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Hybrid RF/DC discharge generator of singlet oxygen for DOIL

Recent research on high-pressure hybrid radiofrequency/arc (RF/DC) generator of singlet oxygen for DOIL is presented. A stable hybrid RF/DC discharge with a diffusive arc root near the anode side was demonstrated experimentally under well defined conditions. A minimization of anode erosion and a non-equilibrium state of the arc plasma were achieved in this way. The RF discharge is used for the ignition of the DC arc and its sustainment. The hybrid discharge can be characterized as an RF sustained (i.e. non-self sustained in the pure DC mode) DC arc between a conventional glowing tungsten cone cathode and a cooled aluminum cylindrical anode with a diffusive arc mode. The diffusive mode of the arc is assisted by a plasma anode formed inside the aluminum anode channel due to the radiofrequency. The generation of singlet oxygen was achieved by a laterally symmetric injection of neutral oxygen in a mixture of O2+He+NO into the Ar+He plasma jet of the hybrid RF/DC plasmatron. An overview of basic characteristics and CFD modeling of some key gas flow phenomena are presented. The research is directed to experimental investigation and theoretical modeling of the hybrid plasma. In the case of its successful completion it will be used for pumping a discharge oxygen-iodine laser.