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Photon Pulse Filtering and Modulation Based On the Extreme Temporal Compression and Correlated Spread of the Electron Bunches in the SLAC Linac Coherent Light Source (LCLS)
The LCLS photon pulses are expected to attain unprecedented levels of
brightness and brevity in the 300-400eV range. Nominally, the photon
pulse length will be dominated by the electron bunch length, while the
performance of conventional x-ray reflecting and band-shaping optics
will be limited by: 1) peak power damage, and 2) transform-limited
monochromatization. In this paper we describe how: 1) the correlated
energy spread in the electron bunch can be used to selectably compress
the LCLS photon pulses to below their nominal length; 2) gas optics
can be used to mitigate peak damage problems; 3) the LCLS pulse
structure can, in principle, accommodate schemes based on "disposable"
optics; and 4) pulse lengthening schemes can be used to extend the
attainable degree of monochromatization.
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