We have numerically studied the transient behavior of the evolution of Field Reversed Configuration (FRC) plasma with rotating magnetic field. The plasma formed by a field reversed theta pinch is evolved by increasing the internal magnetic flux with a rotating magnetic field (RMF) and by regulating the axial magnetic flux. The dynamic responses of a plasma pressure, separatrix radius and length are obtained by solving the radial force balance and the energy balance under the assumption of preservation of a current profile. We study the conditions for a successful evolution on the initial plasma parameters, and the time variations of the RMF angular frequency and axial magnetic field. It is shown that an FRC may be evolved to the plasma with larger internal magnetic flux by applying an RMF and controlling external axial magnetic field appropriately.
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