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FACETS: Framework Application for Core-Edge Transport Simulations

FACETS is a framework application designed to include increasingly sophisticated models for fusion confinement devices. It provides computational capabilities for core-edge-wall integration and aims to make an impact on ITER and other fusion machines.

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FACETS: Framework Application for Core-Edge Transport Simulations

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  1. FACETS: Framework Application for Core-Edge Transport Simulations J. R. Cary Tech-X Corporation https://www.facetsproject.org/facets

  2. FACETS: Framework Application for Core-Edge Transport Simulations Framework application: an application designed to allow a series of computations with ever increasing fidelity and, therefore, to include successively more sophisticated models, in particular of each of the aspects of a fusion confinement device. In-reach: Fang (Cherry) Liu, Bramley/IU, Dist components Mahmood Miah, Jardin/PPPL, MHD Eq.

  3. FACETS background • Part of SciDAC portfolio of the Office of Fusion Energy Sciences • Proposed in April, 2006 • Funded January 1, 2007 • Multi-institutional main project: Tech-X (Physics, CS/AM), LLNL (Physics, CS/AM), PPPL (Physics), ANL (CS/AM), UCSD (Physics), CSU (AM), ORNL (CS, perf), ParaTools (CS, perf) • Appended SAP: GA, ORNL • Advisory: Columbia, LBNL, IU, MIT, NYU, Lodestar • In collaboration with the CETs: TOPS, TASCS, VACET PSCAI, PPPL, 8 Jun 07

  4. FACETS goals • Provide coupled core-edge-wall computational capability to the fusion community • At various levels of detail • Serial and parallel • Make impact on ITER and existing/new machines • Device selection (heating) • Scenario development • Operation • Analysis • Maximal reuse of existing (legacy) software • Take advantage of petascale computing facilities: a priori parallel • Have FACETS broadly installed and in use (move beyond “users = developers”) PSCAI, PPPL, 8 Jun 07

  5. Core-edge-wall integration involves multiple dimensionalities Closed field lines: slow perpendicular + fast parallel transport Quantities 1-D Hot plasma Collisionless, no significant atomic physics (except beams)  Open field lines: so parallel transport must balance perpendicular Quantities are 2-D Cool plasma Collisional, atomic physics is important Plasma-wall interaction is 2-D PSCAI, PPPL, 8 Jun 07

  6. Idealized view: Surfacial couplings between phase transitions • Core is a collisionless, 1-D transport system with local, only-cross-surface fluxes. • Edge is a collisional, 2-D transport system. • Wall: beginning of a particle trapping matrix. Surfacial couplings Wall Same points Coupling PSCAI, PPPL, 8 Jun 07

  7. Justification for core-edge coupling needs matching • Sufficiently inside the last closed flux surface, 2-D effects are small. • Moving out, plasma becomes more collisional. • Both approximations exist—allows matching. Basis requires matching theory single point magnetically Separation represents 1/parallel transport PSCAI, PPPL, 8 Jun 07

  8. FRAMEWORK: Layering set packages not dependent on their layer or higher fctest regression tests fcunit Unit tests facets main Invocation fctrol overall container and control Control Implementation Transport Equilib Edge Wall IO Comm Data and interaction fcifcs fusion objects, interactions, access external phys, slv NUBEAM,UEDGE external util MPI, HDF5, fcstd fusion independent objects Tools stdc++, txbase containers PSCAI, PPPL, 8 Jun 07

  9. Contacts • John R. Cary • Tech-X Corporation(303) 448-0728 • cary@txcorp.com • J. A. Kuehn • Future Technologies GroupComputer Science and MathematicsOak Ridge National Laboratory • (865) 241-6134 • kuehn@ornl.gov 9 Cary_FACETS_SC07

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