TRAPCAD - A TOOL TO DESIGN AND STUDY MAGNETIC TRAPS OF ECR ION SOURCES

To design the magnetic system of the Debrecen-ECRIS and to study the b ehaviour of charged particle traps a graphical computer code (TrapCAD 1.0) was developed. This code uses the outputs of popular general-purp ose magnetic field calculation codes (e.g. POISSON/PANDIRA) as input. The TrapCAD offers several built-in functions: draws field lines, flux tubes and the surfaces of equal magnetic field. It is also possible t o calculate and visualise the one-particle movement of charged particl es in the trap. This paper describes all the details of the code imple mentation, features and functions. Examples for the optimization of th e Debrecen-ECRIS - to reduce the price of the hexapole magnet and the electrical consumption of the solenoids - are also given.