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abstract:
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The requirements on the phase and amplitude jitter of the photoinjector laser in teh LCLS are very stringent. These can be eased if the incoherent energy spread in the beam is increased, decreasing the sensitivity of the bunch compression process. There are few good ways of increasing the incoherent, as opposed to the coherent, energy spread, which can be easily increased by rephasing the rf, or by space charge. A radiative or a collisional process must be used to increase the incoherent energy spread, in order to make the energy change independent of phase. Here we examine the feasibility of using the back-scattering of photons from an intense, one picosecond laser beam. We assume that we can use a laser beam (1047 nm wavelength, Nd:YLF), chosen to allow it to drive both the cathode (after quadrupling), and the longitudinal phase space degrader.
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