| Paper |
Title |
Page |
| TUPPH004 |
Study of Controllable Polarization SASE FEL using a Crossed-planar Undulator
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239 |
| |
- B. Faatz, W. Decking, Y. Li, J. Pflueger, E. Saldin, E. Schneidmiller, M. V. Yurkov
DESY, Hamburg
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Several methods to produce variable polarization have been under discussion for the European XFEL facility. One such method is to utilize a crossed-undulator scheme. In this paper, the polarization of X-ray radiation for longer wavelengths (0.4 nm and longer) of the XFEL is investigated. The degree of polarization and the Stokes parameters are calculated for different configurations. A first attempt at optimization of the configuration for XFEL parameters is presented.
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| TUPPH044 |
Investigation of Quadrupole Magnets for the XFEL Project Using a Rotating Coil Set-up
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345 |
| |
- F. Hellberg, H. Danared, A. Hedqvist
MSL, Stockholm
- Y. Holler, B. Krause, A. Petrov, J. Pflueger
DESY, Hamburg
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In the European X-ray free electron laser (XFEL) undulators quadrupole magnets focus the electron beam. The magnetic centre of these quadrupoles must be within 0.002 mm (rms) distance from a straight line over the length of an undulator. This can only be achieved with beam based alignment (BBA). For BBA to work, it is essential that changes of field strength do not significantly change the position of the magnetic centre of the quadrupole. Also, temperature stability of the position of the magnetic center is important. To investigate magnet excitation effects and sensitivity to temperature changes, a rotating coil system has been setup at the Manne Siegbahn Laboratory to measure the stability of the magnetic centre with accuracy better than 0.001 mm. This instrument was used to investigate the properties of several magnet yokes of different materials, solid and laminated, for the XFEL quadrupoles.
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| TUPPH047 |
A Permanent Magnet Phase Shifter for the European-XFEL
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356 |
| |
- H. H. Lu, D. Wang, M. T. Wang, J. Zhuang
IHEP Beijing, Beijing
- P. Neumann, J. Pflueger, M. Rueter, M. Tischer, T. Vielitz
DESY, Hamburg
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In undulator systems with variable gaps phase shifters are needed to exactly match the phase between individual segments so that constructive superposition of the emitted light occurs. A phase shifter based on Permanent Magnet technology for the use in the European XFEL has been developed and tested. This paper will explain its magnetic principle and focus on the applied correction schemes and the presentation of the final results.
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