GEM has two sets of software, ARIEL is used for analysing crystallographic data, and Gudrun and Open Genie is used to study disordered materials. This page gives an overview and links to the various programs available.
GEM Crystallography Software
ARIEL is a data reduction/visualisation package, developed primarily for the new high-intensity diffractometer GEM at ISIS. It was developed to address some fundamental concerns about GEM data handling, namely:
ARIEL is built as a fully instrument-independent, object-oriented code, that can be used for many different applications. ARIEL is written primarily in IDL, but makes some external calls to FORTRAN modules for data I/O (through the Open Genie Data Access Interface) and for some fast computation (e.g., Convert_to_Lambda). So far, ARIEL has been tested on 3 ISIS powder diffractometers: GEM, OSIRIS, and HRPD. The V. 3.2 version has a complete Graphic User Interface.
GEM Disordered Materials Software
There are two software programs which are required for correcting and analysing GEM data for disordered materials
1. The Gudrun program fully corrects neutron data, leading to a single structure factor which covers a wide range in Q as well as being fully corrected. It can be downloaded here.
2. The OpenGenie software can be used for visualising the data relatively quickly during the experiment, and for carrying out more careful data analysis on data corrected by Gudrun. It can be downloaded here.
In addition to this, a package of programs which run in Open Genie have been developed to analyse GEM data and should be installed with Open Genie. This package is called GEMSQRAW and can be downloaded here.
Installing Gudrun and Open Genie is relatively straightforward, but detailed instructions are given below along with the most likely errors which occur.
In addition to these programs, It is also recommended that XSECT is downloaded. XSECT is a program which produces a file containing information on the sample which is then used to calculate the self scattering. XSECT can be downloaded here, and a page giving information on how to use XSECT is here.
Finally a range of other useful software for analysing GEM data can be found here.
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