IAEAInternational Atomic Energy Agency

Coordinated Activities on Evaluation of Collisional Data for Fusion Applications

H.-K. Chung and B. J. Braams Atomic and Molecular Data Unit, Nuclear Data Section

Division of Physical and Chemical Sciences, IAEA, Vienna

October 1-4, 2012

ICAMDATA-8, Gaithersburg, MD

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Contributors to this presentation (direct)

I. Murakami, D. Kato, T. Nakano, Y. Itikawa, Y. Nakamura,

Alex M Imai, H. Takagi, T. Kato, F. Koike (Japan), G.W.F.

Drake, D. R Schultz, A. Kramida, P. Krstic, E. Landi, C.

Ballance (USA), J.-S. Yoon, M-Y. Song, H. Cho, C.-G. Kim,

J.-O. Choi (Korea), J. Yan, G. Liang (China), M. O'Mullane, N.

Mason, K. Aggarwal (UK), D. Reiter, D. Coster, J. Roth

(Germany), V. Kumar (India), S. Buckman (Australia), V.

Shevelko (Russia), G. Karwasz (Poland), S. Lisgo (ITER)

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Outline

• IAEA Atomic and Molecular Data Unit

• Needs of Evaluated Data for Fusion Applications

• IAEA Coordinated Activities on Evaluation of Collisional Data for Fusion Applications

• Future Activities

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IAEA atomic and molecular Data Unit

Who we are and why we are here

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IAEA : Accelerate and enlarge the contribution of atomic energy atomic energy to peace, health and prosperitypeace, health and prosperity

Assists its Member States, in the context of social and economic goals, in planning for and using nuclear science and technology for various nuclear science and technology for various peaceful purposespeaceful purposes, including the generation of electricity.

155 Member States2200 Staffs

IAEA A+M Unit formed in 1977

1976 at Culham Laboratory, UK

Review progress and achievements of A+M/PSI data for Fusion program

Stimulate international cooperation in measurement, compilation and evaluation of A+M/PSI data for fusion

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Coordinated Research Projects (CRP)

TheoriesMeasurements

Fusion Plasma Modelling

Data Evaluation

Databases (AMBDAS, GENIE, ALADDIN, Wiki…)

Publications(INDC, APID,

Bulletin)

Consultants Meetings

(CM)

Technical Meetings

(TM)

Data Compilation

International Coordination of A+M/PSI Data Research for Fusion

Data Production

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Online AM/PSI Data Services: http://www-amdis.iaea.org

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Network Collaboration for AM/PSI Data for Fusion

Data Centre Network

ADAS, Summers H. CRAAMD, Jun, Y. IAEA, Braams, B. J. JAEA, Nakano, T. KAERI, Rhee, Y. Kurchatov, Martynenko, Yu. NIFS, Murakami, INIST, Wiese, W.L. NFRI, Yoon, JORNL, Schultz, D. R.

Fusion Laboratories

ITEREFDA

JET, UKAEAASDEX-Upgrade, IPPTEXTOR, Jülich, FZJ

KSTAR, NFRINIFS, JAEAPPPL, ORNL

Code Centre Network

Curtin Univ. I. Bray Kitasato Univ. F. Koike

Univ. Autonoma de Madrid I. Rabadan Univ. P&M. Curie, Paris, A. Dubois

Univ. of Bari, M. Capitelli Kurchatov Institute, A. Kukushkin

Lebedev Institute, L. Vainshtein FZJ, D. Reiter

Ernst-Moritz-Arndt Univ, R. Schneider NIST, Y. Ralchenko

PPPL, D. Stotler LANL, J. Abdallah Jr.

IAEA, B. J. Braams HULLAC M. Klapisch CNEA, P.D. Fainstein

Data Users

Data Producers

IAEACoordination

CRPPublications

KnowledgebaseDatabasesMeetings

Data Centres &Evaluators

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Data Users Need: Evaluated and recommended data• Code Centre Network Meeting (October 2010)

CCN is organized to improve Online Code Capabilities to provide needed data for Data Users, particularly, Plasma Modellers

Data Users (D. Coster, D. Reiter, R. Schneider, D. Elder) participated to interact with the code producers

• Discussions Online Codes generate too many data sets without quality

information Data Users need Complete sets and/or Recommended data

• At every meeting, data evaluation / quality was an issue IAEA Meetings VAMDC (Compilation & Distribution) SUP@VAMDC

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Needs of Evaluated Data for Fusion Applications

From user’s perspectives

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Typical edge transport code runtime (for same model, same equations, same grid size)

1 day

1-2 weeks

3 months

TEXTOR (R=1.75 m)Jülich, GER

JET (R=2.96 m), Oxford, UK

ITER (R=6.2 m), Cadarache, FRA

Because of more important plasma chemistry (increased non-linearity, non-locality, in sources).

