Abstract
Alternative technique for linearizing the longitudinal phase space of an electron bunch formed via photoemission in an rf gun.
Highlights
Modern accelerators like free-electron lasers require ultrashort bunches on the femto-second scale
Apart from design considerations like a sufficient peak current, the bunch length determines the time resolution achievable with such light sources. The latter is true for electron sources built to carry out time-resolved electron diffraction experiments, like, for example, the Relativistic Electron Gun for Atomic Exploration, REGAE [1,2], located at DESY in Hamburg
The compression is limited by two factors: space charge repulsion and nonlinear phase space correlations
Summary
Modern accelerators like free-electron lasers require ultrashort bunches on the femto-second scale. The need for a different (shorter) rf wavelength in order to linearize the phase space curvature arises from the fact that the use of the same frequency would require to apply the same amplitude—and, the bunch would be completely decelerated. This is, only true if there is no evolution of the bunch in between the accelerating and the linearizing cavity. (It is, not limited to these two cases.) The analytic treatment is completed by a discussion of the longitudinal RMS emittance, which is a measure for the nonlinearities present in the phase space distribution of the bunch. An extensive feasibility study with tolerance analysis for the shortest bunches possible is beyond the scope
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