Environmental Engineering Reference
In-Depth Information
Figure 3.18 Survey of plasma domains in
temperature
extended to higher temperatures, since some
metals, for example, W, Ta, andHf, are definitely
Fermi gases up to 1000 K¼0.08 eV. ([42] Figure
1.1).
density representation. Note that
temperatures are represented in eV units. In this
figure, the
metal plasma
region might be
-
so that a potential disturbance is shielded away in a distance
l
D
. The product
nl
D
3
,
denoted the plasma parameter, when large indicates that the average Coulomb
energy is small compared to kinetic energy, this is seen to apply in left portions of
Figure 3.18 to suns interior and to Tokomak plasma. If
n
1/3
is
r
, then in this regime
l
D
r
, so that screening does not occur. The strongly coupled plasma region is
nl
D
3
small, screening length short compared to mean interparticle distance, means
Coulomb energy is large compared to kinetic energy, applies to metals.