Sept. 19, 2007D. McCune1 TRANSP and PTRANSP: Status and Plans Presented at JET/MAST TRANSP Users’ Meeting, Sept. 19, 2007

D. McCune2 TRANSP: Vision Statement Provide a comprehensive end-to-end modeling capability for magnetic confinement fusion energy experiments of today and tomorrow.

Sept. 19, 2007D. McCune3 Traditional TRANSP: Overview Preliminary data Analysis and Preparation (largely automated) Diagnostic Hardware Experiments (Asdex-U, C-Mod, DIII-D, ITER, JET, KSTAR, MAST, NSTX) signals {f(t), f(x,t)} Plasma position, Shape, Temperatures, Densities Field, Current, RF and Beam Injected Powers. TRANSP Analysis*: Current diffusion, MHD equilibrium, fast ions, heating, current drive; power, particle and momentum balance. Experiment simulation Output Database ~ signals {f(t), f(x,t)} Visualization Load Relational Databases Detailed (3d) time-slice physics simulations: GS2, ORBIT, M3D… *FusionGrid TRANSP on PPPL servers Pre- and Post-processing at the experimental site… MDS+

Sept. 19, 2007D. McCune4 TRANSP Developers and Users 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) *KSTAR/NFRC visitor (returns to Korea Oct. 1)

Sept. 19, 2007D. McCune5 PPPL TRANSP Run Production Fusion Grid TRANSP (SciDAC Collaboratory)

Sept. 19, 2007D. McCune6 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.

Sept. 19, 2007D. McCune7 Beam ion RF-power absorption match between NUBEAM and TORIC5 total RF-power from NUBEAM total RF-power from TORIC

Sept. 19, 2007D. McCune8 RF-field renormalization constant for power match

Sept. 19, 2007D. McCune9 Beam ion RF-power absorption profiles

Sept. 19, 2007D. McCune10 TORIC5NUBEAM Beam ion RF-power absorption profiles by NUBEAM and TORIC5

Sept. 19, 2007D. McCune11 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.

Sept. 19, 2007D. McCune12 MPI-Parallel Module Server Serial TRANSP Run (Client #1) Serial TRANSP Run (Client #2) Serial TRANSP Run (Client #N) Serial TRANSP Run (Client #3) … Input File* Package, e.g. XPLASMA** NetCDF state. Output 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... … … **NTCC container module for equilibrium, profiles, distribution functions, etc. ( to be used for Fusion Simulation Project prototype and tested in TRANSP deployment. *viability of method depends on keeping files small. network

Sept. 19, 2007D. McCune13 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.

Sept. 19, 2007D. McCune14 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.DATAn output files. ElVis RPLOT runs in web browser…

Sept. 19, 2007D. McCune15 RPLOT and TRDAT in ElVis Single window for plots.Command line i/o RPLOT session shown:

Sept. 19, 2007D. McCune16 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…

Sept. 19, 2007D. McCune17 TRANSP is Big Software Source builds 219 executable programs Sources for 199 subroutine libraries 418 ( ) directories containing F90, C, and C++ source code. 26 directories of scripts and documents (not compiled). 178 directories with changes in CY Mlines of source (w/comments); 1.13 Mlines of source (comments not counted).

Sept. 19, 2007D. McCune18 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.

Sept. 19, 2007D. McCune19 PTRANSP PTRANSP Phase 1 (2006 APS) Stiff solver upgrades completed: –Free Boundary (TSC): L. P. Ku, JP –Prescribed Boundary: G. Bateman, JP 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 JP

Sept. 19, 2007D. McCune20 The PTRANSP Coupled {Te,Ti} Temperature Solver Without linearization With linearization TSC solver method was ported into TRANSP by Lehigh U. Group; Extensive use in TRANSP for ITER Simulations by R. Budny & Lehigh U. team. GLF-23

Sept. 19, 2007D. McCune21 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.

Sept. 19, 2007D. McCune22 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.

Sept. 19, 2007D. McCune23 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.

Sept. 19, 2007D. McCune24 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.

Sept. 19, 2007D. McCune25 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).

Sept. 19, 2007D. McCune26 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.

Sept. 19, 2007D. McCune27 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…??

Sept. 19, 2007D. McCune28 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.

Sept. 19, 2007D. McCune29 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…