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abstract:
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High power microwave sources at X-Band, delivering
400 to 500 of megawatts for about 400 ns, have been
recently developed. These sources can power a
microwave undulator with short period and large gap, and
can be used in short wavelength FELs reaching the nm
region at a beam energy of about 1 GeV. We present here
an experiment designed to demonstrate that microwave
undulators have the field quality needed for high gain
FELs. compensate RF power losses, it might be convenient to
have an open waveguide geometry, as will be discussed
later in the paper. However the initial FEL calculations
are based on a circular cross-section waveguide.
The undulator is powered by two transverse electric
modes, shifted in the time phase by
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