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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >The role of the electrical polarization field in magnetic plasma confinement
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The role of the electrical polarization field in magnetic plasma confinement

机译：极化场在磁等离子体约束中的作用

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摘要

The radial expansion of an axially flowing plasma column in a constant axial magnetic field is considered for the following cases: (a) magnetized electrons and unmagnetized ions, and (b) magnetized electrons and partially magnetized ions. In case (a), radially escaping ions produce a radial electric polarization field. For a directed axial ion velocity of upsilon(0) = 1.5 x 10(4) m s(-1), particle concentration n(0) = 10(18) m(-3) and magnetic field B = 0.02 T, the azimuthal electron drift velocity in the crossed electric and magnetic fields is 4 x 10(5) m s(-1), i.e. near to their thermal velocity with T-e = 3 x 10(4) K: rootkT(e)/m(e) approximate to 5 x 10(5) m s(-1) and it together with the thermal velocity determines the electron collision frequency. With a neutral gas pressure of 1.3 Pa and a magnetic field strength of B = 0.01 T, the radial electron velocity reaches the radial ion expansion velocity within a time of less than or equal to8 x R/upsilon(0), where R is the plasma column radius. If the ions are partially magnetized, the electric polarization field is caused by radially escaping unmagnetized ions, while the electrons, and magnetized ions drift in the crossed electric, and magnetic field. The, thermal, and axially directed ion velocities are much less than their azimuthal drift velocity, and thus the azimuthal velocity determines the collision frequency. [References: 20]
机译：在以下情况下，考虑轴向流动的等离子柱在恒定轴向磁场中的径向膨胀：（a）磁化的电子和未磁化的离子，以及（b）磁化的电子和部分磁化的离子。在情况（a）中，径向逃逸的离子会产生径向极化电场。对于upsilon（0）= 1.5 x 10（4）ms（-1）的定向轴向离子速度，粒子浓度n（0）= 10（18）m（-3）且磁场B = 0.02 T，方位角交叉电场和磁场中的电子漂移速度为4 x 10（5）ms（-1），即接近它们的热速度，Te = 3 x 10（4）K：根kT（e）/ m（e）近似到5 x 10（5）ms（-1）并与热速度一起确定电子碰撞频率。在1.3 Pa的中性气压和B = 0.01 T的磁场强度下，径向电子速度在小于或等于8 x R / upsilon（0）的时间内达到径向离子膨胀速度，其中R为等离子柱半径。如果离子被部分磁化，则极化场由径向逃逸的未磁化离子引起，而电子和磁化离子在交叉的电场和磁场中漂移。热离子和轴向离子的速度远小于其方位角漂移速度，因此，方位角速度决定了碰撞频率。 [参考：20]

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