The plasma–sheath transition in low temperature plasmas: on the existence of a collisionally modified Bohm criterion
The plasma–sheath transition in low temperature plasmas: on the existence of a collisionally modified Bohm criterion
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低温等离子体中的等离子体鞘转变:关于碰撞修正玻姆准则的存在
DOI:
10.1088/0022-3727/44/4/042002
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发表时间:
2011
期刊:
影响因子:
--
通讯作者:
R.P. Brinkmann
中科院分区:
文献类型:
--
作者:
R.P. Brinkmann
The plasma–sheath transition in stationary low temperature plasmas is investigated for arbitrary levels of collisionality. The model under study contains the equations of continuity and motion for a single ion species, Boltzmann's equilibrium for the electrons and Poisson's equation for the field. Assuming that the electron Debye length λ D is small compared with the ion gradient length l= n i/(∂ n i/∂ x), a first order differential equation is established for the ion density n i as a function of the transformed spatial coordinate q=∫ n i dx. A characteristic feature of this novel sheath equation is an internal singularity of the saddle point type which separates the depletion-field dominated sheath part of the solution from the ambipolar diffusion-controlled plasma. The properties of this singularity allow us to define, in a nonarbitrary way, a collisionally modified Bohm criterion which recovers Bohm's original expression in the collisionless limit but also remains meaningful when collisions are included.
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