Abstract
In an attempt to explain the details of plasma-wall interaction during hard disruptions in tokamaks, a theory has been conceived whereby the formation of so-called “virtual limiters” is predicted to occur. Accordingly, a numerical code has been prepared, based on a somewhat simplified mathematical description of the complex interplay that is envisaged to take place between three systems: the hot plasma, the solid first wall, and the “virtual limiter” — namely, the cloud of vaporized material (impervious to the hot plasma particles) which is originated because of the very high heat loads that are produced over certain spots of the first-wall system. The full evolutionary history of the phenomenon is in principle amenable to investigation with the help of the prepared numerical code — albeit with some degree of uncertainty, resulting from the rather crude approximations that have been resorted to, due to the complexity of the problem.
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