解 Poisson方程 e egp VΦ kT ex 4兀E。r akt noe
11 解Poisson方程 = − = − − e q k T n e e 1 exp 0 0 0 2 exp( ) 4 1 0 D r r Q = − 2 0 2 0 n e kTe D =
德拜长度的快速估算 D 6.9 Debye length in cm T in k no in cm 12
12 0 6.9 n Te D = 德拜长度的快速估算 Debye Length in cm Te in k n0 in cm-3
研究对象尺寸要求 保持等离子体电中性L>λD 13
13 研究对象尺寸要求 保持等离子体电中性 L D
典型的德拜长度 Electron Densit Magnetic Debye Plasma temperature Field Length T(K) BT Solar core 1032 10 10-11 Tokamak 1020 10 10-4 Gas discharge 1016 10 Ionosphere 1012 10 10-5 10- Magnetosphere 10 107 102 Solar wind 10 10-9 10 Interstellar medium 10 104 10 10 Intergalactic 10 medium httpen.wikipediaorg_/wiki/debye_lengthdebyelengthinsilicon 14
14 典型的德拜长度 Plasma Densit ne (m-3 ) Electron temperature T(K) Magnetic Field B(T) Debye Length λD (m) Solar core 1032 107 -- 10−11 Tokamak 1020 108 10 10−4 Gas discharge 1016 104 -- 10−4 Ionosphere 1012 103 10−5 10−3 Magnetosphere 107 107 10−8 102 Solar wind 106 105 10−9 10 Interstellar medium 105 104 10−10 10 Intergalactic medium 1 106 -- 105 http://en.wikipedia.org/wiki/Debye_length#Debye_length_in_silicon
Debye length vs spacecraft SI pacecralt potential 光电子效应产生的电荷
15 Debye length vs spacecraft ◼ Spacecraft potential 光电子效应产生的电荷