The FEL field has grown enormously over the last years, which is
reflected in the number of papers presented at the 1998 conference.
A few specific areas in FEL are particularly active. Several groups
are investigating self-amplified spontaneous emission (SASE) as a
route to 0.1 nm FEL. Although the technical challenges are large, a
growing portion of the community believes this is a feasible goal
and have begun planning 4th generation light sources based on this
technique. Already, demonstrations of SASE by many orders of
magnitude in an unguided (by external means) optical mode have been
achieved in the IR with extension into the UV soon to follow. Other
groups are extending the applications of FELs by evolutionary
changes in the capabilities of user facilities around the world.
Many of these utilize other sources of radiation synchronously with
tunable FEL beams. An emerging trend is th use of Thompson
scattered photons from the electron beam. Because of the Doppler
shift involved, the photons can be up-scattered into the X-ray
(keV) or even gamma ray (MeV) regime forming a useful picosecond
probe for analysis of materials or nuclear structure. Other groups
continue to extend the range of FEL operation and a new record was
set this year for short wavelength lasing (210nm) as well as
production of the highest CW average power yet for a FEL (311 W).
This exhaustive volume will provide the reader with an
appreciation of the state of FEL technology and convey also the
sense of excitement and interest that exists in the field. Despite
the fact that it has been 22 years since the first demonstration of
lasing in a FEL oscillator, the field continues to provide
interesting areas for study and application.
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