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Title
Japanese: 
English:Investigation of a Large-Diameter Helium Plasma Jet with a Floating Electrode Setup 
Author
Japanese: 林珂任, 吉村信次, マイケル モウ, 菊地航行, 山下雄也, 榎本純, 後藤基志, 赤塚洋, 堤隆嘉.  
English: Keren Lin, Shinji Yoshimura, Michael Mo, Wataru Kikuchi, Yuya Yamashita, Jun Enomoto, Motoshi Goto, Hiroshi Akatsuka, Takayoshi Tsutsumi.  
Language English 
Journal/Book name
Japanese: 
English:Bull. Americal Phys Soc. 
Volume, Number, Page        
Published date Oct. 13, 2025 
Publisher
Japanese: 
English:Americal Physical Society 
Conference name
Japanese: 
English:The 78th Annual Gaseous Electronics Conference (GEC2025) 
Conference site
Japanese:ソウル 
English:Seoul 
Official URL https://schedule.aps.org/gec/2025/events/DW5/19
 
Abstract A large-diameter helium atmospheric pressure plasma jet (APPJ) system was developed using two floating electrodes and an insulating layer beneath the grounded electrode. This configuration enabled relatively stable and uniform plasma plume generation, making it suitable for biomedical applications. To investigate the underlying mechanisms, we conducted optical emission spectroscopy (OES), ICCD imaging, and numerical simulations. Results show that the addition of a floating electrode between the high-voltage and ground electrodes reduces the local electric field during the positive half-cycle, suppressing electron avalanche formation. Furthermore, insulating tape between the tube and ground electrode lowers the field strength and potential drop, enabling more electrons to reach the nozzle while limiting space charge accumulation. The floating electrode near the nozzle increases the local potential, helping confine electrons within the tube. These effects contribute to a more uniform and extended plume. Our findings highlight the importance of radial electron dynamics in large-diameter APPJs and offer insights for improving their design and control.

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