A Web-based Instrument Design Application to Support MCLIB

T.G. Thelliez, P.A. Seeger, L.L. Daemon and R.P. Hjelm, Jr.
CIC-15 Advanced Databases and Information Systems, Los Alamos National Laboratory

An open standard for simulation of neutron scattering instruments (MCLIB) is proposed by P.A.Seeger et al. A web-based application has been developed on top of this package for several reasons:
1- The web is used to avoid having to deal with cross-platform issues. The web technology (servers, browsers) is mature enough to develop such applications.
2- Creation of the geometry file required for input to the MCLIB application code (MC_RUN) is not an easy task. This application allows the end users to create such files through several easy Web forms. A file can then be downloaded to the end user's computer and used to run a simulation on the local machine.
3- This application is also a server of element types used in the instrument composition. The end users have access to a central library of approved element types.
4- This application can also output a 3D interactive view of the instrument being built.
5- Because the Web pages are very easy to use, this application can be seen as a teaching tool focusing on the physics and hiding the code complexity.
6- At a higher and more complex level, this application is also a repository and an interface for creating new element type definitions. An 'expert' can define (in his own space) new beam-line elements from region types already existing in the MCLIB library or incorporating new physics models. This application can thus be seen as a compiler of element-type definitions. We will have a methodology and an approval process so that a locally defined element type can become available to the world after review.

Examples and demonstrations will be given.

(posted 24-Oct-97 jw)