Initial MCNP6 Release Overview - MCNP6 Beta 3

Goorley, John T.; James, Michael R.; Booth, Thomas E.; Brown, Forrest B.; Bull, Jeffrey S.; Cox, L. J.; Durkee, Joe W.; Elson, Jay S.; Fensin, Michael L; Forster, Robert; Hendricks, John S.; Hughes, H.G.; Johns, Russell C.; Kiedrowski, Brian C.; Martz, Roger L.; Mashnik, S. G.; McKinney, G.W.; Pelowitz, Denise B.; Prael, R.E.; Sweezy, Jeremy; Waters, L.; Wilcox, Trevor; Zukaitis, Anthony J.

doi:10.2172/1056525

Cited by 20 publications

(52 citation statements)

References 20 publications

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“…While many other mature Monte Carlo codes exist, such as MCNP [98] or FLUKA [99], Geant4 has three unique advantages over other codes. First, it alone contains extensive optical physics modeling, which is now augmented by the new scintillation model presented in Section 5.2.…”

Section: Overview Of Acronymmentioning

confidence: 99%

An in situ accelerator-based diagnostic for plasma-material interactions science on magnetic fusion devices

Hartwig

Barnard

Lanza

et al. 2013

Review of Scientific Instruments

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Plasma-material interactions (PMI) in magnetic fusion devices such as fuel retention, material erosion and redeposition, and material mixing present significant scientific and engineering challenges, particularly for the next generation of devices that will move towards reactor-relevant conditions. Achieving an integrated understanding of PMI, however, is severely hindered by a dearth of in-situ diagnosis of the plasma-facing component (PFC) surfaces. To address this critical need, this thesis presents an accelerator-based diagnostic that nondestructively measures the evolution of PFC surfaces in-situ. The diagnostic aims to remotely generate isotopic concentration maps that cover a large fraction of the PFC surfaces on a plasma shot-to-shot timescale.The diagnostic uses a compact, high-current radio-frequency quadrupole accelerator to inject 0.9 MeV deuterons into the Alcator C-Mod tokamak. The tokamak magnetic fields in between plasma shots are used to steer the deuterons to PFCs where the deuterons cause high-Q nuclear reactions with low-Z isotopes ~5 pim into the material. Scintillation detectors measure the induced neutrons and gammas; energy spectra analysis provides quantitative reconstruction of surface concentrations. An overview of the diagnostic technique, known as accelerator-based in-situ materials surveillance (AIMS), and the first AIMS diagnostic on the Alcator C-Mod is given; a description of the complementary simulation tools is also provided. Experimental validation is shown to demonstrate the optimized beam injection into the tokamak, the quantification of PFC surfaces isotopes, and the measurement localization provided by magnetic beam steering. Finally, the first AIMS measurements of fusion fuel retention are presented, demonstrating the local erosion and codeposition of deuterium-saturated boron surface filns. The finding confirms that deuterium codeposition with boron is insufficient to account for the net fuel retention in Alcator C-Mod.

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Section: Overview Of Acronymmentioning

confidence: 99%

An in situ accelerator-based diagnostic for plasma-material interactions science on magnetic fusion devices

Hartwig

Barnard

Lanza

et al. 2013

Review of Scientific Instruments

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“…The easiest way to calculate with MCNP6 the absolute values of spectra of ejectiles and/or yields of reaction products is by using its so-called GENXS option (e.g. [1,87]). Previously, double differential cross sections of ejectiles could be calculated by MCNP6 using the GENXS option only for elementary particles and very light fragments up to 4 He.…”

Section: Implementation Into Mcnp6mentioning

confidence: 99%

“…The Los Alamos National Laboratory (LANL) MonteCarlo N-particle transport code MCNP6 [1] uses by default the latest version of the cascade-exciton model (CEM), CEM03.03 [2][3][4], as its event generator to simulate reactions induced by nucleons, pions, and photons of energies up to 4.5 GeV and the Los Alamos version of the quark-gluon string model (LAQGSM), LAQGSM03.03 [4][5][6], to simulate such reactions at higher energies, as well as reactions induced by other elementary particles and by nuclei of all energies up to ∼ 1 TeV/nucleon.…”

