydrodynamics codes.Abstract:
The last few years have seen significant progress in constructing the atomic models required for non-local thermodynamic equilibrium (NLTE) simulations. Along with this has come an increased understanding of the requirements for accurately modeling the ionization balance, energy content and radiative properties of different elements for a wide range of densities and temperatures. Much of this progress is the result of a series of workshops dedicated to comparing the results from different codes and computational approaches applied to a series of test problems. The results of these workshops emphasized the importance of atomic model completeness, especially in doubly excited states and autoionization transitions, to calculating ionization balance, and the importance of accurate, detailed atomic data to producing reliable spectra. We describe a simple screened-hydrogenic model that calculates NLTE ionization balance with surprising accuracy, at a low enough computational cost for routine use in radiation-hydrodynamics codes. The model incorporates term splitting, {Delta}n = 0 transitions, and approximate UTA widths for spectral calculations, with results comparable to those of much more detailed codes. Simulations done with this model have been increasingly successful at matching experimental data for laser-driven systems and hohlraums. Accurate and efficient atomic models are just one requirement for integrated NLTE simulations. Coupling the atomic kinetics to hydrodynamics and radiation transport constrains both discretizations and algorithms to retain energy conservation, accuracy and stability. In particular, the strong coupling between radiation and populations can require either very short timesteps or significantly modified radiation transport algorithms to account for NLTE material response. Considerations such as these continue to provide challenges for NLTE simulations.read more
Citations
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Journal ArticleDOI
Review of the National Ignition Campaign 2009-2012
TL;DR: The National Ignition Campaign (NIC) as mentioned in this paper was a multi-institution effort established under the National Nuclear Security Administration of DOE in 2005, prior to the completion of the NIF in 2009.
Point Design Targets, Specifications, and Requirements for the 2010 Ignition Campaign on the National Ignition Facility
S. W. Haan,J. D. Lindl,Debra Callahan,David J. Clark,Jay D. Salmonson,B. A. Hammel,J. Atherton,Robert Cook,J. Edwards,Siegfried Glenzer,A. V. Hamza,S. P. Hatchett,D. E. Hinkel,Darwin Ho,O. S. Jones,Otto Landen,B. J. MacGowan,M. M. Marinak,Edward I. Moses,D. H. Munro,S. M. Pollaine,Brian Spears,P. T. Springer,L. J. Suter,Cliff Thomas,Richard Town,S. V. Weber,Doug Wilson,G. A. Kyrala,Mark Herrmann,R. E. Olson,Roger Alan Vesey,A. Nikroo,W Huang,K. A. Moreno +34 more
Journal ArticleDOI
Progress Towards Ignition on the National Ignition Facility
