Abstract
A flexible time-dependent, zero-dimensional plasma burn code with radial profiles was developed and employed to study the fractional power operation and the thermal burn control options for an International Tokamak Reactor (INTOR) sized tokamak reactor. The code includes alpha thermalization and a time-dependent transport loss that can be represented by any one of several currently popular scaling laws for energy confinement time. Feedback control of the auxiliary power and ion fuel sources are shown to provide thermal stability for operating points near the low-density, high-temperature portion of the ignition curve. It is concluded that the problem of thermal control and fractional power operation of a tokamak reactor with ignited plasma is far from trivial.
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