Abstract
The idea to use a long linear accelerator (linac) for providing the drive beam for an X-ray free-electron laser was conceived at the Stanford Linear Accelerator Center SLAC. In the Linac Coherent Light Source LCLS (see Chap. 9) a 1 km long section of the SLAC electron linac, which has been the major facility for elementary particle physics at Stanford since 1965, delivers the beam needed in the FEL.
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Notes
- 1.
We consider here the normalized emittance, see Sect. 8.9.
- 2.
This applies if one neglects a small second-order correction to the beam transfer matrix of the chicane.
- 3.
In a beam pipe of arbitrary cross section, which is kept invariant along the axis, the field pattern will be more complicated than in a round pipe, but wake field effects are still absent if the resistance of the wall vanishes and the particles are ultra-relativistic.
- 4.
The bunch form factor may have zeroes in the upper half of the complex \(\tilde{\omega }\) plane which lead to singularities of \(\ln [F(\tilde{\omega })]\) and contribute additional terms to the right-hand side of Eq. (8.12). These contributions are not experimentally accessible. For a further discussion see [30].
- 5.
It should be noted that also the TDS data suffer from ambiguities, the reconstructed shape depends on the streak direction. A possible explanation is that the particles possess a non-vanishing average slope \(\langle y'(\zeta ) \rangle \) in streak direction which varies along the bunch axis. The resulting shape errors cancel when taking the average of the TDS measurements with positive and negative streak direction.
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Schmüser, P., Dohlus, M., Rossbach, J., Behrens, C. (2014). The EUV and Soft X-Ray FEL in Hamburg. In: Free-Electron Lasers in the Ultraviolet and X-Ray Regime. Springer Tracts in Modern Physics, vol 258. Springer, Cham. https://doi.org/10.1007/978-3-319-04081-3_8
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