Three-dimensional HYDRA simulations of National Ignition Facility targets

Marinak, M. M.; Kerbel, G. D.; Gentile, N. A.; Jones, O. S.; Munro, D. H.; Pollaine, S. M.; Dittrich, Thomas; Haan, S. W.

doi:10.1063/1.1356740

Cited by 665 publications

(339 citation statements)

References 34 publications

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“…All of the available diagnostics point to our perfect capsule simulations predicting implosions that are too compressible, causing the capsule to have yields that are too high. We ran 2-D Hydra [13] simulations of capsules with the correct laser imprint pattern versus one with spherically symmetric drive and found the laser imprinting reduced the yield by a factor of 2.5. If we multiply the Eulerian mix yield ratios by this amount, we would predict ratios between 0.5 and 0.7.…”

Section: Discussionmentioning

confidence: 99%

Analysis of mix experiments on Omega

Bradley

Cobble

Fincke

et al. 2013

EPJ Web of Conferences

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Section: Discussionmentioning

confidence: 99%

Analysis of mix experiments on Omega

Bradley

Cobble

Fincke

et al. 2013

EPJ Web of Conferences

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“…HYDRA [3] [2] is a multi-physics code that simulates a variety of experiments conducted at the National Ignition Facility (NIF) and other pulsed laser facilities. The laser deposits a large amount of energy in a small volume, so HY-DRA is focused on simulating the processes of high energy density physics.…”

Section: Hydra Characterizationmentioning

confidence: 99%

Performance Characteristics of HYDRA - a Multi-Physics simulation code from Lawrence Livermore National Laboratory

Langer

Karlin

Marinak

2014

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HYDRA is used to simulate a variety of experiments carried out at the National Ignition Facility (NIF) [4] and other high energy density physics facilities. HYDRA has packages to simulate radiation transfer, atomic physics, hydrodynamics, laser propagation, and a number of other physics effects. HYDRA has over one million lines of code and includes both MPI and thread-level (OpenMP and pthreads) parallelism.This paper measures the performance characteristics of HYDRA using hardware counters on an IBM BlueGene/Q system. We report key ratios such as bytes/instruction and memory bandwidth for several different physics packages. The total number of bytes read and written per time step is also reported. We show that none of the packages which use significant time are memory bandwidth limited on a Blue Gene/Q. HYDRA currently issues very few SIMD instructions. The pressure on memory bandwidth will increase if high levels of SIMD instructions can be achieved.

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“…However most of the current design emphasis in the ICF field is on minimizing laser and capsule size. [6][7][8] In such optically thin systems, radiation is predominantly a volume loss term with negligible reabsorption and negligible Compton scattering. Advanced designs, such as the fast ignition concept, [9][10][11] are intended to burn much more fuel mass, but still operate mostly as transparent to the emitted x rays.…”

Section: Introductionmentioning

confidence: 99%

Photon coupling theory for plasmas with strong Compton scattering: Four temperature theory

et al. 2009

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ARTICLES YOU MAY BE INTERESTED INStudy of the ion kinetic effects in ICF run-away burn using a quasi-1D hybrid model Physics of Plasmas 24, 022704 (2017) When an equimolar mixture of deuterium ͑D͒ and tritium ͑T͒ at high density undergoes fusion burn, the system becomes extremely nonequilibrium. The ion temperature rises much higher than the electron temperature which, in turn, is much higher than the radiation temperature. Accurately simulating this nonequilibrium burn process has previously required a multigroup representation of the radiation field. Although simulating this D-T burn with a simple three temperature model ͑3T͒ also results in significant departures from thermal equilibrium, the ion and electron temperature histories from the 3T simulations are much lower than from the multigroup simulations. In this paper, a theory that overcomes the deficiencies of the 3T model in simulating burn of high density D-T is developed. The primary deficiency of the 3T model for this physical system is with the treatment of the Compton scattering energy exchange. The theory here developed culminates in a four temperature model ͑4T͒ which describes the radiation field with two temperatures. These are T R , which is the standard radiation temperature of the 3T model ͑proportional to the fourth root of the radiation energy density͒, and T p , which is the true thermodynamic temperature of the photon distribution. This 4T theory gives excellent agreement with the multigroup model for the nonequilibrium burn of D-T. Further, the 4T model transitions smoothly to the 3T model when this is appropriate. Thus the kinetic theory derivation of the 4T model also provides a solid theoretical foundation for the 3T model. Extensions of the theory to inhomogeneous systems are under development to allow treatment of geometries where the computational efficiency of the 4T approach can convey a sizable advantage. There appear to be at least two important applications where the model can be applied. One is for inertial confinement fusion capsules that are optically thick and utilize volume ignition. The second application involves astrophysical accretion disks in the high temperature regime that also exhibit matter heating radiation, albeit without a fusion energy source. A reduced complexity radiation model with the associated reduced computer resource requirements has the potential to facilitate high resolution two dimensional and three dimensional simulations of these astrophysical objects.

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Three-dimensional HYDRA simulations of National Ignition Facility targets

Cited by 665 publications

References 34 publications

Analysis of mix experiments on Omega

Analysis of mix experiments on Omega

Performance Characteristics of HYDRA - a Multi-Physics simulation code from Lawrence Livermore National Laboratory

Photon coupling theory for plasmas with strong Compton scattering: Four temperature theory

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