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Discussion for the 2012 Working Group Meeting to be held in Uppsala, 28-30 July 2012

  • Data Formats
    • The following is the agenda of work posted under business. Please add comments here:
    • 1D Format
    • agree a proposed foreign namespace extension of the current 1D standard (required to enable, for example, t-o-f instruments to store auxillary wavelength-dependent non-I(Q) data in the same output files)
    • agree resultant changes to the schema/stylesheet
   ARJN - I would recommend that during this meeting that the current format then be 'parked', the new 2D format
          should be flexible enough to handle 1D and 2D data
    • 2D Format
    • define minimum necessary for reduced data
      • review previous discussions on 2D
      • considerations specific to 2D reduced data
      • consider forward looking issues such as
        • grazing incidence
        • event mode analysis
    • suggest format framework (NeXus extension, canSAS 1D extension, other) with brief discussion of the reason for the choice (including options considered, pros and cons of each, and final weighing)
    • Guide to how to make implementation easy.
    • Create straw format suitable for test/demonstration use and convert some test data for such a demonstration.
    • Provide a plan for presentation at SAS 2012

  • Standards
    • The following is the agenda of work posted under business. Please add comments here:
    • Purpose and goals: Intercomparison of data measured on the same sample with different instruments and different techniques (SAXS, SANS, light scattering etc.) can prove valuable in a number of ways. In particular it aids understanding of details of the experimental methods and it can help assess reliability. In a similar way, looking at results of data reduction or analysis generated with different software can provide valuable information about performance and verification of methodology. Specifically these activities should:
      • Provide Quality Assurance/Quality Control,
      • Improve (reduce) uncertainties of SAS measurements in general,
      • Help each facility continuously improve performance and quality of data.
    • We will discuss what types of tests are interesting/important:
      • Beam intensity standards - there are several different ways to quantify this
      • Standards to test resolution
      • Absolute intensity calibrations,
      • Materials for Q calibration,
      • etc. etc,
    • Some other related issues:
      • Inelastic,
      • Multiple scattering,
      • Wavelength contamination,
      • Detector efficiencies at different wavelengths
      • limits in signal to noise - how weak a signal can be reliable extracted;
      • etc.
    • Outcomes needed are:
      • A written plan to sustain long term effort in this area
      • This should describe how to seed, co-ordinate and publicise “ad-hoc” projects ,
      • Assess how frequently exercises can be undertakem
      • Define good ways to disseminate/share results. This will including “advertising” projects and using them as input for other activities.
    • We should aim to define a list of 2 or 3 projects for work in the near term. This should include a plan of action and participants for each.
    • We shoud have a plan for presentation at SAS 2012. (This might just be an announcement of the plan and see who wants to participate?.)

  • Web Portal
    • The following is the agenda of work posted under business. Please add comments here:
    • define scope, purpose, and goal of portal
    • list content type to which such a portal should give access.
    • Suggest method for hosting
      • ?more distributed or more centralized,
      • ?under auspices of a particular facility or SAS commission
      • ? .. or both etc)
    • Build a working straw landing page prototype
    • Build at least 2 or 3 subpages and/or designs on paper
    • plan for presentations
      • SAS 2012
      • SAS commission

There are a number of places on the www with information about small-angle scattering. A portal needs to provide links to relevant information and extra content. The working group needs to find a way to make information readily available in an attractive way for different categories of people that will include scientists curious about the technique but unfamiliar, potential users, experienced users, etc. Some current pages are:

IUCr SAS Commission

Software for small angle scattering


World Directory of SANS Instruments

BioSAXS data analysis software (EMBL Hamburg)

Wikipedia Small-angle Scattering

These pages are examples of what is already available. The challenge is to provide access and to integrate information.

--AdrianRennie 06:38, 1 June 2012 (EDT)