Linearization of the Longitudinal Phase Space without Higher Harmonic Field
| Autor: | Florian Grüner, Klaus Floettmann, Benno Zeitler |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: |
Physics
Nuclear and High Energy Physics Physics and Astronomy (miscellaneous) Field (physics) business.industry Surfaces and Interfaces Electron Beam optics Physics::Classical Physics Computer Science::Other Optics Nuclear magnetic resonance Linearization Condensed Matter::Superconductivity Phase space Harmonic lcsh:QC770-798 Physics::Accelerator Physics lcsh:Nuclear and particle physics. Atomic energy. Radioactivity Condensed Matter::Strongly Correlated Electrons ddc:530 business Electron gun |
| Zdroj: | Physical review accelerators and beams 18(12), 120102 (2015). doi:10.1103/PhysRevSTAB.18.120102 Physical Review Special Topics. Accelerators and Beams, Vol 18, Iss 12, p 120102 (2015) |
| Popis: | Accelerator applications like free-electron lasers, time-resolved electron diffraction, and advanced accelerator concepts like plasma acceleration desire bunches of ever shorter longitudinal extent. However, apart from space charge repulsion, the internal bunch structure and its development along the beam line can limit the achievable compression due to nonlinear phase space correlations. In order to improve such a limited longitudinal focus, a correction by properly linearizing the phase space is required. At large scale facilities like Flash at Desy or the European Xfel, a higher harmonic cavity is installed for this purpose. In this paper, another method is described and evaluated: Expanding the beam after the electron source enables a higher order correction of the longitudinal focus by a subsequent accelerating cavity which is operated at the same frequency as the electron gun. The elaboration of this idea presented here is based on a ballistic bunching scheme, but can be extended to bunch compression based on magnetic chicanes. The core of this article is an analytic model describing this approach, which is verified by simulations, predicting possible bunch length below 1 fs at low bunch charge. Minimizing the energy spread down to σ_{E}/E |
| Databáze: | OpenAIRE |
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