Changes between Version 18 and Version 19 of WikiStart


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Timestamp:
Apr 23, 2010 10:43:31 AM (12 years ago)
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srkline
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  • WikiStart

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    55The NCNR has a long history of providing easy to use data reduction and analysis tools to its users. In the case of the SANS and USANS instruments, this is through a set of macros and functions implemented using the IGOR Pro™ package from Wavemetrics Inc, which is a general purpose plotting and data analysis package with a rich in-built programming language. 
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    7 With the advent of the NSF funded DANSE Project, which aims to build a complete suite of neutron scattering data analysis tools, and the opening of new neutron scattering user facilities at  the Oak Ridge National Lab (HIFR cold source), ANSTO in Australia (OPAL reactor) and KAERI in South Korea (HANARO cold source) we are taking the opportunity to evaluate the packages we provide. 
     7With the advent of the NSF funded DANSE Project, which aims to build a complete suite of neutron scattering data analysis tools, and the opening of new neutron scattering user facilities at  the Oak Ridge National Lab (HIFR cold source), ANSTO in Australia (OPAL reactor) and KAERI in South Korea (HANARO cold source) we are taking the opportunity to expand the packages we provide. 
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    9 This has lead to two initiatives. The first of these is to explore the possibility of collaborating with the above mentioned facilities to produce a shared code base of IGOR procedures for the reduction and analysis of small angle scattering data.  This would provide to users a familiar environment whichever facility they use and make co-analysis of data from different facilities much simpler, an often heard refrain from the nomadic scattering community. 
     9One initiative is to explore collaboration with the above mentioned facilities to produce a shared code base of IGOR procedures for the reduction and analysis of small angle scattering data. This would provide to users a familiar environment whichever facility they use and make co-analysis of data from different facilities much simpler, an often heard refrain from the nomadic scattering community. In the version 7.0 Release of the NCNR Package, users can load and reduce data collected at HFIR (BioSANS and HiResSANS, code modifications provided by the DANSE project), ILL (D22), and ANSTO (Quokka). 
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    11 The second initiative is to convert as much of the IGOR procedure code – which is written in an IGOR specific language and compiled within the IGOR program – to a generic library written in C. This separation of the graphical components from the analysis routines (scattering form factor and structure factor calculation, resolution smearing of models to match instrument geometry) provides both speed of calculation benefits and collaborative benefits. The former is important for co-fitting of multiple datasets (varying contrast, concentration, temperature etc) with complex models and initial testing suggests we can gain up to a 10-fold increase in computation speed. The latter is important because by abstracting out the actual computation code we can more easily make use of code from other sources – in particular we are working with the DANSE SANS subproject to define common interfaces to our libraries so that we can utilize each others work. 
     11Another initiative in conjunction with the scattering community is to produce reduced (1D, I(Q)) data in a common, standardized output format. Beginning with the 7.0 release, the NCNR package writes data in canSAS XML format. This data format is a product of international canSAS meetings, and the format is supported by many other facilities (ISIS, APS (Argonne), + others, name them). 
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    13 These initiatives are aimed at enhancing the tools available to our users in order to permit faster, more complex analyses of their scattering data than are currently possible. 
     13As always, these initiatives are driven by the needs and suggestions from facility users. Our aim is to enhance the suite of tools available to our users in order to permit faster, more complex analyses of their scattering data than are currently possible.  
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    16 Contained here currently are links to release versions of: 
     16'''Current release package - Version 7.0 - April 2010'''[[BR]] 
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     18[http://www.ncnr.nist.gov/programs/sans/data/red_anal.html NCNR SANS Package] 
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     20For a complete listing of what's new in the version 7.0 release: 
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