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On the Schwinger limit attainability with extreme power lasers

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The scheme of<br />

interaction<br />

S. S. Bulanov, V. D. Mur, N. B. Narozhny, J. Nees, V. S. Popov, Phys. Rev. Lett. 104, 220404 (2010)<br />

Multiple Colliding EM pulses<br />

Near <strong>the</strong> origine<br />

in <strong>the</strong> <strong>limit</strong> N<br />

E e a cos( t) e 0.1 a k r z cos( t)<br />

Be z 0 0 r 0<br />

2<br />

0 0<br />

a0 k0rsin( 0t)<br />

8<br />

pulse<br />

∞<br />

electric and magnetic field<br />

can be approximated<br />

in cylindrical coordinates as :

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