
65Defect-Induced Damage
Chapter 3
Porteusand Seitel, 1984; O’Connell, 1992; Krol etal., 2005; Gallais etal., 2004). We
will start with the description given by Foltyn (1984) for the degenerate ensemble (all
absorbers fail at the same uence) and later consider the case of a power-law ensemble
(Porteus and Seitel,1984).
In the case of illumination by a Gaussian spatial-energy distribution, F(r) = F
0
exp[−2(r/w)
2
], where F
0
is the maximum (axial) uence, and w is the beam radius at
the e
−2
level, the area A
th
of the beam with uence larger than threshold uence F
th
is
(Foltyn, 1984)
A
F
th
th
=
⎛
⎜
⎞
⎟
π
2
0
2
ln .
(3.48)
According to the Poisson stati ...