Www.efda-taskforce-itm.org Workshop on ITER Simulation, Beijing, May 15-19, 2006 European Integrated...

www.efda-taskforce-itm.org

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European Integrated Tokamak Modelling Task Force

TF Leader & Deputies: A. Bécoulet, P. Strand and M. Romanelli

EFDA CSU Contact Person: K. Thomsen

Presented by Alain Bécoulet


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EFDA(03)-21/4.9.2 (June 24th, 2003) Executive summary:

The aim of the task force is to co-ordinate the development of a coherent set of validated simulation tools for the purpose of benchmarking on existing tokamak experiments, with the ultimate aim of providing a comprehensive simulation package for ITER plasmas.

The remit of the Task Force would extend to the development of the necessary standardized software tools for interfacing code modules and for accessing experimental data.

In the medium term, this task force’s work would support the development of ITER-relevant scenarios in current experiments, while in the long term it would aim to provide a validated set of European modelling tools for ITER exploitation

Scope

EFDA recently approved a three year extension to the TF


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General structure of TF’s activities

projects for the 2005-6 work programme

The initial ITM Project structure covers:

- The Integrated Modelling Projects (IMPs), addressing modelling issues of fusion plasma physics which require a sufficiently high degree of integration.

- The Code Platform Project (CPP), responsible for developing, maintaining and operating the code platform structure. Support to IMPs is included.

- The Data Coordination Project (DCP), supporting IMPs and CPP for Verification and Validation aspects and standardisation of data interfaces and access.


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the 2005-2006 work programme schedule

IMP#1

CPP

DCP

IMP#2

IMP#3

IMP#4

IMP#5

prototype platform platform release

V&V proc.

co

de

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talo

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data management univ. access layer

V&V support

code identif. standardisation V&V, documentation

extend linear MHD codes

edge MHD, core MHD, disruptions

edge transport, core transport, integrated discharge evolutions

Linear stab, turbulence, neocl. transport

H&CD, fast particle instab. and losses

2005 2006 200X


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Data Coordination Project (DCP)

Objectives:– Provide tools for data access and exploration, – Develop and manage databases needed for physics exploration and

validation activities.– Assessment and collection of experimental data for V&V– Definition of V&V and performance metrics

Project Structure – 5 topical areas:– Data and database management– Universal data access layer (transparent access to data)– Validation and verification activities (with IMP’s)– Taskforce Software Strategies– Monitoring and evaluating emerging technologies: Grids

Interim leader: P. StrandDeputy: F. Iannone


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6Data models and database management

Short term storage system solution in place: (F. Iannone)– ~ 1Tb of storage available through MDS+ server hosted by ENEA a further

1Tb may be made available through other collaborations beginning 2006.• http://fusfis.frascati.ena.it/FusionCell

– Physics project storage needs are estimated for 4Tb end of 2006; more than 15 Tb longer term

Data structures: (J. Lister -> F. Imbeaux – phase 4 proposal)– Abstract description (XML schemas) of the data model for the Equilibrium

reconstruction project (IMP#1) – prototyping the TF wide data model.– Automatic generation of data descriptions in client languages (fortran,

matlab,...)– Provides unambiguous, standard description of data structures but hides

complexity from end user - http://crppwww.epfl.ch/~lister/euitmschemas

Database exploration tools - user access: (Y. Buravand) Start up work defining needs for

– Logbook browser – finding and characterizing TF database entries– Relational search capabilities and graphical/plotting engines


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6Data Access methods

Interim data access system: (W. Suttrop)– Simple C library with fortran bindings.

http://www.ipp.mpg.de/~Wolfgang.Suttrop/mdsplus/libitdb

– Further prototyping (IMP#1 efforts):• Improved memory handling (G. Huysmans)

• Tighter connectivity w datastructures (L. Appel)

Universal Access layer: (P. Strand, D. Muir)– “Device independent” access to data– Extensible through plug-in technology

• MDS+, HDF5, …

• Single interface to many data sources

– Detailed specification being written– Needs further resources for implementation

ITM

DBsITPA

DBs

USER

FILES

Switch/Mapper

HD

F5

MD

S+

???

UAL API


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6Procedures, protocols and strategies

Confidence in modelling results at the end user level can only be achieved through openness, accessibility, reproducibility and traceability throughout the V&V process.

