On the Schwinger limit attainability with extreme power lasers

Radiation friction effects (LAD):
Circularly Polarized v.s. Linearly Polarized
energy balance
a
2 2 2 6
0 e rad e
0
( 1)(1 ),
1
tan
1/
3
rad
3
rad e
radiation friction important at :
a
400, 23 2
i.e. at I 4.510 W/cm
quantum recoil important at :
a ( m c /
)
e
2 1/ 2
0
24 2
i.e. at I 410 W/cm
,
energy balance
mca= mc
+ 2 -
2 2
0 e 0
rad 0 e e
= 2r/ 10
rad
a
0
2
e
1
rad
8
radiation friction important at :
i.e. at E m c e E
2 4 3
3 e / 3 137 S
quantum recoil important at :
mci.e. a mc/
0. 21
2 2
m e e
e
i.e. at I 10
29
W/cm
2
0