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• Data needs to be “verified” by an expert

• Data needs to be “robust”

• Data needs to be “comprehensive”

• Data needs to be easy to use

• Version control: know what data was used for a particular run, and which runs used a particular version of the data

• Needs to be efficient

• Needs to be able to address special needs

“Robust” Data

“Verified” Data

Requirement for Plasma Modelling: Reliable data sets for AMNS data

Require a Recommended & Internationally Agreed Library for Atomic, Molecular, Nuclear, Surface Data

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IAEA Activities on evaluation and recommendation

A series of meeting to organize community efforts for evaluation and recommendation of A+M/PSI Data

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Data Centre Network Meeting (2011)

Data Evaluation Tasks are Difficult• Lack-of man-power: Experts retiring or leaving the field

• No young people get in the field (no publication, no funding)• Evaluation requires multiple sets : Too many or too few• Very few benchmark experiments for collisional data• Even fewer uncertainty estimates for theoretical data

Conclusions• Data should be first collected and available for evaluation• Evaluation activities should be organized in the community• Evaluation guidelines should be established in the community• A list of recommended data sets should be available as a final product

Current status• NIST: Critical evaluation of atomic structure and transition probabilities • NFRI/KRISS: National efforts to establish standard data sets• NIFS/JAEA: Evaluated data libraries, Collaboration• IAEA/ORNL: ALADDIN, individual consultancies

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Coordination Meetings for Evaluationhttp://www-amdis.iaea.org/DCN/Evaluation/

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IAEA-NFRI TM on Data Evaluation:http://www-amdis.iaea.org/meetings/NFRI2012/

• 24 Presentations (2.5 days) and 1 day Technical Discussions

• Topics (Focused on Reaction Data) Current Evaluated Databases (Kramida, Landi, Mason)

Evaluation Methods and Experiences (Itikawa, Kumar, Cho, Karwasz)

Error Propagation and Sensitivity Analysis (O’Mullane, Ballance, Reiter, Krstic)

Theoretical Data Evaluation (Aggarwal, Liang, Takagi, Song)

Experimental Data Evaluation (Nakamura, Buckman, Shevelko, Imai)

Data Centres Evaluation Activities (Yoon, Murakami, Mason, Chung)

• Participants from Australia, China, Germany, India, Japan, Korea, Poland, Russia, UK, USA and IAEA.

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Summary of Discussions

Community Role

•Involve the community in data evaluation

•Engage young generation for transfer of knowledge

•Define terminology and vocabulary used in evaluation

•Define common workflow guidelines

Technical Issues

•Assessment for theoretical data•Assessment of experimental data

•Error propagation and Sensitivity Analysis

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Community Role: Consensus Building

• Change of notions: Databases Data research

• Engage young generation (in early career) Culture should teach that data evaluation is a critical part of scientific work Publication Issues: Review publications are good for career development Funding Issues: Evaluation leads to the gap of understanding of the field and finds

interesting problems

• Disseminate materials to train students and researchers with the “Critical Analysis Skills”

• Disseminate the standard definitions of terminologies adopted by international organizations (IAEA, IUPAC, IUPAP, BIPM, ISO, WHO, FAO, etc)

• Agree on the procedure of evaluation towards a standard reference data

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Define Terminology: Uncertainty ApproachIt’s NOT AN ERROR but AN UNCERTAINTY

• Terminology in metrology VIM (Vocabulaire International de Métrologie, Bureau Int. des Poids et Measures) 2007 GUM (guide to the expression of uncertainty in measurement) 2008

• Measurement and uncertainty The objective of a measurement is to determine the value of the measurand (GUM) In general, a measurement has imperfections that give rise to an error in its result.

Error 1 = Measurement result – True value (Error approach)

True value : value consistent with the definition of a given particular quantity

Error 2 = Measured value – Reference value (Uncertainty approach)

Reference value (Assigned value): The reference quantity value can be a true quantity value of the measurand, in which case measurement error is unknowable, or an appropriate, known quantity value such as a conventional quantity value or a specified target quantity value to be realized in a production process.

value value and uncertainty

uncertainty

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Any measurement has an uncertaintyV

alu

e a

nd

un

cert

ain

ty

Time, method, place, person, procedure

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Uncertainty Approach based on VIM & GUM: The true value lies within the uncertainty range

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Common Workflow Guidelines for Evaluation of Collisional data

Advantages: Easier to expand the evaluators’ network

including early career researchers. Introduce more rigorous procedures for

evaluation and increases the dependability of the evaluation.

Disadvantages: The quality of evaluation critically depends

on the experiences of the evaluators. It is possible that different people may

reach at different conclusions using the same guidelines and the results may not be reproducible.

Solutions: Collaborations can help reducing the

disadvantages. Evaluation activities by scientific advisors

and editorial panels will be a great mechanism to produce the evaluated data library.