DCP coordinates – Experimental data access and validation – Definition of performance metrics– Development of the V&V procedures (EFDA-TF-ITM(04)-8)

with the Integrated modelling projects

DCP is starting to evaluate software usage and needs within the fusion community to Formulate “Taskforce Software Strategies” defining the

– Use of commercial packages (Matlab, IDL,…)– Replacement strategies for commercial numerical libraries (NAG, IMSL,..)– Recommendations on code restructuring for increased portability, performance and compatibility.

Several associations are entering into GRID technology related activities: A study to evaluate the opportunities for TF has been initiated and a strategy for TF participation is being formulated


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Integrated Modelling Project 1

• Objective:– To provide an integrated suite of self-consistent codes (modules) for

equilibrium reconstruction and linear MHD stability analysis

• Topic 1A : Experimental Equilibrium reconstruction– CEDRES, CLISTE, EFIT, EQUINOX

• Topic 1B : Equilibrium codes and linear MHD stability– Equilibrium : CAXE, CHEASE, DIVA, HELENA, VMEC, DINA– Mapping : COTRANS, JMC – MHD Stability : CAS3D, CASTOR, KINX, MISHKA,

TERPSICHORE • Also:

– Equilibrium toolbox : FLUSH

Leader: G. HuysmansDeputy: L. Appel


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IMP#1: equilibrium and MHD Stability

• Standardise contributed codes to become independent of machine /diagnostic data.

– Use only external geometry data (from database)

– Definition of interfaces between codes and machine and diagnostics

• Validation and Verification

– compare equilibrium and MHD stability codes on benchmark case

– Apply codes to a relevant experimental problem/data

• MHD Stability limits in plasmas with an internal transport barrier.

diagnostic(1)description

machine description

diagnostic(2)description

magnetics MSE

equilibrium description

equilibrium reconstruction

high resolution equilibrium

code spec.parameters

code spec.parameters

equilibrium description

MHD stability code spec.parameters

MHD output description


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Machine independent EFIT_ITM• EFIT has been adapted to use the ITM

structures and to use external geometry information– A unique version of EFIT can now be used

for ITER, Tore Supra, JET, etc– Using only TF tools for

Data storage, accessand data structures

Validation effort underway


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Code Platform ProjectLeader: B. GuillerminetDeputy: M. Stanojevic• End User

•Tools to define the simulation

•Tools to run & monitor the simulation

•Tools for post-processing

• Developer

•Integrate the codes

•Component based

•Debug & test

• Administrator

•Deploy the simulator

•Monitor it

•Manage the archive

• Additional constraints

•Requirements: version (December 2005)


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6CPP: Existing frameworks

Name comments pros cons

Cactushttp://www.cactuscode.org/

Complete framework

Investigating CCA

No component model, no PIC

Pyrehttp://www.cacr.caltech.edu/projects/pyre

Simple framework

Investigating CCA, WS-RF

No component model

Salomehttp://www.salome-platform.org

Complete framework

Corba

Kepler CCA

MpCCI Code coupling

Meshing No component model, not open source

Xcat3 Java & C++ frameworks

Both CCA & WS-RF models

TF applications range from loosely coupled to very tightly coupled - No single tool likely to be sufficient.

Need to explore different approaches for different applications


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• Objective: Non linear MHD phenomena• Initial work on RWMs, sawteeth and ELMs has started.

• RWMs meeting held at JET, Nov 24-25. List of open issues has been compiled. Initial work on the assessment of plasma kinetic damping and of nonlinear coupling between mode amplitude and plasma rotation.

• Initial work on integrating a model for the prediction of the sawtooth period and amplitude in the JETTO transport code, together with fast particle behavior from the PION code, and prescriptions for fast particle losses and redistributions during sawtooth crashes, fishbones and TAE (tornado) modes.

• Initial work on the prediction of the sawtooth crash time, comparison with recent JET data. Sawteeth meeting held @ JET Feb 16-17

• Definition of a nonlinear numerical challenge on the evolution of reconnection driven by an ideally unstable internal kink mode.

Integrated Modelling Project 2Leader: F. Porcelli

Deputy: S. Sharapov


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• Implementation of a theory-based trigger model for ELMs in the JETTO code.

