Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
The colour map shows the factor of reduction of the divergence, as a function of the electron energy and of the distance L between the accelerator and the lens. The peak electron density in the focusing stage is ∼3.9 × 1018 cm−3.