Workflow of critical evaluation of data on wavelengths and energy levels (NIST)

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Evaluation by Editorial Board Panel

• Evaluation and recommendation require the community consensus with an endorsement from the IAEA or other international authorities

Establishment of the evaluation guidelines: will evolve with time and experience with broad collaborations from the community

Group Evaluation: 4-5 panelists including young and senior people like the editorial board for a journal with the broad backgrounds (experimentalists, theoreticians, producers and users)

Self-Evaluation: Data producers with a deep knowledge in some cases. May work better for theoretical data sets.

• Merits of Group Evaluation: Facilitate the knowledge transfer to younger generation Review papers can be written for the evaluation work Make the data research project visible to the Community

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An example of evaluation towards a Standard Reference Data Evaluation (NFRI)

Data Compilation 1st evaluation (experts)Final Evaluation(Panel Decision)

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Summary of Discussions

Community Role

•Involve the community in data evaluation

•Engage young generation for transfer of knowledge

•Define terminology and vocabulary used in evaluation

•Define common workflow guidelines

Technical Issues

•Assessment for theoretical data•Assessment of experimental data

•Error propagation and Sensitivity Analysis

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Theoretical Data Evaluation

• No criteria of assessments for theoretical data

• A Critical need: guidelines for uncertainty estimates of theoretical data

Should not try to give a straight recipe for assessing uncertainties, however, there are still several to start with.

• There are prescriptions such as energy grids for resonances and partial waves.

• One may take a model to see a convergence and estimate uncertainties based on assumptions within the model.

Comparisons with experiments: this can be dangerous. Comparisons among different theories: if some theories are better than

another, it may be given a benchmark status. For scattering data maybe we should aim for “ideas” or “suggestions” rather

than “guidelines”.

• Theoreticians may have an idea of uncertainty estimates already Journal policies can change the culture: PRA policies

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Experimental Data Evaluation

• Check Lists Uncertainty estimates or error assessment critical Self-consistencies checked Experimental techniques evaluated. Reputation of the data producer considered Anomalies in some experimental processes (ro-vibrational / metastable)

• Wish Lists Evaluation by a group of “established’ experts with broad expertise Provide Recommended values where possible Include a comparison with theory and an assessment of overall status Evaluation will lead to the understanding of the gaps of the field Establish “benchmarks” where possible:

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Atomic structure

collision codes fundamental data Processed data (rate coef.) CR transition matrix A = A_excitation + A_radiative + A_ionization + A_recombination + A_charge-exchange ….

effective rates,

population coefficients cooling rates, beam stopping rates,….

Error Propagation and Sensitivity Analysis: Uncertainties in “Data” & “Data Processing Toolbox” ?

experimental data

Velocity distribution:Boltzmann solver,Maxwellian

Linear algebra,ODE solvers

Sensitivity,error propagationto final model results:PDEq, IDEq,…leave to modelers,spectroscopists

Monte Carlo

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Future activitiesNeed the community feedback and support

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Near-term goals

• Priorities for evaluation Electron scattering on Beq+. (IAEA CRP) Electron scattering on CH4. (NFRI group)

Charge exchange and electron loss for H on Beq+.

• Action Items Developing an evaluators network – Key people identified Inventorise datasets that are now used by fusion plasma modellers Sketch out guidelines for uncertainty assessment of theoretical data Organize a workshop (SUP@VAMDC) NFRI to organize a data evaluation group for demonstration The ITER project should recognize the need of standard reference

data (SRD) for A+M processes used in the design

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Long-term goal….

Data Users

Data Producers

Data Evaluators

Data Needs

Experimental and Theoretical Data Production

Data Compilation, Evaluation and Recommendation

Global Network towards the Internationally Agreed Data Library for Fusion and other Plasma Applications

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The development of a standard library: Document data sets used by the fusion community

Priority List of Critically Needed Data

Database of Available Data for Evaluation

Basis of Evaluated Data Library

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Evaluation of evaluated data sets:a prototype of evaluated data library

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Summary

• The series of IAEA meetings including the Joint IAEA-NFRI TM on Data Evaluation were highly successful in drawing consensus from participants on the coordinated data evaluation activities by the community. Disseminate the concepts of VIM3 (International Vocabulary of Metrology), GUM (Guide

to the expression of Uncertainty in Measurement) and “Critical Assessment Skills” Engage younger generation in the process Collaborate with colleagues in the community Change the culture about data research with publications

• IAEA A+M Data Unit will actively participate in organizing and coordinating the community effort in the data evaluation activities, ultimately towards the standard data library for fusion applications. Assess the needs of user communities Collaborate with SUP@VAMDC

• We urge you, the community to join us in the data evaluation activities that will benefit data users, producers and evaluators in the future.