sept. 19, 2007d. mccune1 transp and ptransp: status and plans presented at jet/mast transp users’...

Sept. 19, 2007 D. McCune 1

TRANSP and PTRANSP: Status and Plans

Presented at JET/MAST TRANSP Users’ Meeting,Sept. 19, 2007


TRANSP: Vision Statement

Provide a comprehensive end-to-end modeling

capability for magnetic confinement fusion energy experiments of today and

tomorrow.


Traditional TRANSP: Overview

Preliminary dataAnalysis andPreparation

(largely automated)

DiagnosticHardware

Experiments (Asdex-U, C-Mod, DIII-D, ITER, JET, KSTAR, MAST, NSTX)

20-50 signals {f(t), f(x,t)}Plasma position, Shape,Temperatures, DensitiesField, Current, RF andBeam Injected Powers.

TRANSP Analysis*:Current diffusion, MHD equilibrium, fast ions, heating, current drive;

power, particle and momentum balance.

TRANSP Analysis*:Current diffusion, MHD equilibrium, fast ions, heating, current drive;

power, particle and momentum balance.

Experiment simulationOutput Database

~1000-2000 signals{f(t), f(x,t)}

Visualization

Load RelationalDatabases

Detailed (3d) time-slice physics simulations: GS2, ORBIT, M3D… *FusionGrid TRANSP

on PPPL servers

Pre- and Post-processing at the experimental site… MDS+

MDS+


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)


PPPL TRANSP Run Production

0

500

1000

1500

2000

2500

3000

3500

Completed Runs

FY-2005

FY-2006

FY-2007 (est.)

Fusion Grid TRANSPFusion Grid TRANSP(SciDAC Collaboratory)(SciDAC Collaboratory)


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.


Beam ion RF-power absorption match between NUBEAM and TORIC5

total RF-power from NUBEAM

total RF-power from NUBEAM

total RF-power from TORIC

total RF-power from TORIC


RF-field renormalization constant for power match


Beam ion RF-power absorption profiles


TORIC5 NUBEAM

Beam ion RF-power absorption profiles by NUBEAM and TORIC5


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.


MPI-Parallel Module ServerSerial 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 TRANSPModule 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. (http://w3.pppl.gov/NTCC) to be used for Fusion Simulation Project prototype and tested in TRANSP deployment.

*viability of method depends on keeping files small.

network

http://w3.pppl.gov/NTCC


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.


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…


RPLOT and TRDAT in ElVis

Single window for plots. Command line i/o

RPLOT session shown:


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…


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).


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.


PTRANSPPTRANSP 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.


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


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.


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.


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.


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.


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).


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.


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…??


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.


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…

sept. 19, 2007d. mccune1 transp and ptransp: status and plans presented at jet/mast transp users’...

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