KHz Atmospheric Pressure Plasma Jets

kHz Jet
kHz Jet
Capillary jets operated in the kHz range produce relatively long plasma jets, which appear continuous to the naked eye, but on micro-second timescales are actually pulsed. The figure shows a photograph of a cylindrical dielectric barrier discharge jet. The discharge configuration consists of a glass tube with internal diameter 4 mm and thickness 1 mm. Tubular copper electrodes surround the glass tube and are driven at 20 kHz.
Plasma Bullets
Plasma Bullets
The figure above shows time resolved ICCD images of the plasma jet emitted from the cylindrical dielectric barrier discharge jet illustrating individual plasma pulses on a nano-second timescale. The jet is operated in helium and the images are taken for a camera gate of 20 ns and delay of 40 ns between images.