24
Nonlinear Theory
l
Important issues
–
Finite length of the beam pulse
–
Arbitrary value of
n
b
/ n
p
(n
b
>>n
p
)
–
2d
l
Approximations
–
Fluid approach,
–
Conservation of generalized vorticity
–
Long dense beams l
b
>> r
b
, V
b
/
w
p
l
Exact analytical solution