19th ICFA Beam Dynamics Workshop on Physics of, and Science with, the X-Ray Free-Electron Laser

Name: 19th ICFA Beam Dynamics Workshop on Physics of, and Science with, the X-Ray Free-Electron Laser

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Created at: Fri Jul 27 23:53:34 -0700 2007

Updated at: Fri Jul 27 23:53:34 -0700 2007

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2 papers from the conference:

title:	Optimization of an X-ray SASE FEL
format:	conference procceeding
conference:	19th ICFA Beam Dynamics Workshop on Physics of, and Science with, the X-Ray Free-Electron Laser
year:	2001
7 authors:	C. Pellegrini | S. Reiche | J. Rosenzweig | C. Schroeder | A. Varfolomeev | S. Tolmachev | H.-D. Nuhn
abstract:	The most important characteristics of an X-ray SASE-FEL are determined by the electron beam energy, transverse and longitudinal emittance, and by choice of the undulator period, field, and gap. Among them are the gain and saturation length, the amount and spectral characteristics of the spontaneous radiation, the wake fields due to the vacuum pipe. The spontaneous radiation intensity is very large in all X-ray SASE-FELs now being designed, and it contributes to the final electron beam energy spread, thus affecting the gain. It also produces a large background for the beam and radiation diagnostics instrumentation. The wake fields due to the resistivity and roughness of the beam pipe through the undulator, also affects the beam 6-dimensional phase space volume, and thus the gain and the line width. In this paper, we discuss ways to optimize the FEL when considering all these effects. In particular we consider and discuss the use of a hybrid iron-permanent magnet helical undulator to minimize some of these effects, and thus optimize the FEL design.
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title:	Beam collimation for LCLS beam emittance and charge control
format:	conference procceeding
conference:	19th ICFA Beam Dynamics Workshop on Physics of, and Science with, the X-Ray Free-Electron Laser
year:	2001
3 authors:	C. B. Schroeder | Nuhn, H. D. | C. Pellegrini
abstract:	We describe an electron beam collimator for the linac coherent light source (LCLS). The collimator reduces both the transverse emittance and the total charge of the electron beam. Beam optics are designed to increase the beam spot size for collimation. The impedance of the collimator is calculated, and the wakefield induced emittance growth is determined. (12 References).
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