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The group "Experimental Physics II - Reactive Plasmas" at the faculty of physics and astronomy at Ruhr University Bochum.

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Intra-cavity dynamics in a microplasma channel by side-on imaging

Here, a microplasma channel was investigated. The setup consists of three stacked layers: a magnet, a dielectric foil and two nickel foils that are separated by a 120 μm wide gap. The magnet is grounded while the two nickel foils are powered. The setup was operated with a triangular voltage with a frequency of 10 kHz and an amplitude of up to 700 V in Helium at atmospheric pressure. Phase resolved emission images were used to investigate the microplasma channel dynamics with line of sight from the top and from the side to the inside of the cavity. The top view images revealed that the discharge in the microplasma channel and the microplasma arrays behave similar. The already known asymmetric discharge behavior, the self-pulsing and the wavelike ignition was also observed in the microplasma channel. For the wavelike ignition in the channel a simple one dimensional model was proposed. With the additional side view images the asymmetric discharge behavior was examined more thoroughly. Unlike in the microplasma arrays, the discharge expands here in both half periods of the applied voltage above the upper edge of the powered electrodes. The discharge extends over a larger width in the half period, in which the potential of the upper electrodes is increasing, while it extends over a larger height in the other half period. Phase resolved images were also used to investigate the ignition phase of the discharge. The discharge ignites in the two half periods on a different height. This was explained by modeling the drift and diffusion of the charged particles between two discharge pulses.

Release Date
Permanent Identifier (URI)
Is supplementing
Plasma Source Name
Plasma Source Application
Plasma Source Specification
Plasma Source Properties
up to 1,4 kVpp, 10 kHz, triangular voltage
English (United States)
Plasma Source Procedure
Before each measurement the setup was heated to 50°C for 20 min and a cold trap (dry ice) was used to reduce impurities.
Plasma Medium Name
Plasma Medium Properties
0,5 slm Helium 5.0
Plasma Medium Procedure
Before each measurement the setup was heated to 50°C for 20 min and a cold trap (dry ice) was used to reduce impurities.
Contact Name
Simon Kreuznacht
Contact Email
Plasma Diagnostic Properties
Andor iStar DH334T-18U-73 and Andor iStar DH334T-18UE3
Public Access Level
Plasma Diagnostic Name
Funding Agency

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