| Paper | Title | Page |
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| MOBAU02 | Results and Lessons from FLASH | 23 |
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| Since first lasing beginning of 2005, we have continuously extended the wavelength range and improve the performance of FLASH. With regular blocks of accelerator and FEL studies and user beam time, we have now covered a wavelength range between 13 and 45 nm, at power levels between 5 and 50 μJ. Depending on user demands, we have delivered single bunch or multiply bunches at repetition rates of 1 MHz or 250 kHz. The latest results of the machine performance will be shown. In addition, the specific problems that have been encountered and our solutions during the past 18 months will be discussed. Finally, future plans for FLASH will be presented. | ||
| MOPPH050 | The Properties of the FEL Output for Different Seeding Schemes | 150 |
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| Several seeding schemes, like self seeding for FLASH or seeded HGHG cascades for BESSY soft X-ray FEL, are proposed for existing or planned free electron laser facilities. The simulation of these schemes requires the detailed knowledge of the properties of the seeding radiation and the implementation of these properties in the Codes. Time dependent simulations with the 3D code GENESIS calculate the electric field distribution in and at the end of the undulator. The physical optics code PHASE permits the propagation of wave fronts across grazing incidence optics. Using the combination GENESIS PHASE GENESIS, the properties of the FEL output for different seeding schemes can be obtained. For example, the radiation quality of a SASE FEL can be improved in a self seeding scheme. Here, the radiation is monochromatized after a first undulator section and reflected back to the second Undulator modules. We present simulation studies for the self seeding option of FLASH. | ||
| MOPPH053 | Simulation Studies on the Self-Seeding Option at FLASH | 162 |
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In order to improve the temporal coherence of the radiation generated by FLASH, a two-stage seeding scheme* is presently being realized. It consists of two undulator stages and a magnetic chicane and a monochromator located between them. In this contribution we investigate various configurations of the electron optics of the seeding set-up. The optimization of the lattice in the first seeding stage and the parameters of the magnetic chicane will be discussed. Simulation results for the performance of the seeded FEL at different resonant wavelengths will be presented.
* J. Feldhaus et. al. "Possible application of X-ray optical elements for reducing the spectral bandwidth of an X-ray SASE FEL". Optics Communications, Volume 140, Pages 341-352 |