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Numerical modeling of subsonic COIL with an arbitrary magnetic modulation

The concept of 1D subsonic COIL model with a mixing length was generalized to include the influence of variable magnetic field on the stimulated emission cross-section. Equations describing the chemical kinetics were solved taking into account together with the gas temperature also a simplified mixing model of oxygen and iodine molecules. With an external time variable magnetic field the model is no longer stationary. A transformation into the system moving with the mixture reduces partial differential equations to ordinary equations in time with initial conditions given either by the stationary flow at the moment when the magnetic field is switched on or by the boundary conditions at the injector. Advantage of this procedure is a possibility to consider an arbitrary temporal dependence of the imposed magnetic field and to calculate directly the response of the laser output. The results will be compared with the experimental data measured on the subsonic version of the COIL device in the Institute of Physics, Prague.