The main goal of the book is to provide a systematic and
didactic approach to the physics and technology of free-electron
lasers. Numerous figures are used for illustrating the underlying
ideas and concepts and links to other fields of physics are
provided. After an introduction to undulator radiation and the
low-gain FEL, the one-dimensional theory of the high-gain FEL is
developed in a systematic way. Particular emphasis is put on
explaining and justifying the various assumptions and
approximations that are needed to obtain the differential and
integral equations governing the FEL dynamics. Analytical and
numerical solutions are presented and important FEL parameters are
defined, such as gain length, FEL bandwidth and saturation power.
One of the most important features of a high-gain FEL, the
formation of microbunches, is studied at length. The increase of
gain length due to beam energy spread, space charge forces, and
three-dimensional effects such as betatron oscillations and optical
diffraction is analyzed. The mechanism of Self-Amplified
Spontaneous Emission is described theoretically and illustrated
with numerous experimental results. Various methods of FEL seeding
by coherent external radiation are introduced, together with
experimental results. The world s first soft X-ray FEL, the user
facility FLASH at DESY, is described in some detail to give an
impression of the complexity of such an accelerator-based light
source. The last chapter is devoted to the new hard X-ray FELs
which generate extremely intense radiation in the Angstrom regime.
The appendices contain supplementary material and more involved
calculations."
General
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