• RWMs assessment of plasma kinetic damping, using the CASTOR-K code, and of nonlinear coupling between mode amplitude and plasma rotation to be completed. Development of the CASTOR-FLOW code to include kinetic damping. Benchmark between CASTOR-FLOW and MARS-F codes.

• Sawtooth behavior integration of JETTO code, with a sawtooth trigger condition, PION code for the evolution of fast particle populations, and prescriptions for fast particle losses and redistributions during sawtooth crashes, fishbones and TAE (tornado) modes. Benchmark of JETTO sawtooh model with PRETOR code, validation against experimental results.

• Sawtooth reconnection scaling of the sawtooth crash time, comparison with recent JET data. Modelling of the nonlinear evolution of internal kink mode, using reduced resistive MHD codes.

IMP#2: Tentative workplan: 12/05 to 10/06


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Integrated Modelling Project 3Leader: D. Coster

Deputy: V. Basiuk, D. Kalupin, V. Parail , G. Pereverzev

Topic 3A: MHD equilibrium and stability modules (G. Pereverzev)

Topic 3B: Non-linear modules (sawteeth, ELMs, NTMs) (V.Parail)

Topic 3C: Transport models (D.Kalupin)

Topic 3D: Sources and sinks (V.Basiuk)

Topic 3E: Interfaces to boundaries (D. Coster)

•Objective:

–To provide the computational basis for a modular transport code, taking account of the core, the pedestal and the scrape-off layer. Ultimately, to enable the simulation of complete tokamak scenarios, e.g. for ITER.


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Edge Code Benchmarking

• ITPA activity: – code-code comparison

• Phase I: pure D, no drifts• Phase II: pure D, drifts• Phase III: D+C, no drifts• Phase IV: D+C, drifts

– SOLPS-EDGE2D/NIMBUS • Phase I completed successfully

(reported on at PSI 2004)

• Phases II and III in progress

– SOLPS-UEDGE• Phase I underway• Phase II expected to start soon

• Additional code-experiment– JET: SOLPS-EDGE2D/NIMBUS– AUG/D3D: SOLPS-UEDGE

EDGE2D D+C

EDGE2D D

SOLPS

SOLPS

EDGE2D


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Using MDS+ to connect SOLPS to ASCOT

• ITPA standard pedestal MDS+ tree created based on AUG shot 17151 (provides the equilibrium data)

• 2D background (ne, Te, Ti, …) written as MDS+ tree by SOLPS (IPP-Garching)

provides input to ASCOT. Due to open field lines, special care must be taken with the Monte Carlo collisions

• Planned: output of ASCOT to be saved to a MDS+ tree

ASCOT: (Accelerated Simulation of Charged Particle Orbits in a Tokamak) T. Kurki-Suonio, L. Aho-Mantila, J. Heikkinen, V. Hynönen, T. Kiviniemi, A. Salmi, S. Sipilä, V. Tulkki

Distribution of electrons reaching outer target


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Common interface to transport models

CALL ANOMALOUS(MODEL, PROFILES, GEOMETRY,TRANSPORT,[DIAG],ifail)

Derived types:Standardized Inputs: PROFILES, GEOMETRY defined in generic modules

(type definitions and allocations,…)Standardized Output: TRANSPORT defined in same generic modules

(fluxes + eff.diff for elec. + 2 ion species)Model dependent data: WEILAND; GLF23, RITM in specific model

dependent module (MMM95 and EDWM under testing) [DIAGNOSTIC]: Optional diagnostic output supplied in model dependent

formats.

Simple and extensible interface: New models need to supply 1. Default settings for options2. A mapping to actual model call (by template)3. Derived types for model specific inputs/outputs (may be empty!)


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Integrated Modelling Project 4Leader: B. Scott

Deputy: M. OttavianiObjective:To develop a suite of unified, validated codes to provide quantitative predictions for the linear properties of a range of instabilities, including: ion-temperature-gradient (ITG) modes, trapped electron modes (TEM), trapped ion modes (TIM), electron-temperature-gradient (ETG) modes, micro-tearing modes, etc.

