Integrated fusion simulation with self-consistent core-pedestal coupling

Meneghini, O.; Snyder, P. B.; Smith, S. P.; Candy, J.; Staebler, G. M.; Belli, E. A.; Lao, L. L.; Park, J. M.; Green, D. L.; Elwasif, W.; Grierson, B. A.; Holland, C.

doi:10.1063/1.4947204

Title: Integrated fusion simulation with self-consistent core-pedestal coupling

Journal Article · Wed Apr 20 00:00:00 EDT 2016 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4947204· OSTI ID:1319224

Meneghini, O. ^[1]; Snyder, P. B. ^[1]; Smith, S. P. ^[1]; Candy, J. ^[1];

^[1];

^[1]; Lao, L. L. ^[1]; Park, J. M. ^[2]; Green, D. L. ^[2];

^[2]; Grierson, B. A. ^[3]; Holland, C. ^[4]

General Atomics, San Diego, CA (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Univ. of California, San Diego, CA (United States)

Accurate predictions of fusion performance requires including the strong interplay that exists between core transport, pedestal structure, current profile and plasma equilibrium. An integrated modeling workflow capable of finding the steady-state self-consistent solution to this strongly coupled problem has been developed. The workflow, leverages first principles calculations and does not require prior knowledge of the kinetic profiles. Validation against DIII-D discharges shows that the workflow is capable of robustly predicting the kinetic profiles (electron and ion temperature and electron density) from the axis to the separatrix in agreement with the experiments. Results of a self-consistent optimization of the 15 MA D-T ITER baseline scenario show that controlling the pedestal density and impurity content during ITER operations will be critical to achieve high fusion performance while satisfying the requirements imposed by the density-limit. Further, we developed two neural-network (NN) based models as a means to perform a non-linear multivariate regression of theory-based models for the core transport fluxes, as well as for the pedestal structure. Specifically, we find that a NN-based approach can be used to consistently reproduce the results of the TGLF and EPED1 theory-based models over a broad range of plasma regimes, and with a computational speedup of several orders of magnitudes. The coupled core-pedestal workflow using these NN-accelerated models has been validated against a large database of DIII-D discharges, showing overall excellent agreement and performance. The NN paradigm is capable of breaking the speed-accuracy tradeoff that is expected of traditional numerical models, and can provide the missing link towards self-consistent coupled core-pedestal WDM simulations that are physically accurate and yet take only seconds to run.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); General Atomics, San Diego, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC05-00OR22725; FC02-06ER54873; AC02-05CH11231; FC02-04ER54698; FG02-95ER54309; SC0012633; SC0012656

OSTI ID:: 1319224

Alternate ID(s):: OSTI ID: 1248239; OSTI ID: 1372261; OSTI ID: 1489411

Journal Information:: Physics of Plasmas, Vol. 23, Issue 4; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 48 works

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