由于定向分子束中分子密度远高于周围等离子体密度,沿磁力线两侧进入分子束区域的电子因非弹性碰撞失去部分能量和动量,引起分子束区的电子堆积,形成静电双层,其屏蔽效应是分子束可以较深透入等离子体的主要机制.%When a dense molecular beam injects perpendicularly into a tokamak plasma, the background electrons enter into molecular beam along the magnetic field lines would encounter a series of inelastic collisions, result in energy and momentum losses. This will induce an accumulation of electrons near the boundary of the molecular beam and form a double layer, its shielding effect makes the molecular beam penetrating longer distance.
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