2015
DOI: 10.1134/s1063785015010071
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The role of the ambipolar field and the local approximation inapplicability in determination of the electron distribution function at high pressures

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Cited by 6 publications
(10 citation statements)
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“…Figure 9 shows the radial profiles of the excitation rate R r f r , d It can be seen that the excitation rate constants are not constant over the tube cross section, as they would be for the local D-D. For the case of σ m ∼ε −1/2 , the constant decreases with r and reaches a maximum on the discharge axis. For a growing cross section (argon, curve 2), both the reaction rate and its constant increase with r at the discharge center; as a result, their maxima are shifted toward the wall, as has been shown earlier [8][9][10][11][12]. For curves 3 and 4 in figure 9 that correspond to constant and descending cross sections, respectively, the maximum of the excitation constant is also shifted to the periphery, but not as pronounced as for curve 2.…”
Section: Resultssupporting
confidence: 52%
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“…Figure 9 shows the radial profiles of the excitation rate R r f r , d It can be seen that the excitation rate constants are not constant over the tube cross section, as they would be for the local D-D. For the case of σ m ∼ε −1/2 , the constant decreases with r and reaches a maximum on the discharge axis. For a growing cross section (argon, curve 2), both the reaction rate and its constant increase with r at the discharge center; as a result, their maxima are shifted toward the wall, as has been shown earlier [8][9][10][11][12]. For curves 3 and 4 in figure 9 that correspond to constant and descending cross sections, respectively, the maximum of the excitation constant is also shifted to the periphery, but not as pronounced as for curve 2.…”
Section: Resultssupporting
confidence: 52%
“…One manifestation of this fact is the complex spatial profiles of the excitation rates and their constants on the periphery of the plasma volume, as was described in [8][9][10][11][12][13][14][15] for PC in argon and nitrogen. We can write some expressions to estimate the reaction rates of inelastic processes.…”
Section: Resultsmentioning
confidence: 92%
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“…To apply the local approximation, the characteristic size of the discharge volume L (diffusion length) must exceed the electron energy relaxation length L , l e  and the value of the heating (longitudinal) field must be greater than the value of the ambipolar field: E E h a > [6][7][8][9]; that is, terms with spatial gradients in the kinetic equation can be ignored. Accordingly, use of local approximation is questionable at low and medium gas pressures when L l > e and the ambipolar field dominates at the plasma periphery, where E E a h > eventually.…”
Section: Introductionmentioning
confidence: 99%