Optimization and analysis of shape of coaxial electrode for microwave plasma in water

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  • Yoshiaki Hattori
    Ehime University Department of Engineering for Production and Environment, Graduate School of Science and Engineering, , Matsuyama 790-8577, Japan
  • Shinobu Mukasa
    Ehime University Department of Engineering for Production and Environment, Graduate School of Science and Engineering, , Matsuyama 790-8577, Japan
  • Shinfuku Nomura
    Ehime University Department of Engineering for Production and Environment, Graduate School of Science and Engineering, , Matsuyama 790-8577, Japan
  • Hiromichi Toyota
    Ehime University Department of Engineering for Production and Environment, Graduate School of Science and Engineering, , Matsuyama 790-8577, Japan

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<jats:p>The effect of the shape of the electrode to generate 2.45 GHz microwave plasma in pure water is examined. Three variations of a common coaxial electrode are proposed, and compared according to the power required for plasma ignition and the position of plasma ignition in pure water at 6 kPa using a high-speed camera. These coaxial electrodes are calculated using three-dimensional finite-difference time-domain method calculations. The superior shape of coaxial electrode is found to be one with a flat plane on the tip of the inner electrode and dielectric substance located below the tip of the outer electrode. The position of the plasma ignition is related to the shape of the coaxial electrode. By solving the heat-conduction equation of water around the coaxial electrode taking into account the absorption of the microwave energy, the position of the plasma ignition is found to be not where electric field is the largest, but rather where temperature is maximized.</jats:p>

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