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TRANSP and PTRANSP: Status and Plans

Detailed overview of TRANSP capabilities, analysis methods, hardware, and future directions in fusion energy research. Presented at JET/MAST Users’ Meeting.

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TRANSP and PTRANSP: Status and Plans

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  1. TRANSP and PTRANSP: Status and Plans Presented at JET/MAST TRANSP Users’ Meeting, Sept. 19, 2007 D. McCune

  2. TRANSP: Vision Statement Provide a comprehensive end-to-end modeling capability for magnetic confinement fusion energy experiments of today and tomorrow. D. McCune

  3. Traditional TRANSP: Overview Experiments (Asdex-U, C-Mod, DIII-D, ITER, JET, KSTAR, MAST, NSTX) MDS+ 20-50 signals {f(t), f(x,t)} Plasma position, Shape, Temperatures, Densities Field, Current, RF and Beam Injected Powers. Preliminary data Analysis and Preparation (largely automated) Diagnostic Hardware Pre- and Post-processing at the experimental site… MDS+ TRANSP Analysis*: Current diffusion, MHD equilibrium, fast ions, heating, current drive; power, particle and momentum balance. Experiment simulation Output Database ~1000-2000 signals {f(t), f(x,t)} Visualization Load Relational Databases Detailed (3d) time-slice physics simulations: GS2, ORBIT, M3D… *FusionGrid TRANSP on PPPL servers D. McCune

  4. PPPL TRANSP team: Robert Andre Eliot Feibush Kumar Indireshkumar Jae-Min Kwon* Long-Poe Ku Christiane Ludescher Doug McCune Lew Randerson Paid mostly by NSTX & Collaboration projects. Also: SciDAC, PTRANSP. User Sites: Culham (MAST) GA (DIII-D) HL2A (China) IPP (Asdex-U) JET MIT (C-Mod) PPPL (NSTX) PPPL (Collaborations) TRANSP Developers and Users *KSTAR/NFRC visitor (returns to Korea Oct. 1) D. McCune

  5. PPPL TRANSP Run Production Fusion Grid TRANSP (SciDAC Collaboratory) D. McCune

  6. Major New TRANSP Features • Monte Carlo RF Operator (Jae-Min Kwon) • TORIC wave field solutions coupled to NUBEAM; • Two passes: after first pass orbits are recalculated with E+ renormalized to get power absorption right. • MPI-parallel TRANSP Server • Serial clients share server for 8- or 16-processor NUBEAM calculations. D. McCune

  7. Beam ion RF-power absorption match between NUBEAM and TORIC5 total RF-power from NUBEAM total RF-power from TORIC D. McCune

  8. RF-field renormalization constant for power match D. McCune

  9. Beam ion RF-power absorption profiles D. McCune

  10. Beam ion RF-power absorption profiles by NUBEAM and TORIC5 TORIC5 NUBEAM D. McCune

  11. NUBEAM RF Operator Issues • MPI runs needed for better statistics. • Wave code needs non-Maxwellian target distribution function. • NonMax version of TORIC exists. • Need to install and test in TRANSP. • Need to learn how to fit “noisy” MC-binned distribution function data in TORIC. • Extensive validation will be needed. D. McCune

  12. MPI-Parallel Module Server Serial TRANSP Run (Client #1) Input File* Package, e.g. XPLASMA** NetCDF state. Server Queue • MPI-Parallel TRANSP • Module Server(s): • NUBEAM monte carlo • TORIC5 full wave • GenRAY ray tracing • CQL3D fokker planck • GCNM transp. solver • ... … … Serial TRANSP Run (Client #2) Output File* Package, e.g. XPLASMA** NetCDF state. Serial TRANSP Run (Client #3) … *viability of method depends on keeping files small. Serial TRANSP Run (Client #N) **NTCC container module for equilibrium, profiles, distribution functions, etc. (http://w3.pppl.gov/NTCC) to be used for Fusion Simulation Project prototype and tested in TRANSP deployment. network D. McCune

  13. NUBEAM Parallel Server • In operation for “early volunteer” users. • Reliability and performance evaluation in progress. • Client server file communications overhead is significant: • Only large NPTCLS runs will benefit • We plan to evaluate a more traditional (no client-server) deployment for midrange runs. D. McCune

  14. More TRANSP Improvements • Incremental improvements to equilibrium: • TEQ somewhat more reliable for STs. • Some cases still fail. • “Equal Arc” poloidal angle option for LEVGEO=8 (scrunch2) runs. • NUBEAM deposition distribution function data: set OUTTIM(…) in namelist; use get_fbm on <runid>.DATAn output files. • ElVis RPLOT runs in web browser… D. McCune

