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In this study,the effects of the fluid cooling and electric field line deformation were investigated in a dielectric barrier discharge (DBD) plasma source.The DBD plasma jet is improved by covering the ground electrode and a power electrode with insulating oil.We obtained positive results as insulating oil prevents arc formation,while it improved the supplied power and plasma jet length,and increased radical production.Radical production of this nonthermal plasma jet is studied with polyvinyl alcohol-potassium iodide liquid.