5-1. The electron-neutral collision cross section for 2-eV electrons in He is about 6wao, where ao = 0.53 x 10* cm is the radius of the first Bohr orbit of the hydrogen atom. A positive column with no magnetic field has p = 1 Torr of He (at room temperature) and KT. = 2 eV. %3D (a) Compute the electron diffusion coefficient in m/sec, assuming that ou averaged over the velocity distribution is equal to or for 2-eV electrons. (b) If the current density along column is 2 kA/m and the plasma density is 10 m, what is the electric fiekd along the column?
5-1. The electron-neutral collision cross section for 2-eV electrons in He is about 6wao, where ao = 0.53 x 10* cm is the radius of the first Bohr orbit of the hydrogen atom. A positive column with no magnetic field has p = 1 Torr of He (at room temperature) and KT. = 2 eV. %3D (a) Compute the electron diffusion coefficient in m/sec, assuming that ou averaged over the velocity distribution is equal to or for 2-eV electrons. (b) If the current density along column is 2 kA/m and the plasma density is 10 m, what is the electric fiekd along the column?
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Transcribed Image Text:5-1. The electron-neutral collision cross section for 2-eV electrons in He is about
6rab, where ao =0.53 x 10 cm is the radius of the first Bohr orbit of the
hydrogen atom. A positive column with no magnetic feld has p = 1 Torr of
He (at room temperature) and KT, = 2 eV.
%3D
(a) Compute the electron diffusion coefficient in m/sec, assuming that o
averaged over the velocity distribution is equal to ou for 2-eV electrons..
(b) If the current density along column is 2 kA/m and the plasma density is
10 m, what is the electric field along the colurnn?
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