M. J. Edwards,P. K. Patel,J. D. Lindl,L. J. Atherton,Siegfried Glenzer,S. W. Haan,J. D. Kilkenny,O. L. Landen,Edward I. Moses,A. Nikroo,R. D. Petrasso,T. C. Sangster,P. T. Springer,Steven H. Batha,R. Benedetti,L. A. Bernstein,Riccardo Betti,D. L. Bleuel,T. R. Boehly,D. K. Bradley,J. A. Caggiano,D. A. Callahan,P. M. Celliers,C. J. Cerjan,K. C. Chen,Daniel Clark,Gilbert Collins,E. L. Dewald,Laurent Divol,S. N. Dixit,Tilo Doeppner,D. H. Edgell,James E. Fair,Michael Farrell,R. J. Fortner,Johan Frenje,M. Gatu Johnson,E. M. Giraldez,V. Yu. Glebov,Gary Grim,B. A. Hammel,A. V. Hamza,D. R. Harding,S. P. Hatchett,N. Hein,Hans W. Herrmann,Damien Hicks,D. E. Hinkel,M. Hoppe,W. W. Hsing,Nobuhiko Izumi,B. Jacoby,O. S. Jones,Daniel H. Kalantar,Robert L. Kauffman,John Kline,J. P. Knauer,J. A. Koch,B. J. Kozioziemski,G. A. Kyrala,K. N. LaFortune,S. Le Pape,R. J. Leeper,R. A. Lerche,T. Ma,B. J. MacGowan,A. J. Mackinnon,Andrew MacPhee,Evan Mapoles,M. M. Marinak,M. Mauldin,P. W. McKenty,M. Meezan,Pierre Michel,Jose Milovich,J. D. Moody,Matthew Moran,D. H. Munro,C. L. Olson,Kathy Opachich,Art Pak,T. G. Parham,H.-S. Park,Joseph Ralph,Sean Regan,Bruce Remington,H. G. Rinderknecht,Harry Robey,M. D. Rosen,Steven Ross,Jay D. Salmonson,J. D. Sater,D. H. Schneider,Fredrick Seguin,Scott Sepke,D. A. Shaughnessy,V. A. Smalyuk,Brian Spears,Christian Stoeckl,Wolfgang Stoeffl,L. J. Suter,Cliff Thomas,R. Tommasini,Richard Town,S. V. Weber,Paul J. Wegner,K. Widman,Mark D. Wilke,Doug Wilson,Charles Yeamans,Alex Zylstra +110 more
TL;DR: In this paper, a low-Z capsule filled with deuterium-tritium (DT) fuel via laser indirect-drive inertial confinement fusion and demonstrate fusion ignition and propagating thermonuclear burn with a net energy gain of ∼5-10 (fusion yield/input laser energy).
The Role of a Detailed Configuration Accounting (DCA) Atomic Physics Package in Explaing the Energy Balance in Ignition Scale Hohlraums
M Rosen,H Scott,D. Hinkel,E. Williams,D. A. Callahan,R Town,L Divol,P Michel,W L Kruer,L. J. Suter,R London,J Harte,G Zimmerman +12 more
TL;DR: The High Flux Model (HFM) was used in the National Ignition Campaign (NIC) gas-filled/capsule-imploding hohlraum energetics campaign as discussed by the authors.
Journal ArticleDOI
Shock timing experiments on the National Ignition Facility: Initial results and comparison with simulation
Harry Robey,T. R. Boehly,Peter M. Celliers,Jon Eggert,Damien Hicks,Raymond F. Smith,R. Collins,Mark W. Bowers,K. G. Krauter,P. Datte,D. H. Munro,Jose Milovich,O. S. Jones,Pierre Michel,Cliff Thomas,R. E. Olson,S. M. Pollaine,Richard Town,S. W. Haan,Debra Callahan,David C. Clark,J. Edwards,John Kline,S. N. Dixit,Marilyn Schneider,E. L. Dewald,Klaus Widmann,J. D. Moody,Tilo Döppner,Harry B. Radousky,A Throop,Daniel H. Kalantar,P. DiNicola,A. Nikroo,Jeremy Kroll,A. V. Hamza,J. B. Horner,Suhas Bhandarkar,E. G. Dzenitis,E T Alger,E. M. Giraldez,Carlos E. Castro,K. A. Moreno,C. A. Haynam,K. N. LaFortune,C. C. Widmayer,M. J. Shaw,Kenneth S. Jancaitis,T. G. Parham,D. M. Holunga,C. F. Walters,B. Haid,Evan Mapoles,J. D. Sater,C. R. Gibson,T. N. Malsbury,James E. Fair,D. Trummer,K. R. Coffee,B. Burr,L. V. Berzins,C. Choate,S. J. Brereton,S. Azevedo,H. Chandrasekaran,David C. Eder,N. Masters,Aaron Fisher,P. A. Sterne,B. K. Young,Otto Landen,B. M. Van Wonterghem,B. J. MacGowan,J. Atherton,J. D. Lindl,D. D. Meyerhofer,Edward I. Moses +76 more
TL;DR: Lindl et al. as mentioned in this paper measured the strength and relative timing of deuterium-tritium (DT) implosions on the National Ignition Facility (NIF) in a specially designed target platform known as the keyhole target.
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