nea/nuclear science committee/wpec · 2012-05-29 · llnl-pres-xxxxxx this work was performed under...

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LLNL-PRES-XXXXXX This work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under contract DE-AC52-07NA27344. Lawrence Livermore National Security, LLC NEA/Nuclear Science Committee/WPEC 24-25 May 2012

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Page 1: NEA/Nuclear Science Committee/WPEC · 2012-05-29 · LLNL-PRES-XXXXXX This work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory

LLNL-PRES-XXXXXX

This work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under contract DE-AC52-07NA27344. Lawrence Livermore National Security, LLC

NEA/Nuclear Science Committee/WPEC 24-25 May 2012

Page 2: NEA/Nuclear Science Committee/WPEC · 2012-05-29 · LLNL-PRES-XXXXXX This work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory

Lawrence Livermore National Laboratory LLNL-PRES-xxxxxx

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Back in 1960, LLNL developed ENDL (a precursor to ENDF)

Problems arose in our simulation-heavy modern era with our database

• Took up too much space -- only handles pointwise data

• Only supports a fixed number of reactions

• Other infrastructure also old and limiting

• Couldn’t share/compare -- Everybody else using ENDF

Conclusion:

• First step: Adopt ENDF and join the rest of the world

• Second step: Design a new “structure” and infrastructure

LLNL saw important benefits to this transition:

• Develop expertise in a new generation of scientists and engineers

• Enhance simulation capabilities

Page 3: NEA/Nuclear Science Committee/WPEC · 2012-05-29 · LLNL-PRES-XXXXXX This work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory

Lawrence Livermore National Laboratory LLNL-PRES-xxxxxx

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Next generation is more comfortable with and interested in modern concepts

• XML, HDF5, MySQL, Python, Java

Leverage vast, well-tested infrastructure

• Automated format controls

• Routines for code access libraries automatically generated

• Large user base from governments to industry

Remove artificial limits imposed by legacy formats

• Data precision essentially unlimited

• Extensible without sacrificing backwards compatibility

• Optimized I/O for large parallel simulations

Link disparate databases to each other

• Reactions, level structure, mass tables can all be cross referenced

There is a cost to change,

but modern programming and database practices have real benefits

Page 4: NEA/Nuclear Science Committee/WPEC · 2012-05-29 · LLNL-PRES-XXXXXX This work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory

Lawrence Livermore National Laboratory LLNL-PRES-xxxxxx

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Define a common data model

• How should the data be organized?

Agree on a set of “best” practices and how to implement them

• Engineered versus administrative controls

Define a process to publish and update the standard

• How do we agree things are ready?

Implement and test with current international data libraries

Page 5: NEA/Nuclear Science Committee/WPEC · 2012-05-29 · LLNL-PRES-XXXXXX This work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory

Lawrence Livermore National Laboratory LLNL-PRES-xxxxxx

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Other likely requirements:

Small set of general-purpose data containers

Support for functional descriptions of data

Support for multiple forms of the same data • Functional, Pointwise, Grouped, etc.

• Evaluator enters the native data, other forms are derived

Hierarchy by time?

1. Two-bodies interact

2. Direct processes

3. Other fast processes

4. Compound nucleus

5. EM decay

6. Weak decay

Page 6: NEA/Nuclear Science Committee/WPEC · 2012-05-29 · LLNL-PRES-XXXXXX This work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory

Lawrence Livermore National Laboratory LLNL-PRES-xxxxxx

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‘Engineered’ controls can be enforced by design of GND:

• Eliminate inconsistent data

— Multiple particle masses in ENDF vs only one value in GND

• Require certain channels or outgoing spectra

• Require documentation

• Require ‘nativeData’ to indicate form chosen by evaluator

‘Administrative’ controls enforced by quality assurance tools (i.e., checking codes):

• Require same units throughout?

• Require all quantities defined up to (at least) 20 MeV?

Achieving consensus on best practices will be challenging

Page 7: NEA/Nuclear Science Committee/WPEC · 2012-05-29 · LLNL-PRES-XXXXXX This work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory

Lawrence Livermore National Laboratory LLNL-PRES-xxxxxx

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Agree on meta-language for exchanging data and specifying

data model

• Probably XML

Develop quality assurance tests on standard

• Convert from ENDF to GND back to ENDF

• Supports data available in older formats

• Plotting and validation tools exercised

Propose a governance model

Page 8: NEA/Nuclear Science Committee/WPEC · 2012-05-29 · LLNL-PRES-XXXXXX This work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory

Lawrence Livermore National Laboratory LLNL-PRES-xxxxxx

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Sub-group participants will

• Develop a common data model for reaction data

• Agree on best practices and how to “enforce” them

• Test things out with their local ENDF-formatted databases

• Propose a process for dissemination and future modifications

LLNL and USNDP is committed to seeing this through

Benefits are significant

• Attract and retain next generation of scientists and engineers

• Leverage significant infrastructure that will continue to evolve

• Overcomes limitations of existing format in an extensible way

• Positions community to link disparate data products to each other

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