Effect of magnetic field on double layer in argon helicon plasma

Abstract

The electric double layer in argon helicon plasma by using floating electrostatic probe and local optical emission spectroscopy under different external magnetic field was investigated. Results show that electrons generated in the plasma source can be magnetized by the magnetic field and transported by the gradient of diverging magnetic field in the diffusion chamber, giving rise to the hollowed distribution of electron temperature. The electron temperature on axis has a sudden decrease, leading to the sudden decrease of plasma density as well as the plasma potential, forming a double layer structure. The position of double layer moves along with the position of diverging magnetic field, and the potential drop increases along with the strength of magnetic field. The structure of the external magnetic field plays the decisive factor for the double layer in helicon plasma.

Metastable Helium Atom Creation Dynamics in High-Voltage Pulsed Discharge with Transverse Magnetic Field Effects

“…The topic of research on the con nement of high-temperature plasma by the magnetic eld nowadays is still of great interest to scholars worldwide. [7][8][9][10]. The in uence of the magnetic eld on low-temperature plasma of various types of gas discharges has also been studied no less actively in the past and now [1,[11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29].…”