JETCAT: a programme for computerised tomography

A new method of computerised tomography for efficient reconstruction from sparse data has been described by Williamson and Evans (Computerised Tomography for Sparse-Data Plasma Physics Experiments. CLM-P 656) and the Fortran programme JETCAT has been written to process the data, and for the interactive design of experimental assemblies to achieve optimal performance. This report, which should be read in conjunction with the programme listing attached, describes the overall structure of the programme, explains each subroutine, and specifies the input and the outputs that occur. The work was motivated by a design study for interferometry on the Joint European Torus (JET), but it can be applied to any other tomographic experiment with sparse data. (author)