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Suppression of Current Shot Noise and of Spontaneous Radiation Emission in Electron Beams by Collective Coulomb Interaction

Suppression of Current Shot Noise and of Spontaneous Radiation Emission in Electron Beams by Collective Coulomb Interaction,10.1109/TPS.2011.2162853,I

Suppression of Current Shot Noise and of Spontaneous Radiation Emission in Electron Beams by Collective Coulomb Interaction  
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The effect of current-shot-noise suppression in an electron beam (e-beam) and the corresponding process of charged-particle self-ordering are analyzed using an analytic 1-D model and verified by 3-D numerical simulations. The suppression of current shot noise can be utilized to enhance the coherence of seeded free-electron lasers (FELs) and any other radiation devices using an e-beam. It is shown that this can be attained at optical frequencies with state-of-the-art high-quality e-beams. Our analysis of spontaneous emission suppression results in fun- damental theoretical limit expressions for the coherence of FELs and other coherent radiation devices, which is analogous to the Schawlow-Townes limit. After exceeding the shot-noise limit, the coherence of FEL radiation is limited in the IR by velocity noise due to the e-beam energy spread. At UV and shorter wavelengths, it is fundamentally limited by quantum noise.
Journal: IEEE Transactions on Plasma Science - IEEE TRANS PLASMA SCI , vol. 39, no. 10, pp. 2033-2038, 2011
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