Pradoong Suanpoot

Plasma Propagation Speed and Electron Temperature in Slow Electron Energy Non-thermal Atmospheric Pressure Indirect-Plasma Jet

Space- and time-resolved discharge-images from a nonthermal atmospheric-pressure indirect-plasma jet have been observed using a high-speed single-frame camera to investigate the electron temperature. The propagation velocity of the indirect Ar-plasma along the plasma column has been shown to be on the order of 104 m/s, and that corresponds to an ion acoustic velocity on the order of 102 m/s. Plasma has been generated by varying input discharge voltages from 2.0 to 4.0 kV at a driving frequency of 40 kHz. Particularly, the average electron temperature in slow electron energy nonthermal atmospheric-pressure indirect-plasma jet has been found to be about 0.3 eV.

Using plasma propagation speed model for investigation of electron temperature of AR/N2 in non-thermal atmospheric pressure indirect-plasma jet

Summary form only given. A high-speed single-frame ICCD camera has been used to observe a plasma propagation speed for electron temperature investigation. Space and time-resolved discharge images from a non-thermal atmospheric-pressure indirect path of bio-plasma jet are provided to measure group velocity (ug). The propagation velocity of the indirect Ar and mixture N2 (0-5%) plasmas along the plasma column has been shown to be in the order of 104 m/s, and that corresponds to an ion acoustic velocity (cs) in order of 102 m/s. Plasma has been generated by input discharge voltage of 3.0 kV at driving frequency of about 40 kHz. Particularly, there are two kinds of the electron, and it has been presented in atmospheric pressure non-thermal indirect-plasma jet. At slow electron energy, the average electron temperature has been found to be about 0.33 eV for Ar plasma and change to 0.42 eV for mixture Ar/N2 plasma. And regular electron energy, the average electron temperature has been found to be about 1.19 eV for Ar plasma and change to 1.40 eV for mixture Ar/N2 plasma. Implications of the results and directions for further studies are discussed.

Determination of electron-plasma temperature by measuring the propagation velocity of plasma-diffusion waves with the mixture gases of Ar-N 2 in the atmospheric pressure plasma jets

Summary form only given. From the measuring data of plasma jet propagation with ICCD camera, the determination method of the electron temperature is introduced. The bullet propagation has been analyzed by the plasma diffusion waves propagating with the group velocity of wave-packet as ug ~ cs2/un where cs is the velocity of acoustic wave and un is the velocity of plasma diffusion. The plasma-jet device is made by the syringe-needle electrode combined with the glass tube as it was introduced in [Cho G.S. et al, (2013)]. A high-voltage AC-power is supplied to the electrode of syringe needle through the ballast capacitor with the inverter of DC to AC of 40 kHz of 3.0 kV. The mixture gases of Ar and N2 are investigated with the flow late about 400 sccm. Ar-N2 Plasma Jet is one of the important issues in the applications of bio-medicine. The gases with the mixture ratio are used as: Ar(100%), Ar(98%) + Ne(2%) and Ar(95%) + Ne(5%), respectively. According to the mixture-ratio with ICCD, the group velocity of plasma propagation is observed as: 267 km/s, 305 km/s, and 313 km/s, respectively. The velocity of ion-acoustic wave is calculated to be 1.16 km/s, 1.24 km/s, and 1.25 km/s, respectively. The electron temperature is obtained as: 0.55 eV, 0.63 eV, and 0.65 eV, respectively.

Plasma propagation speed and electron temperature of ar in atmospheric pressure non-thermal indirect bioplasma jet

Space and time resolved discharge images from an atmospheric pressure non-thermal bioplasma jet have been observed by a high-speed single-frame camera to investigate the electron temperatures. The Ar plasma propagation speed with the group velocity in the plasma column of indirect plasma jet has been shown to beabout 120 km/s which corresponding with ion acoustic velocity of 0.8 km/s of plasma exposure atan input discharge voltage various from 1.99 - 4.09 kV and driving frequency of about 40 kHz. Particularly, the electron temperature in atmospheric pressure non-thermal indirect bioplasma jet were found to be about 0.55 eV of the early part of plasma exposure, respectively. Implications of the results and directions for further studies are discussed.

Plasma propagation speed and electron temperature of ar and N2 in atmospheric pressure non-thermal bioplasma jet

Summary form only given. Space and time resolved discharge images from an atmospheric pressure non-thermal bioplasma jet have been observed by a high-speed single-frame camera to investigate the electron temperatures. The Ar and Ar/N2 plasma propagation speed with the group velocity in the plasma column of jet has been shown to be about 3.4-4.8 km/s of the early part, and about 1.2-1.5 km/s of the late part of plasma exposure with an input discharge voltage of 3.0 kV and driving frequency of about 44 kHz. Particularly, the electron temperature in atmospheric pressure non-thermal bioplasma jet were found to be about 4.9-9.8 eV of the early part, and about 0.6-1.0 eV of the late part of plasma exposure, respectively. Implications of the results and directions for further studies are discussed.