Formation of multiple Double Layers in the presence of grounded ring in RF expanding plasma

P.K Saha,M Chakraborty,D Dutta,N Sharma,A Mukherjee

doi:10.1016/j.physleta.2023.129016

Formation of multiple Double Layers in the presence of grounded ring in RF expanding plasma

P.K Saha, M Chakraborty + Show 3 more

https://doi.org/10.1016/j.physleta.2023.129016

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Journal: Physics Letters A

Publication Date: Jul 13, 2023

Affiliation: Centre of Plasma Physics - Institute for Plasma Research

#Potential Drops #Plasma Potential Increases + Show 8 more

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Abstract

Multiple potential drops have been observed in the presence of a thick grounded ring when Argon plasma is allowed to expand in a Helicon Plasma Source (HeliPS) setup. Potential drops of 18 V and 11 V have been detected at 7 × 10−4 mBar working pressure and 500 G magnetic field in the expansion region of the setup. With the increase of working pressure, the potential drop decreases exponentially obeying Boltzmann's expansion rules. After both potential drops, the plasma potential increases again and forms a potential well like structure. This experimental study has been verified with Particle In Cell (PIC) computer simulation.

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