Electric phenomena and magnetic phenomena are inseparable. The magnetic field affects the ionization balance and spatial distribution of the plasma. A new type of plasma discharges has been found in nitrogen at sub atmospheric pressure condition without external magnetic field. Because of its regular helical propagation pattern, it was called as helical plasma plume. Although a great deal of research has been carried out on the key characteristics of the helical plasma plume, the formation mechanism of it is still unclear, which affects its application in materials and nanotechnology. By applying magnetic field to helical plasma with different chirality, the regulation behavior of the external magnetic field on helical plasma is studied. It is found that the external magnetic field will make the helical plasma shrink or stretch. With the increase of the magnetic field intensity from 0mT to 200mT, the left-handedness helical plasma plume stretches under the magnetic field of S-pole. Conversely, the left-handedness chiral helical plasma plume contracts when the magnetic poles change to N-pole. However, when the chirality of helical plasma plume is changed to right-handedness by adjusting voltage, opposite phenomenon comparing to the previous one is observed. Moreover, the applied magnetic field also affects the divergence of helical plasma. With the increase of S-pole external magnetic field, the helical plasma plume stretches until the external magnetic field reach to 80mT. When the magnetic field intensity is 80mT, the helical plasma disappears. The plasma in the quartz tube appears as a divergent form. Then increase the magnetic field intensity to 160mT, and the plasma appears in the form of a helix again. Finally, in the process of changing the intensity of the magnetic field, the clarity of the helical plasma plume will also change. The radial electric field of helical plasma is calculated by electromagnetic wave theory, and the mechanism of the influence of external magnetic field on the behavior of helical plasma is clarified. It is found that the magnetic field force component of Lorentz force is the reason that external magnetic field regulates the behavior of helical plasma. This study lays a theoretical foundation for understanding the motion behavior of helical plasma, which is conducive to the practical application in the field of materials and nanotechnology.
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