ARCHITECTURE OF THE ETR SYSTEMS CODE.

TETRA, a tokamak systems code capable of modeling experimental test reactors, was developed in a joint effort by members of the fusion community. The first version of this code was constructed to model devices similar to the Tokamak Ignition/Burn Engineering Reactor (TIBER) in configuration and design. A major feature of this code is its ability to perform optimization studies. Future work will include broadening the scope of the code, particularly in the area of materials selection, to simulate more accurately tokamak configurations such as the Next European Torus (NET) and the Fusion Engineering Reactor (FER).