strength of the diamagnetic self field approaches that of the vacuum field, the net field is small everywhere in the interior of the migma and large only near the surface, as seen in Fig. 3. The resulting field configuration is (a) from the plasma physics point of view, a mimmum-B surface field that promotes absolute plasma stability [5] and minimizes synchrotron radiation [6]; and (b) from the particle beam physics point of view, a strong-focusing configuration that maintains the axial dimensions of the disc. 3. Energy Balance in a Migma Reactor The original code used to model the energetic processes in a hypothetical migma reactor was known as BEBE. This is a zero-dimensional multigroup iterative code that is described elsewhere [2], A model of synchroton radiation transport by S. Tamor [7] has been incorporated into BEBE. The composite code now takes detailed magnetic and density profiles into account to calculate the energetic evolution of the reactor from start-up conditions to the achievement of a steady state ignited condition. The case we shall use in our calculations corresponds to a condition of maximal
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