| Measurements Of Plasma Wake-Fields In The Blow-Out Regime (2007) | |||||||||||||
Abstract | |||||||||||||
| this paper have used the code NOVO [9], which solves the Maxwell equations, assuming that this solution is unchanging in a frame moving with the beam. The plasma electrons are assumed to behave like a cold fluid and are modeled with the Maxwell-Boltzman equation. We have added a beam model to this code which tracks a set of super-particles, consistent with the NOVO picture [8]. This contradicts the assumption that the fields are static in the beam's frame, but this discrepancy is not very large, if we can assure that the beam changes very slowly compared to a plasma oscillation ( k p >> 1 b ). A similar argument is used with spatial variations in the plasma density. In the most extreme case, the beam crosses a plasma/vacuum boundary, with the method and have been incorporated into the code. causing a transient response, which is neglected in our treatment. More gradual variations in the plasma density, like the droop at the ends of the column, are entirely consistent. | |||||||||||||
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