• Three Formalised tasks:• Catalogue Codes, standardise documentation• Code verification and benchmarking• Development and exchange of elements of theoretical basis for model

• Benchmarking campaign has started (will run for 2 years)• Cyclone like base case and (unique to Europe) edge• also comparing neoclassical and turbulence code equilibria

• Intend to have most of the work decentralised


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IMP#4: Code Verification & Benchmarking

Core and edge standard cases:• L-mode edge near 100 eV and 2 x 1013 cm-3

• Standard Cyclone base case for core (local and global modes)

First results to be reported at the EPS meeting in Rome 2006


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Integrated Modelling Project 5Leader: T. Hellsten

Deputy: Y. Peysson, F. Zonca

- Objective: develop the computational basis for a modular package of codes simulating heating, current drive and fast particle effects

- Area covered: ECRH, ICRH, NBI, LH, alpha particle and fast particle interaction with instabilities

- Goal: self-consistent calculations validated against experiments

- Priority: realistic modelling applicable to ITER standard and advanced scenarios


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- Electron and ion physics (IC, LH, EC)- Kinetic calculations (2D, 3D, complex geometry)- Different types of wave solver (ray-tracing, full-wave,…)- Different numerical methods: Monte-Carlo, finite elements, finite difference, semi-analytical, …- Different languages: Fortran, C, MatLab- Different models for each problem (comparison, validity)

Challenge: merge existing tools in an evolutive platform

Integrated Modelling Project 5


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Progress on hardware issues

European 7th FP(2007 onward): the Petaflop’s world- massive parallel computing in Europe for Research purposes- UK; Germany; Spain; France willing to participate- scientific cases made in Barcelona in Dec 05- organisational issues in Cadarache in Feb 06, and Brussels in March 06.

Fusion: EU vs Broader Approach- need for dedicated HPC in the very near future (~100Tflops permanently)- Infrastructure support for theory and modelling being discussed- IFERC proposal under study (broader approach)- GRID computing solutions?

ITM-TF: the gateway- need for unique entry point (platform tools, database repository, computer access, data storage capability ..)- mutualisation of support


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IntegratedModelling-TF

CoordinatedTheory-TF

Support

Gateway

EU-Fusion-HPC

…

Code RepositoryData Servers

IFERC

EU-SuperComputers

Associations’Computers& ClustersAssociations

EFDA

GRID Technology

CSU Sc. Board


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International collaborative activity

Memorandum of Understanding

Outcome of the Satellite Meeting to the IAEA FEC 2004 (Vilamoura, Portugal) on Collaborative Activity between the Integrated Fusion Modelling Initiatives

put forward by the European Task Force on Integrated Tokamak Modelling

prepared by

A. Fukuyama, A. Kritz, Y. Gribov and A. Bécoulet

March 8th, 2005-03-08

The meeting took place on Friday, November 5th, 2004, between 16:30 and 19:30 in the Hidra Room, in parallel to the 19th IAEA FEC 2004 (Vilamoura, Portugal). Many representatives from USA, Japan, Russia, China, EU, ITER and ITPA were present, allowing a fruitful open discussion around the Integrated Modelling issues.

The open discussion raised the following points concerning the collaboration between the Integrated Fusion Modelling Initiatives (IFMIs):

- A Collaborative Activity (IFMI-CA) is seen as fundamental, presently between the Japanese BPSI initiative, the USA FSP project, the EU-ITM task force, the ITER Physics team and the ITPA structure, in order to ensure the necessary level of compatibility between such structures addressing high level integration of magnetic fusion modelling. Any other IFMI developed amongst ITPA partners would be welcomed to join the structure, when a need is formally expressed.

- This collaborative activity would be articulated around:

o A steering committee (IFMI-SC), initially composed by Dr A. Fukuyama (BPSI), Dr A. Kritz (FSP), the EU-ITM-TF leader (Dr A. Bécoulet), Dr Y. Gribov (ITER) and the chairman of the ITPA modelling group (Dr W. Houlberg).

o A periodical technical meeting (IFMI-TM), discussing the relevant integrated modelling issues. The format and periodicity of such a meeting would be under the responsibility of the IFMI-SC, acting as Programme Committee.

- IFMI-CA would be more particularly in charge of coordinating and promoting:

- The exchange of codes and models between the IFMIs - The information and compatibility between the choices of all kind: data access,

languages and formats, code platforms, … - The copyrights and agreement aspects - The interactions between IFMIs, ITPA and ITER

and more generally all the bi- or multi-lateral collaborations issues, taking place between IFMIs.


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INTEGRATED TOKAMAK MODELLING

More than ever a key element of

the FAST TRACK strategy for Fusion


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