Plasma technology manufacturers plasma single particle movement

• Categories:Industry News
• Author:plasma cleaning machine-surface treatment equipment-CRF plasma machine-Sing Fung Intelligent Manufacturing
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• Time of issue:2021-03-17
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(Summary description)The motion of single particle in plasma is mainly concerned with the motion of single charged particle in an external magnetic field. It is very simple for charged particles to move in a uniform, constant magnetic field. The constant velocity motion of a parallel field, and the constant velocity motion of a vertical field, is the circular motion about the magnetic field lines (Larmor circle), that is, the circumferential motion of a charged particle. If in addition to the magnetic field, there are other external forces F, the particle in addition to the vertical movement along the magnetic field, but also in two kinds of motion, the rotation and drift. Drift motion is when the center of a Larmor circle (the guiding center) moves perpendicular to the magnetic field. It can be caused by static electricity or gravity. In the case of non-uniform magnetic field, drift can also be caused by the magnetic field gradient and the curvature of the magnetic field. Static electricity causes an equal drift of positive and negative charges, so no current is generated. In contrast to the drift of positive and negative charges that do not produce static electricity, a current is generated. Because the magnetic field changes slowly in time and space, the particle motion can be thought of as a superposition of the cyclotron motion and the centrally guided motion. To simplify the problem, it is possible to consider only the motion of the center and not the fast circular motion, which is called the drift approximation. For the particle orbit theory, the drift approximation method is used to study the motion of particles. There are three adiabatic invariants in the slowly varying field. The more important one is that the magnetic moment of the particle is the velocity component perpendicular to the magnetic field B, and the mass is m. This property and the charge particle under the action of magnetic force to maintain the kinetic energy is limited to a certain shape of the uneven magnetic field. For example, the geomagnetic field can limit the radiation belts (Van Allen belts) that electrically charged particles form on Earth. Magnetic mirror devices controlled by thermonuclear fusion also use this property to limit plasma. The above is the introduction of CRF plasma technology manufacturers, I hope to help you.