Monday, July 27, 2009, 4:00 pm — Large Conference Room, Bldg. 911B
The possibility to control optical frequency current shot-noise by longitudinal collective Coulomb interaction in an electron beam was suggested by us recently, based on an extended 1D (single Langmuir mode) model[1,2]. This model predicts the possibility to reduce the beam current-noise below the classical shot-noise level. However it was expected, that at certain limits, 3D interaction effects may compromise the efficiency of the process. We executed 3D simulations with GPT in order to verify the predicted current shot noise reduction. The numerical simulations demonstrated current shot-noise reduction, which, as predicted, attains its minimal value at a drift-length of quarter plasma wavelength oscillation. In order to avoid 3D deterioration effects (interference of higher order Langmuir modes) the attainment of the new suggested effect requires proper setting of the beam geometrical and current density parameters. The parameters range in which the single mode model is valid were identified, and parameters for future experiments are suggested. The implication of this noise control process for overcoming micro-bunching instabilities and attaining temporally-coherent seeded FELs are considered.
5650 | INT/EXT | Events Calendar
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