Optimized multi-modal-operation designs for ITER

The tokamak nonlinear optimization systems code TETRA has been expanded to contain the option of examining machine designs capable of multi-modal operations. The conceptual International Thermonuclear Experimental Reactor (ITER) is an example of a bi-modal operating machine design in that it must be capable of both pulse-ignited and steady-state operations. This new version of TETRA allows for the optimization of a figure-of-merit which may involve several operating scenarios. The authors obtain for ITER minimum cost designs which are capable of igniting when operated in the pulsed mode as well as have reasonable Q > 5 when operated in steady-state