Unformatted text preview: R ) is directed along the zaxis. The density of electrons across the beam is constant, but the momentum components transverse to the beam ( p x and p y ) are distributed evenly over a circle of radius p in momentum space. If some focusing system reduces the beam radius from R to R 1 , ﬁnd the resulting distribution of the transverse momentum components. What is the physical meaning of this result? (Consider the angular divergence of the beam). Relate your results to the “brightness theorem” of optics. 1...
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 Spring '11
 FERTIG
 Mass, Work

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