Appendix C 527
Dreicer runaway electric field (p.395)
EDreicer=5. 6 × 10 −^18 neZ
lnΛ
Te
V/m.
Typical neutral cross-section (p.16)
σneut∼ 3 × 10 −^20 m^2
Warm plasma waves
Electrostatic susceptibility (p.165)
χσ=
1
k^2 λ^2 Dσ
[1+αZ(α)]
whereα=ω/kvTσ
Plasma dispersion function (p.165)
Z(α) =
1
π^1 /^2
∫∞
−∞
dξ
exp(−ξ^2 )
(ξ−α)
lim
α<< 1
Z(α) = − 2 α
(
1 −
2 α^2
3
+...
)
+iπ^1 /^2 exp(−α^2 )
lim
α>> 1
Z(α) = −
1
α
[
1+
1
2 α^2
+
3
4 α^4
+...
]
+iπ^1 /^2 exp(−α^2 )