  15. RPLOT and TRDAT in ElVis RPLOT session shown: Single window for plots. Command line i/o D. McCune

  16. Future Directions • More MPI services: TORIC, GENRAY,… • Better MHD equilibrium reconstruction • Continued improvement to Monte Carlo RF operator and wave code coupling. • More code development collaboration for more rapid progress. • PTRANSP… D. McCune

  17. TRANSP is Big Software • Source builds 219 executable programs • Sources for 199 subroutine libraries • 418 (219+199) directories containing F90, C, and C++ source code. • 26 directories of scripts and documents (not compiled). • 178 directories with changes in CY-2007. • 1.66 Mlines of source (w/comments); 1.13 Mlines of source (comments not counted). D. McCune

  18. Code Development is Feasible • Unified source code control (cvs server at PPPL). • Unified build system with makefile generator. • Precise control of contents of “debug” executables for code development. • Lehigh University physicist Glenn Bateman and student Federico Halpern acquired TRANSP code developer skills after one week visit to PPPL. D. McCune

  19. PTRANSP Phase 1 (2006 APS) • Stiff solver upgrades completed: • Free Boundary (TSC): L. P. Ku, JP1.00123 • Prescribed Boundary: G. Bateman, JP1.00126 • PTRANSP Client-Server Configuration: • TSC free boundary predictive code client: • Compute evolution of equilibrium and profiles; • TRANSP server: • Compute heating and current drive sources; • Standard analysis of predictive code results. • See JP1.00123. D. McCune

  20. The PTRANSP Coupled {Te,Ti} Temperature Solver Without linearization With linearization GLF-23 TSC solver method was ported into TRANSP by Lehigh U. Group; Extensive use in TRANSP for ITER Simulations by R. Budny & Lehigh U. team. D. McCune

  21. Phase 2: PTRANSP is TRANSP • A project to upgrade TRANSP predictive capability. • Retained from TRANSP: • Code base • Production system • Connection to experimental data • Connection to post-processors • Connection to user community. D. McCune

  22. PTRANSP Phase 2 • “non-renewable” 3 Year Grant, ~$650k/year • Funding approved late in FY-2007 • General Atomics (25%) • Lehigh University (25%) • LLNL (25%) • PPPL (25%). • Work scope of grant clearly focused on predictive upgrades to TRANSP itself. D. McCune

  23. PTRANSP Phase 2 – GA Role • Add GCNM-P Solver to TRANSP • Allow flexible applications: • Prescribe electron density (T/F) • Prescribe ion densities and impurity levels (T/F) • Include depletion by fast species. • Separately computed: MHD equilibrium and q(r,t). • Import TGLF predictive Transport Model into TRANSP via GCNM-P. • Likely to use SWIM Plasma State software. • Support other uses of TGLF as needed. D. McCune

  24. PTRANSP Phase 2 – Lehigh U. • Program of direct improvements to TRANSP internal solvers (with PPPL). • Predictive Sawtooth and Pedestal models. • Intensive use of PTRANSP for research applications. D. McCune

  25. PTRANSP Phase 2 -- LLNL • Provide Free Boundary TEQ model to PPPL. • Enhance TEQ to enable concurrent prediction of poloidal field diffusion and MHD equilibrium. • Additional TEQ enhancements (e.g. hyper-resistivity). D. McCune

  26. PTRANSP Phase 2 -- PPPL • Provide TRANSP system and development support to all participants. • Install the TEQ model upgrades provided by LLNL. • Place PTRANSP capabilities in production and trouble-shoot applications. • Provide additional TRANSP/PTRANSP upgrades as may be needed. D. McCune

  27. PTRANSP Focus on Plasma Core • True whole device predictive modeling requires validation with close coupling to: • Scrape-off Layer (Edge) Plasma Model. • Wall Model. • Many other things– SOL Atomic Physics, etc. • Current PTRANSP plans are short term. • Not high performance super-computing. • No true whole device predictive model. • Such capabilities require a much larger effort. • Fusion Simulation Project $24M/year…?? D. McCune

  28. Collaboration Opportunities • Improve TRANSP RF capabilities. • Improve PTRANSP capabilities: • Performance options (e.g. fast source models). • TGLF installation in TRANSP-native solver (when TGLF is available). • Significant commitment required for success: ~ 0.5 person-year / collaboration. D. McCune

  29. TRANSP Users’ Group at APS • Annual TRANSP Users’ Group Meeting. • Review/discuss (P)TRANSP status & plans. • Monday evening satellite meeting at APS. • This year: • Orlando, Florida APS-DPP conference. • Monday, Nov. 12, 8pm. • Apologies in advance for the inevitable schedule conflicts… D. McCune

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