Version 12 (modified by butler, 15 years ago) (diff)


Welcome to the Trac site for NCNR SANS Software

This wiki and subversion repository browser are for software developed and managed by the SANS group at the NIST Center for Neutron Scattering.

The 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.

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.

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.

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.

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.

Contained here currently are links to release versions of:

There are also tips and tools for those using the repository:

For more information about the DANSE project and the SANS subproject:

Please contact Andrew Jackson (ajj@… x3146) with any questions.