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Title |
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| MOPPH050 |
The Properties of the FEL Output for Different Seeding Schemes
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150 |
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- J. Bahrdt
BESSY GmbH, Berlin
- B. Faatz, R. Treusch
DESY, Hamburg
- V. Miltchev
Uni HH, Hamburg
- R. Reininger
New Affiliation Request Pending, -TBS-
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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.
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