30 January 2013 Hybrid RF/DC discharge generator of singlet oxygen for DOIL
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Proceedings Volume 8677, XIX International Symposium on High-Power Laser Systems and Applications 2012; 867703 (2013) https://doi.org/10.1117/12.2010047
Event: XIX International Symposium on High-Power Laser Systems and Applications, 2012, Istanbul, Turkey
Abstract
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.
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Josef Schmiedberger, Jan Gregor, Vít Jirásek, Karel Rohlena, Miroslav Čenský, "Hybrid RF/DC discharge generator of singlet oxygen for DOIL", Proc. SPIE 8677, XIX International Symposium on High-Power Laser Systems and Applications 2012, 867703 (30 January 2013); doi: 10.1117/12.2010047; https://doi.org/10.1117/12.2010047
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