W. B. Colson, J. Blau, and D. Massey
Physics Department, Naval Postgraduate School, Monterey CA 93943 USA
There are few high gain free electron lasers for comparison to the proposed
x-ray LCLS FEL. While the early LLNL ELF experiments 15 years ago operated
at microwave wavelengths, it has many characteristics similar to the x-ray
LCLS. High gain experiments now underway in the infrared are intermediate
between microwave and x-ray wavelengths, but the extrapolation from
infrared to x-rays is the same extrapolation from microwaves to the infrared.