Section: Introductionmentioning

confidence: 99%

“…At lower energies, MCNP6 uses tables of evaluated nuclear data (referred to as "data libraries"), while for higher energies (> 150 MeV), MCNP6 uses CEM03.03 and LAQGSM03.03 as mentioned above, as well as by default for some reactions, or when chosen by users, the Bertini intranuclear cascade (INC) [7], ISABEL [8], or the INC developed at Liege (INCL) by Cugnon and colleagues from CEA/Saclay, France, version INCL4.2 [9], merged with the evaporation/fission and Fermi break-up models available in MCNP6 (see details in [1]). Emission of energetic heavy clusters from nuclear reactions plays a critical role in several applications, including electronics performance in space, human radiation dosages in space or other extreme radiation environments, proton and heavy-ion therapy in cancer treatment, accelerator and shielding applications, and more.…”

Section: Introductionmentioning

confidence: 99%

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Production of energetic light fragments in extensions of the CEM and LAQGSM event generators of the Monte Carlo transport code MCNP6

et al. 2017

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We extend the cascade-exciton model (CEM), and the Los Alamos version of the quark-gluon string model (LAQGSM), event generators of the Monte-Carlo N-particle transport code version 6 (MCNP6), to describe production of energetic light fragments (LF) heavier than 4 He from various nuclear reactions induced by particles and nuclei at energies up to about 1 TeV/nucleon. In these models, energetic LF can be produced via Fermi break-up, preequilibrium emission, and coalescence of cascade particles. Initially, we study several variations of the Fermi break-up model and choose the best option for these models. Then, we extend the modified exciton model (MEM) used by these codes to account for a possibility of multiple emission of up to 66 types of particles and LF (up to 28 Mg) at the preequilibrium stage of reactions. Then, we expand the coalescence model to allow coalescence of LF from nucleons emitted at the intranuclear cascade stage of reactions and from lighter clusters, up to fragments with mass numbers A ≤ 7, in the case of CEM, and A ≤ 12, in the case of LAQGSM. Next, we modify MCNP6 to allow calculating and outputting spectra of LF and heavier products with arbitrary mass and charge numbers. The improved version of CEM is implemented into MCNP6. Finally, we test the improved versions of CEM, LAQGSM, and MCNP6 on a variety of measured nuclear reactions. The modified codes give an improved description of energetic LF from particle-and nucleus-induced reactions; showing a good agreement with a variety of available experimental data. They have an improved predictive power compared to the previous versions and can be used as reliable tools in simulating applications involving such types of reactions.

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“…The Los Alamos Monte Carlo transport code MCNP6 [1] has recently benefitted from significant work to improve the photon-electron transport and atomic relaxation capabilities of the code. The improvements [2][3] include extension of existing photon data to lower energies than previously supported; addition of new data such as subshell-specific photoelectric cross sections; completion of the incoherent and coherent form factor data to cover all scattering angles at all supported energies; new data for electron interactions including bremsstrahlung, elastic scattering, subshell-specific electroionization, and atomic excitation; a much more detailed representation for atomic relaxation; and an entirely new (to MCNP) approach to electron transport: the single-event method [4].…”

Section: Introductionmentioning

confidence: 99%

Improvements in electron-photon-relaxation data for MCNP6

Hughes

2017

EPJ Web Conf.

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Abstract. After the initial release of the first production version of MCNP6 and its subsequent beta release, the extended electron-photon-relaxation capabilities of the code have continued to be developed. With the availability of newer data, several enhancements and corrections to the methods have been installed into the code. In this paper we discuss these improvements, including the development of three distinct approaches to sampling electron elastic scattering, the correction of an earlier data resolution problem, and a few formal corrections to the earlier ACE data file.

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Initial MCNP6 Release Overview - MCNP6 Beta 3

Cited by 20 publications

References 20 publications

An in situ accelerator-based diagnostic for plasma-material interactions science on magnetic fusion devices

An in situ accelerator-based diagnostic for plasma-material interactions science on magnetic fusion devices

Production of energetic light fragments in extensions of the CEM and LAQGSM event generators of the Monte Carlo transport code MCNP6

Improvements in electron-photon-relaxation data for MCNP6

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