Use of Underwater Discharge Plasmas to Keep Aquarium Environment

Summary form only given. Many researches to treat wasted water have been performed around the world since the water plays essential role in our life. In the present situation, the discharge plasma produced in water has been an attractive technique to treat wasted water, as the result of development of pulsed power technology. In this work, in order to get the electron density in underwater discharge plasma as one of the important plasma parameter, the spectroscopic measurement of discharge emission was performed. For the calculation of time-history of electron density during underwater discharge, the emission from H_alpha was recorded by the streak camera equipped with spectrometer and the Stark broadening analysis was performed.