| Paper | Title | Page |
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| MOPPH004 | Measurement and Analysis of CSR effects at FLASH | 18 |
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| The vacuum-ultra-violet Free Electron Laser in Hamburg (FLASH) is a linac driven SASE-FEL. High peak currents are produced using magnetic bunch compression chicanes. In these magnetic chicanes, the energy distribution along an electron bunch is changed by effects of Coherent Synchrotron Radiation (CSR). Energy changes in dispersive bunch compressor chicanes lead to transverse displacements along the bunch. These CSR induced displacements are studied using a transverse deflecting rf-structure. Recent experiments and simulations concerning the charge dependence of such transverse displacements are presented and analyzed. In these experiments an over-compression scheme is used which reduces the peak current downstream the bunch compressor chicanes. Therefore other self interactions like space charge forces which might complicate the measurements are suppressed. | ||
| TUPPH009 | SASE FEL Simulations for the European XFEL with the Codes Simplex and Genesis | |
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| Numerical simulation studies of the FEL process have been carried out for the European XFEL project. The impact of the undulator lattice quadrupole magnets misalignments on the FEL performance has been investigated using the FEL simulation codes SIMPLEX and GENESIS. The choice of the optimal beta function for the undulator has been investigated as well. The problem of the reduction of the number of quadrupole magnets in the undulator lattice is considered. | ||
| WEPPH038 | Low Power Consuming Hybrid Bending Magnet at the XFEL Beam Dump | 435 |
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At the end of the European XFEL the electron beam is separated from the photon beam and directed towards the beam dump with a bending magnet.* This dipole magnet is designed to bend 10-25 GeV electrons by 1 degree/m and is 10 meter long in total. By integrating permanent magnet material into a conventional electromagnet, this so called hybrid magnet with a 1 T bias magnetic field consumes no power at the nominal energy of the XFEL, 17.5 GeV. The magnetic field can be increased or decreased by magnet coils to obtain 1 degree/m deflection for all energies between 10 and 25 GeV. In case of component failures a passive safety system is needed to prevent the electron beam from reaching the experimental hall. The bias field of the permanent magnet not only saves power, but also works as a safety system for the XFEL. Here a proposal for such a hybrid configuration is presented together with its characteristics. The magnet is designed to use small amount of permanent magnet material and to consume less power than a conventional electromagnet.
*European XFEL Technical design report, edited by M. Altarelli et. al.,DESY 2006. |