Results of NIAC Meeting April 26-28

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Results of NIAC MeetingApril 26-28

• P.F. Peterson
• Executive Secretary, NIAC

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What is NeXus?

• Neutron
• e
• X-ray
• µ (muon)
• science
• data format

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Is it based on anything?

• Hierarchical Data Format (4 and 5)
• NXopen(filename,NXACC_CREATE4,handle)
• NXopen(filename,NXACC_CREATE5,handle)
• eXtensible Markup Language (in 3.0)
• NXopen(filename,NXACC_CREATEX,handle)
• NXopen(filename,NXACC_RDWR,handle)
• NXopen(filename,NXACC_READ,handle)

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What is the NIAC?

• NeXus International Advisory Committee
• supervise the development and maintenance of
  the NeXus common data format for neutron, x-ray,
  and muon science.
• Formed in October of 2003

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NIAC Members

• Freddie Akeroyd, ISIS RAL
• Stuart Campbell, DIAMOND RAL
• Stephen Cotrell, ISIS RAL
• Matthias Drochner, DIDO (FRJ-2) FZ-Juelich
• Ron Ghosh, ILL
• Andy Gotz, ESRF
• Nick Hauser, BI ANSTO
• Przemek Klosowski, NCNR NIST
• Mark Koennecke, PSI
• Peter Link, FRM2 TUM
• Nick Maliszewskyj, NCNR NIST (technical chair)
• Ray Osborn, IPNS ANL (chair)
• Toshiya Otomo, KENS and J-PARC KEK
• Peter Peterson, SNS ORNL (executive secretary)
• Thomas Proffen, MLNSC LANL

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What do instrument definitions do?

• NXdata contain information for simple plotting
• Instrument definitions declare information
  required for data reduction/analysis
• Information useful for data treatment, but not
  required, is also denoted

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NIAC Meeting Results

• Minutes
• NeXus API (NAPI) user reference guide
• NAPI 3.0 beta released May 20
• Release and testing plan
• Technical reference manual
• Example files

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Technical Reference Manual

• Overview of definitions
• Explanation of definition format
• Base classes
• Instrument definitions

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Instrument Definitions

• Cartoon of prototype instrument
• Description of instrument in simple terms
• Overview of definition contents
• Definition in metaDTD format

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Instrument Definitions

• Monochromatic Reflectometry
• Small Angle Scattering
• Time of Flight Direct Geometry Spectrometer
• Time of Flight Powder Diffraction
• Time of Flight Reflectometry
• Triple Axis Spectrometer
• Muon Instruments

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Instrument Definitions

• The instrument definitions will be submitted to
  the instrument editors for comments and
  finalization.  A complete proposal including
  examples should be ready by May 20.  The initial
  release of these definitions will be ratified by
  a vote on May 27 by the NIAC.